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	<title>Derek McCormick's Violin Blog</title>
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	<description>Making a violin and other violin-related topics</description>
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		<title>Derek McCormick's Violin Blog</title>
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		<item>
		<title>Set-up</title>
		<link>http://derekmccormick.wordpress.com/2009/11/15/set-up/</link>
		<comments>http://derekmccormick.wordpress.com/2009/11/15/set-up/#comments</comments>
		<pubDate>Sun, 15 Nov 2009 18:46:15 +0000</pubDate>
		<dc:creator>derekmccormick</dc:creator>
				<category><![CDATA[(18) Set-up]]></category>
		<category><![CDATA[(19) Set-up]]></category>

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		<description><![CDATA[<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=derekmccormick.wordpress.com&amp;blog=3027868&amp;post=938&amp;subd=derekmccormick&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p style="text-align:center;">
<div id="attachment_939" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-939 " title="Fingerboard" src="http://derekmccormick.files.wordpress.com/2009/11/fingerboard.jpg?w=600&#038;h=450" alt="Fingerboard" width="600" height="450" /><p class="wp-caption-text">First thing after varnishing is to refit the fingerboard. It may look like the fingerboard that was fitted for temporary set-up, but it has now been modified to reduce it&#39;s weight. The scooped area on the undersurface of the overhang has been extended and the thickness reduced.</p></div>
<div id="attachment_940" class="wp-caption aligncenter" style="width: 810px"><img class="size-medium wp-image-946 " title="Pegfit" src="http://derekmccormick.files.wordpress.com/2009/11/pegfit1.jpg?w=800&#038;h=300" alt="Pegfit" width="800" height="300" /><p class="wp-caption-text">I am now fitting a set of ebony Hill pattern pegs using the tool previously described in &quot;Temporary Set-up&quot;.  When they are fitted with the correct projection on the thumb grip side they stick out beyond the pegbox on the other side. They are reduced to be almost flush with the pegbox wall before being rounded and polished. I make tiny pin pricks to identify the pegs so that they can be replaced in the correct holes if they are removed at any time e.g. for string changing, peg lubrication etc. (I picked up this tip from the late Wilf Saunders). For the photo I have emphasised the pin pricks with fine chalk dust and they can be seen on the &quot;E&quot; and &quot;A&quot; pegs in the right hand picture.</p></div>
<div id="attachment_952" class="wp-caption aligncenter" style="width: 460px"><a href="http://derekmccormick.files.wordpress.com/2009/11/conor.jpg"><img class="size-medium wp-image-952 " title="Conor" src="http://derekmccormick.files.wordpress.com/2009/11/conor.jpg?w=450&#038;h=600" alt="" width="450" height="600" /></a><p class="wp-caption-text">The final touches have now been added - an Aubert bridge, a handmade ebony tailpiece from Bois d&#39;Harmonie and an ebony chinrest. The player of course has to be happy with the instrument before finally purchasing it,  so Conor has been &quot;road testing&quot; the fiddle around some of the traditional musical venues of Belfast (mostly pubs!). This has given him the opportunity to get to know it  and also to let others play it so that he can hear it as a listener, rather than &quot;under the ear&quot;. I am glad to say that he is very pleased with it and tomorrow is heading off  with it for a three-gig tour in Switzerland with the Irish traditional music band Craobh Rua.</p></div>
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			<media:title type="html">Fingerboard</media:title>
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			<media:title type="html">Pegfit</media:title>
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			<media:title type="html">Conor</media:title>
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		<item>
		<title>VARNISHING</title>
		<link>http://derekmccormick.wordpress.com/2009/10/13/varnishing/</link>
		<comments>http://derekmccormick.wordpress.com/2009/10/13/varnishing/#comments</comments>
		<pubDate>Tue, 13 Oct 2009 14:25:59 +0000</pubDate>
		<dc:creator>derekmccormick</dc:creator>
				<category><![CDATA[(18) Varnishing]]></category>

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		<description><![CDATA[The varnishing process continues with successive coats being applied with a gentle rub-down between layers. However, the composition of each coat is not the same. The major components of my varnish are pine resin  and linseed oil, and I get this from Northern Renaissance Instruments who make it by hand in their premises near Manchester. [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=derekmccormick.wordpress.com&amp;blog=3027868&amp;post=910&amp;subd=derekmccormick&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<div id="attachment_909" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-916 " title="Materials" src="http://derekmccormick.files.wordpress.com/2009/10/materials1.jpg?w=600&#038;h=800" alt="Materials" width="600" height="800" /><p class="wp-caption-text">These are some of the materias used in &quot;varnishing&quot;. Technically the process is not really varnishing - it is more akin to the classical method of oil painting. The wood is first treated with a primer and &quot;ground&quot;. This is followed by a sealer which prevents the later colour layers from infiltrating the wood. Then a series of coloured coats are applied. These consist of pigments suspended in a resin/oil varnish, so this is technically paint rather than varnish. Finally, after all the colour layers, a coat of clear varnish is applied over the surface. The brushes that I use are in the foreground. The broad brush with dark hair is used on the front and back. The narrower, slightly stiffer brush is used on the scroll and ribs (it is also a different &quot;filbert&quot; shape).</p></div>
<div id="attachment_918" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-918  " title="ID PII" src="http://derekmccormick.files.wordpress.com/2009/10/id-pii2.jpg?w=600&#038;h=304" alt="xxc" width="600" height="304" /><p class="wp-caption-text">Here I have removed the fingerboard and replaced it with a thin piece of wood to avoid damage to the delicate edges of the neck. The primer (Imprimatura Dorata from Magister) has been applied. </p></div>
<div id="attachment_913" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-913 " title="UV" src="http://derekmccormick.files.wordpress.com/2009/10/uv1.jpg?w=600&#038;h=450" alt="The vioin" width="600" height="450" /><p class="wp-caption-text">If I lived in Italy I would now hang the violin in the sun for a few days! In this climate I resort to my UV box to enhance the colour of the wood and primer. (The box noramlly has the lid closed. For obvious reasons I took this photo with my eyes closed!!)</p></div>
<div id="attachment_924" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-924 " title="Pumice copy" src="http://derekmccormick.files.wordpress.com/2009/10/pumice-copy.jpg?w=600&#038;h=150" alt="asdgf" width="600" height="150" /><p class="wp-caption-text">In the next stage I will be rubbing a paste of pumice onto the wood.  Pumice is a porous volcanic rock which is available in powder form and I start by mixing it with clear varnish and mulling it to ensure fine particle size and to suspend it evenly in the varnish. After scooping it into a jar with a palette knife I apply it by using a cloth &quot;rubber&quot;. </p></div>
<div id="attachment_926" class="wp-caption aligncenter" style="width: 460px"><img class="size-medium wp-image-926 " title="Pigment mulling" src="http://derekmccormick.files.wordpress.com/2009/10/pigment-mulling.jpg?w=450&#038;h=600" alt="asdf" width="450" height="600" /><p class="wp-caption-text">Another mulling session - this time I am using the pigment Cinquasia Gold. This will be added to the varnish (plus some Gilsonite) to colour the varnish in subsequent steps.</p></div>
<div id="attachment_927" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-927  " title="Rubbing" src="http://derekmccormick.files.wordpress.com/2009/10/rubbing.jpg?w=600&#038;h=450" alt="as" width="600" height="450" /><p class="wp-caption-text">Several coats of varnish have now been applied.  After each coat dries it is rubbed down with very fine micromesh abrasive lubricated with water and Marseilles soap. </p></div>
<p>The varnishing process continues with successive coats being applied with a gentle rub-down between layers. However, the composition of each coat is not the same. The major components of my varnish are pine resin  and linseed oil, and I get this from Northern Renaissance Instruments who make it by hand in their premises near Manchester. Before using it I add pigments and turpentine.  Each coat of varnish has a slightly different oil:resin ratio. The first coat has a ratio of 0.9:1.0 and the proportion of oil is gradually increased with each successive coat until the final coats have an oil:resin ratio of 1.5:1.0. As a result of this, the lower coats of varnish are quite stiff and the upper coats are considerably softer and more elastic.</p>
<p>When the final coat has bee applied I leave the instrument for about a week before rubbing down with progressively finer micromesh abrasives.  The final polishing process will come later when everything is ready for final set-up. I aim for a soft sheen  rather than a high gloss lacquer-like finish.</p>
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			<media:title type="html">Materials</media:title>
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			<media:title type="html">ID PII</media:title>
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			<media:title type="html">UV</media:title>
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			<media:title type="html">Pigment mulling</media:title>
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			<media:title type="html">Rubbing</media:title>
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		<item>
		<title>Temporary Set-up</title>
		<link>http://derekmccormick.wordpress.com/2009/08/25/temporary-set-up/</link>
		<comments>http://derekmccormick.wordpress.com/2009/08/25/temporary-set-up/#comments</comments>
		<pubDate>Tue, 25 Aug 2009 09:22:11 +0000</pubDate>
		<dc:creator>derekmccormick</dc:creator>
				<category><![CDATA[(17) Temporary Set-up]]></category>

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		<description><![CDATA[<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=derekmccormick.wordpress.com&amp;blog=3027868&amp;post=896&amp;subd=derekmccormick&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p style="text-align:center;">
<div id="attachment_898" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-898" title="DSCF2475" src="http://derekmccormick.files.wordpress.com/2009/08/dscf24751.jpg?w=600&#038;h=450" alt="DSCF2475" width="600" height="450" /><p class="wp-caption-text">The pilot holes for the pegs were drilled at an earlier stage and now I am using a tapered reamer to open the holes ready for fitting the pegs.</p></div>
<div id="attachment_899" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-899" title="DSCF2479" src="http://derekmccormick.files.wordpress.com/2009/08/dscf2479.jpg?w=600&#038;h=450" alt="DSCF2479" width="600" height="450" /><p class="wp-caption-text">The pegs are now shaved down using a tool like a pencil sharpener. It puts a taper on the pegs that matches the taper in the peg hole. I am putting these old pegs in as a temporary measure to allow me to set the violin up &quot;in the white&quot;. I will fit the final pegs when the player has chosen them.</p></div>
<div id="attachment_902" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-902" title="DSCF2480" src="http://derekmccormick.files.wordpress.com/2009/08/dscf2480.jpg?w=600&#038;h=450" alt="DSCF2480" width="600" height="450" /><p class="wp-caption-text">The pegs have been fitted, the soundpost installed and the instrument has been strung up with a temporary bridge and tailpiece. The player will now have the opportunity to check out the &quot;feel&quot; of the violin and small adjustments to properties  such as the neck profile can be made at this stage. </p></div>
<div id="attachment_904" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-904" title="DSCF2503" src="http://derekmccormick.files.wordpress.com/2009/08/dscf2503.jpg?w=600&#038;h=450" alt="DSCF2503" width="600" height="450" /><p class="wp-caption-text">I generally set the neck width at the nut at 24mm. This is a fairly standard measurement but some players like it a bit narrower. Conor has checked the violin with its temporary set-up  and would prefer the neck width slightly reduced.  I will take the neck width down to give a nut width of about 23mm and the instrument will then be stripped down, the fingerboard removed and preparations for varnishing will begin. </p></div>
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		<title>Fitting the Neck</title>
		<link>http://derekmccormick.wordpress.com/2009/08/11/fitting-the-neck/</link>
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		<pubDate>Tue, 11 Aug 2009 16:49:08 +0000</pubDate>
		<dc:creator>derekmccormick</dc:creator>
				<category><![CDATA[(16) Fitting the Neck]]></category>

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		<description><![CDATA[<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=derekmccormick.wordpress.com&amp;blog=3027868&amp;post=884&amp;subd=derekmccormick&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<div id="attachment_885" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-885" title="DSCF2419" src="http://derekmccormick.files.wordpress.com/2009/08/dscf24191.jpg?w=600&#038;h=450" alt="DSCF2419" width="600" height="450" /><p class="wp-caption-text">Before fitting the neck I will complete the edges, firstly by filing a series of bevels.</p></div>
<div id="attachment_887" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-887" title="Rounded edges" src="http://derekmccormick.files.wordpress.com/2009/08/rounded-edges2.jpg?w=600&#038;h=594" alt="Rounded edges" width="600" height="594" /><p class="wp-caption-text">The bevels are then merged to form the rounded edge.</p></div>
<div id="attachment_889" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-889" title="DSCF2410" src="http://derekmccormick.files.wordpress.com/2009/08/dscf24102.jpg?w=600&#038;h=450" alt="DSCF2410" width="600" height="450" /><p class="wp-caption-text">The mortice is cut and ready to receive the neck. It is deliberately undersized and at theis stage the neck will not slip fully home into the body (see next photo).</p></div>
<div id="attachment_890" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-890" title="DSCF2411" src="http://derekmccormick.files.wordpress.com/2009/08/dscf24113.jpg?w=600&#038;h=450" alt="DSCF2411" width="600" height="450" /><p class="wp-caption-text">At this stage the neck does not fit fully into the body but by gradually enlarging the mortice it will slip into place. During this process there are a number of important measurements and relationships which must be maintained. These include the distance from nut to edge of body (130mm) the overstand of the neck where it meets the body (6.0-6.5mm) and the angle at which the fingerboard projects on the bridge. In addition, the fingerboard must be orientated  precisely along the central axis and there must be no lateral rotation of the neck.</p></div>
<div id="attachment_891" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-891" title="DSCF2464" src="http://derekmccormick.files.wordpress.com/2009/08/dscf2464.jpg?w=600&#038;h=450" alt="DSCF2464" width="600" height="450" /><p class="wp-caption-text">When all of the above criteria have been fulfilled the neck can be glued in position using strong freshly made hide glue. It is clamped securely using a G-clamp and and a leather-lined wooden block shaped to conform to the curvature of the fingerboard.</p></div>
<div id="attachment_892" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-892" title="DSCF2469" src="http://derekmccormick.files.wordpress.com/2009/08/dscf2469.jpg?w=600&#038;h=450" alt="DSCF2469" width="600" height="450" /><p class="wp-caption-text">I am beginning to form the button and to shape the shoulder of the neck using a chisel followed by a knife. Final shaping will involve rasps and scrapers. </p></div>
<p style="text-align:center;">
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			<media:title type="html">derekmccormick</media:title>
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		<media:content url="http://derekmccormick.files.wordpress.com/2009/08/dscf24191.jpg?w=300" medium="image">
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			<media:title type="html">Rounded edges</media:title>
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			<media:title type="html">DSCF2469</media:title>
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		<title>Neck and Fingerboard</title>
		<link>http://derekmccormick.wordpress.com/2009/07/24/neck-and-fingerboard/</link>
		<comments>http://derekmccormick.wordpress.com/2009/07/24/neck-and-fingerboard/#comments</comments>
		<pubDate>Fri, 24 Jul 2009 19:26:48 +0000</pubDate>
		<dc:creator>derekmccormick</dc:creator>
				<category><![CDATA[(15) Neck and Fingerboard]]></category>

		<guid isPermaLink="false">http://derekmccormick.wordpress.com/?p=835</guid>
		<description><![CDATA[<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=derekmccormick.wordpress.com&amp;blog=3027868&amp;post=835&amp;subd=derekmccormick&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<div id="attachment_836" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-836" title="01" src="http://derekmccormick.files.wordpress.com/2009/07/01.jpg?w=600&#038;h=450" alt="01" width="600" height="450" /><p class="wp-caption-text">I start with a part-finished ebony blank. It is much too thick so the first thing to do is to thin it down a bit. I put it in a home made jig and plane off the excee thickness. It is also too wide so after this I plane the sides (using a &quot;shooting board&quot;) until I have 24mm width at the narrow end and 42 mm at the wide end. I check the thickness at the edges and if it is more than about 4.5mm I return it to the jig and plane a bit more off it.</p></div>
<div id="attachment_837" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-837" title="02" src="http://derekmccormick.files.wordpress.com/2009/07/02.jpg?w=600&#038;h=450" alt="02" width="600" height="450" /><p class="wp-caption-text">The fingerboard is glued onto the neck. It will be removed later before varnishing so  I use just three dabs of fairly weak hide glue. </p></div>
<div id="attachment_852" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-852" title="03" src="http://derekmccormick.files.wordpress.com/2009/07/03.jpg?w=600&#038;h=450" alt="03" width="600" height="450" /><p class="wp-caption-text">It is now time to remove the excess wood from the sides of the block. I make a series of saw cuts stopping just short of the fingerboard. I use a Japanese saw for most sawing operations. Unlike European saws it cuts on the &quot;pull&quot; stroke rather than the &quot;push&quot; and it can therefore be made much thinner. </p></div>
<div id="attachment_853" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-853" title="04" src="http://derekmccormick.files.wordpress.com/2009/07/04.jpg?w=600&#038;h=450" alt="04" width="600" height="450" /><p class="wp-caption-text">The excess wood can then be removed between the saw cuts with a chisel, cutting away from the fingerboard to avoid the risk of damaging the ebony. An engineer&#39;s type vice is really useful when working with the neck/scroll - a couple of pieces of cork are lightly glued inside the jaws. </p></div>
<div id="attachment_860" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-860" title="05" src="http://derekmccormick.files.wordpress.com/2009/07/05.jpg?w=600&#038;h=450" alt="05" width="600" height="450" /><p class="wp-caption-text">I have started shaping the neck by rasping off corners. Rasp and files will be used to continue the shaping.</p></div>
<div id="attachment_861" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-861" title="06" src="http://derekmccormick.files.wordpress.com/2009/07/06.jpg?w=600&#038;h=450" alt="06" width="600" height="450" /><p class="wp-caption-text">Planing the sides of the neck root which will be morticed into the violin body.</p></div>
<div id="attachment_862" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-862 " title="07" src="http://derekmccormick.files.wordpress.com/2009/07/07.jpg?w=600&#038;h=450" alt="07" width="600" height="450" /><p class="wp-caption-text">Marking out the neck root. &quot;A&quot; is the overstand above the front. &quot;B&quot; is the thickness of the front and &quot;C&quot; is the rib depth at the point of insertion of the neck. These marks will be used as guidesd when fitting the neck. The hatched area will be gradually removed as the neck is fitted.</p></div>
<div id="attachment_863" class="wp-caption aligncenter" style="width: 460px"><img class="size-medium wp-image-863" title="08" src="http://derekmccormick.files.wordpress.com/2009/07/08.jpg?w=450&#038;h=600" alt="08" width="450" height="600" /><p class="wp-caption-text">The neck and heel of the pegbox are almost finshed and will be finalized when the neck is attached to the body. Shaping of the neck root will also be carried out at that time.</p></div>
<p style="text-align:center;">
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			<media:title type="html">01</media:title>
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			<media:title type="html">03</media:title>
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			<media:title type="html">04</media:title>
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			<media:title type="html">06</media:title>
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			<media:title type="html">08</media:title>
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		<title>Scroll and Pegbox</title>
		<link>http://derekmccormick.wordpress.com/2009/07/18/scroll-and-pegbox/</link>
		<comments>http://derekmccormick.wordpress.com/2009/07/18/scroll-and-pegbox/#comments</comments>
		<pubDate>Sat, 18 Jul 2009 18:18:32 +0000</pubDate>
		<dc:creator>derekmccormick</dc:creator>
				<category><![CDATA[(14) Scroll and Pegbox]]></category>

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		<description><![CDATA[<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=derekmccormick.wordpress.com&amp;blog=3027868&amp;post=817&amp;subd=derekmccormick&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<div id="attachment_818" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-818" title="Scroll01" src="http://derekmccormick.files.wordpress.com/2009/07/scroll013.jpg?w=600&#038;h=312" alt="Scroll01" width="600" height="312" /><p class="wp-caption-text">Using a template, I have drawn the outline of the scroll, pegbox and neck on a nice piece of well-figured maple. The position of the pegholes is also marked.</p></div>
<div id="attachment_819" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-819" title="Scroll02" src="http://derekmccormick.files.wordpress.com/2009/07/scroll022.jpg?w=600&#038;h=450" alt="Scroll02" width="600" height="450" /><p class="wp-caption-text">I am cutting out the shape, keeping the bandsaw blade just outside the line (and my thumb well away from the blade).</p></div>
<div id="attachment_820" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-820 " title="Scroll03" src="http://derekmccormick.files.wordpress.com/2009/07/scroll033.jpg?w=600&#038;h=330" alt="Scroll03" width="600" height="330" /><p class="wp-caption-text">The scroll, pegbox and neck have been released from the block. The pegholes have also been drilled and will be taken to their final size with a reamer at a later stage. I will use rasps and files to bring the shape down to the final outline.</p></div>
<div id="attachment_824" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-824" title="Scroll04" src="http://derekmccormick.files.wordpress.com/2009/07/scroll042.jpg?w=600&#038;h=390" alt="Scroll04" width="600" height="390" /><p class="wp-caption-text">Apologies for the focus! I have marked the outline of the neck, pegbox and scroll and will now stat to develop the shape using gouges and chisels.</p></div>
<div id="attachment_827" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-827" title="Scroll07" src="http://derekmccormick.files.wordpress.com/2009/07/scroll071.jpg?w=600&#038;h=450" alt="Scroll07" width="600" height="450" /><p class="wp-caption-text">The sides of the pegbox have now been established using chisels and gouges around the curved heel. Next step will be to rough out the spiral curves of the volute.</p></div>
<div id="attachment_828" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-828" title="Scroll11 copy" src="http://derekmccormick.files.wordpress.com/2009/07/scroll11-copy.jpg?w=600&#038;h=418" alt="Scroll11 copy" width="600" height="418" /><p class="wp-caption-text">Careful sawcuts (I use a Japanese &quot;pull&quot; saw) are made at a tangent to the scroll curves and down to the line marking the edge of the scroll. Waste wood is taken off with a chisel to leave a a square enclosing the first turn of the volute. The reamining excess wood is taken off with gouges which fit the curve as closely as possible.</p></div>
<div id="attachment_829" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-829" title="Scroll12" src="http://derekmccormick.files.wordpress.com/2009/07/scroll12.jpg?w=600&#038;h=450" alt="Scroll12" width="600" height="450" /><p class="wp-caption-text">By continuing the same process as in the previous picture I have arrived at this stage. Its still pretty rough, but its beginning to look like a scroll and it will be considerably refined later.</p></div>
<div id="attachment_830" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-830" title="Gouges" src="http://derekmccormick.files.wordpress.com/2009/07/gouges.jpg?w=600&#038;h=450" alt="Gouges" width="600" height="450" /><p class="wp-caption-text">These are the gouges that have been used in taking the scroll to this stage.</p></div>
<div id="attachment_840" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-840" title="DSCF2377" src="http://derekmccormick.files.wordpress.com/2009/07/dscf2377.jpg?w=600&#038;h=450" alt="DSCF2377" width="600" height="450" /><p class="wp-caption-text">Hollowing out the pegbox using a gouge sharpened on the inside of the curve and pushing it forward with a rotatory motion. Final finishing will be with riffler files and chisels. The pencil line is the the depth that I must not exceed!!</p></div>
<div id="attachment_844" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-844" title="DSCF2380" src="http://derekmccormick.files.wordpress.com/2009/07/dscf2380.jpg?w=600&#038;h=450" alt="DSCF2380" width="600" height="450" /><p class="wp-caption-text">The chamfer has been put on the edge of the scroll and pegbox and I am starting to to form the fluting. I make two initial gouge tracks on each side which will then be merged before finishing with scrapers.</p></div>
<div id="attachment_846" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-846" title="DSCF2383" src="http://derekmccormick.files.wordpress.com/2009/07/dscf2383.jpg?w=600&#038;h=450" alt="DSCF2383" width="600" height="450" /><p class="wp-caption-text">Fluting is completed and now I just need to tidy up the whole scroll and pegbox with scrapers.</p></div>
<div id="attachment_847" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-847" title="DSCF2385" src="http://derekmccormick.files.wordpress.com/2009/07/dscf2385.jpg?w=600&#038;h=450" alt="DSCF2385" width="600" height="450" /><p class="wp-caption-text">These are the scrapers I have used in finishing the scroll and pegbox. The next step will be fitting the fingerboard and shaping the neck.</p></div>
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		<title>Closing the body</title>
		<link>http://derekmccormick.wordpress.com/2009/05/13/closing-the-body/</link>
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		<pubDate>Wed, 13 May 2009 20:01:43 +0000</pubDate>
		<dc:creator>derekmccormick</dc:creator>
				<category><![CDATA[(13) Closing the Body]]></category>

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		<description><![CDATA[TAP TONES Before fixing the front to the rest of the body I check the &#8220;tap tones&#8221;. Every piece of wood (or any other material) has natural modes of vibration when they are stimulated by tones. The modes of vibration of a violin front can be determined by holding the front at specific points (nodes) [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=derekmccormick.wordpress.com&amp;blog=3027868&amp;post=775&amp;subd=derekmccormick&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p><strong>TAP TONES</strong> Before fixing the front to the rest of the body I check the &#8220;tap tones&#8221;. Every piece of wood (or any other material) has natural modes of vibration when they are stimulated by tones. The modes of vibration of a violin front can be determined by holding the front at specific points (nodes) and tapping at other spcific points (antinodes). The frequency of the generated sound can be measured either by ear (by comparing with tones of known frequency) or by using a computer program (which is much easier). Three modes of vibration (#1,#2 and #5) are of special to violinmakers because they are related to stiffness  across and along the grain respectively and reppd represent the bending and twisting motions of the front when the violin is played. This allow the maker to have some control over the characteristics of the front.  By shaving off some wood inside the front or on the bass bar we can alter the mode frequency in a predictable way. There is more than one view on the value of &#8220;tap tones&#8221; to the maker and I remain an agnostic because the behaviour of the finished instrument is enormously more complex than the vibration of an isolated front. However, it is easy to do and if I gather enough data who knows &#8211; I may find a relationship between &#8220;tap tones&#8221; and particular tonal characteristics.</p>
<p style="text-align:center;">
<div id="attachment_780" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-798" title="Screenshot" src="http://derekmccormick.files.wordpress.com/2009/05/screenshot.jpg?w=600&#038;h=370" alt="Screenshot" width="600" height="370" /><p class="wp-caption-text">Here I have used a program called CoolEdit to record and analyse three taps placed so as to elicit mode #2. I have selected an area (white bar) and analysed the frequencies present in the sound. You can  see in the insert that there is a major peak followed by a series of lesser peaks of decreasing amplitude and increasing frequency. Mode #2 of this front is 137Hz. I make a note of this figure together wih the values for #1 and #5 for future reference. I also record the weight of the front (65gm).</p></div>
<div id="attachment_781" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-781  " title="Closed" src="http://derekmccormick.files.wordpress.com/2009/05/closed.jpg?w=600&#038;h=450" alt="Closed" width="600" height="450" /><p class="wp-caption-text">The front is glued on using thinner hide glue than was used for the back. </p></div>
<div id="attachment_793" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-793" title="DSCF2102" src="http://derekmccormick.files.wordpress.com/2009/05/dscf2102.jpg?w=600&#038;h=450" alt="DSCF2102" width="600" height="450" /><p class="wp-caption-text">The body is now complete and only needs a bit of refinement of the edges. Next step the scroll/pegbox/neck.</p></div>
<p style="text-align:center;">
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			<media:title type="html">Closed</media:title>
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		<title>The Bass Bar</title>
		<link>http://derekmccormick.wordpress.com/2009/05/11/the-bass-bar/</link>
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		<pubDate>Mon, 11 May 2009 12:06:23 +0000</pubDate>
		<dc:creator>derekmccormick</dc:creator>
				<category><![CDATA[(12) The Bass Bar]]></category>

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		<description><![CDATA[<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=derekmccormick.wordpress.com&amp;blog=3027868&amp;post=760&amp;subd=derekmccormick&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<div id="attachment_763" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-763 " title="Splitting bass bar" src="http://derekmccormick.files.wordpress.com/2009/05/splitting-bass-bar.jpg?w=600&#038;h=224" alt="Splitting bass bar" width="600" height="224" /><p class="wp-caption-text">The bass bar is important both structurally and acoustically. A piece of spruce is split rather than sawn. This is to ensure that the grain runs straight along the complete length of the bar. The split piece is then planed down to about 5.5mm in this case.</p></div>
<div id="attachment_764" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-764" title="Bass bar 2" src="http://derekmccormick.files.wordpress.com/2009/05/bass-bar-2.jpg?w=600&#038;h=450" alt="Bass bar 2" width="600" height="450" /><p class="wp-caption-text">For fitting, the front is clamped into a frame which holds it without distortion.  The bas bar will run along the bass side of the front, running under the position of the bridge foot almost but not quite parallel to the centre join.  It is important to get really good contact between the lower surface of the bar and the belly. Using the unshaped bar as a guide a series of little blocks is glued in place so that the bar can always be placed in the same position as I begin to shape it. This is done by chalk fitting. The area where the bar is to be sited is chalked and when the rough bar is put in place and very slightly moved longitudinally. Where the bar is touching it will be marked with the chalk and these high points are removed by knife or small plane. This process is repeated and gradually more and more of the bar is chalked. Finally when the whole bar is marked (and therefore in good contact) you breathe a sigh of relief, open a can and heat up the glue! For me at least bass bar fitting is not one of the most exciting episodes in making a violin!</p></div>
<p style="text-align:center;">
<div id="attachment_767" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-767" title="Bassbar 6" src="http://derekmccormick.files.wordpress.com/2009/05/bassbar-6.jpg?w=600&#038;h=224" alt="Bassbar 6" width="600" height="224" /><p class="wp-caption-text">The bar has been glued in position and left overnight. After removing the locating blocks the bar is ready to be taken to its final shape.</p></div>
<div id="attachment_768" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-768 " title="Bass bar 5" src="http://derekmccormick.files.wordpress.com/2009/05/bass-bar-5.jpg?w=600&#038;h=450" alt="Bass bar 5" width="600" height="450" /><p class="wp-caption-text">The bar has now arrived at its final shape using a small plane and scraper.  It is now 270mm long, 13mm at the high point, tapering down to 3mm at the ends. In cross section it is tapered from the 5.5mm base to give an arch-shaped profile.</p></div>
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			<media:title type="html">Splitting bass bar</media:title>
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			<media:title type="html">Bass bar 2</media:title>
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			<media:title type="html">Bassbar 6</media:title>
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		<title>The f-holes</title>
		<link>http://derekmccormick.wordpress.com/2009/04/30/f-holes/</link>
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		<pubDate>Thu, 30 Apr 2009 09:38:44 +0000</pubDate>
		<dc:creator>derekmccormick</dc:creator>
				<category><![CDATA[(11) The f-holes]]></category>

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		<description><![CDATA[<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=derekmccormick.wordpress.com&amp;blog=3027868&amp;post=740&amp;subd=derekmccormick&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<div id="attachment_741" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-741 " title="dscf2041" src="http://derekmccormick.files.wordpress.com/2009/04/dscf2041.jpg?w=600&#038;h=450" alt="I have now finished arching and thicknessing the front and the purfling has been fitted. " width="600" height="450" /><p class="wp-caption-text">I have now finished arching, purfling and thicknessing the front. These procedures are identical to the treatment of the back except that the front is more even in thickness. Most of the front is 2.4-2.6mm thick with slightly thicker areas arond the position of the f-holes. The area which will support the soundpost is also left thicker (3mm) to give added strength. In this slightly bizarre photo I am holding the front against the light to demonstrate the translucence of the spruce.</p></div>
<p style="text-align:center;">
<div id="attachment_742" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-742 " title="dscf2043" src="http://derekmccormick.files.wordpress.com/2009/04/dscf2043.jpg?w=600&#038;h=450" alt="I have now used a couple of special tools to cut the finials at each end of the f-holes. These cutting tools remove little wooden discs as seen in the picture. The pencil lines seen on the inside of the front" width="600" height="450" /><p class="wp-caption-text">I have now used a couple of special tools to cut the finials at each end of the f-holes. These cutting tools remove little wooden discs as seen in the picture. The pencil lines seen on the inside of the front are guides for placement of the f-holes. </p></div>
<div id="attachment_743" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-743" title="f-finials" src="http://derekmccormick.files.wordpress.com/2009/04/f-finials.jpg?w=600&#038;h=450" alt="f-finials" width="600" height="450" /><p class="wp-caption-text">I have now drawn the f-holes on the outside using a cardboard template, with the holes as guides.</p></div>
<p style="text-align:center;">
<div id="attachment_744" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-744" title="sawn-f" src="http://derekmccormick.files.wordpress.com/2009/04/sawn-f.jpg?w=600&#038;h=450" alt="sawn-f" width="600" height="450" /><p class="wp-caption-text">Using a fret saw with a very fine blade I have cut out the body of the f-holes keeping well clear of the guide lines.</p></div>
<div id="attachment_745" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-745" title="f-knife" src="http://derekmccormick.files.wordpress.com/2009/04/f-knife.jpg?w=600&#038;h=450" alt="f-knife" width="600" height="450" /><p class="wp-caption-text">Geting to the final outline of the f-holes with a fine-bladed knife used from the inside.</p></div>
<div id="attachment_747" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-747" title="dscf2075" src="http://derekmccormick.files.wordpress.com/2009/04/dscf2075.jpg?w=600&#038;h=450" alt="dscf2075" width="600" height="450" /><p class="wp-caption-text">The f-holes have now been completed. The poster behind the front is a photograph of the origninal Guarneri instrument on which my violin is based.</p></div>
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		<title>Jointing the Front</title>
		<link>http://derekmccormick.wordpress.com/2009/04/07/jointing-the-front/</link>
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		<pubDate>Tue, 07 Apr 2009 22:18:31 +0000</pubDate>
		<dc:creator>derekmccormick</dc:creator>
				<category><![CDATA[(10) Jointing the Front]]></category>

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		<description><![CDATA[<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=derekmccormick.wordpress.com&amp;blog=3027868&amp;post=709&amp;subd=derekmccormick&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<div id="attachment_710" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-710" title="front" src="http://derekmccormick.files.wordpress.com/2009/03/front.jpg?w=600&#038;h=450" alt="front" width="600" height="450" /><p class="wp-caption-text">This is the spruce which I will use for the front. When cut from the log it ws a single wedge-shaped piece which was sawn lengthwise and opened like a book.  Like all my wood I got this at Bertrand Michaud&#39;s sawmill (le Bois de Lutherie) in eastern France.  This wood was harvested at least 15 years ago when the sawmill was at La Chapelle-sur-Furiuse (his stamp is on the wood), before his move to Fertans.  It is a  beautiful piece of fine-grained spruce with about 170 years growth at high altitude in the Jura mountains.</p></div>
<div id="attachment_711" class="wp-caption aligncenter" style="width: 910px"><img class="size-medium wp-image-711  " title="planing-collage" src="http://derekmccormick.files.wordpress.com/2009/03/planing-collage.jpg?w=900&#038;h=336" alt="planing-collage" width="900" height="336" /><p class="wp-caption-text">The first stage of joining these pieces is to plane the jointing surfaces absolutely flat and at 90 degrees to the lower surface. For this I use my Lie-Nielsen plane and a &quot;shooting board&quot;. It is very enjoyable to work with a good plane and a well-honed iron - the long ribbons of shavings roll off the wood as thin and transparent as onion skin! It is vital that these two pieces of wood will meet perfectly along the whole length and width of the joint. In the finished violin the wood will be less than 3mm thick along the length of the join, so any tiny gaps could obviously have disastrous consequences.</p></div>
<div id="attachment_712" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-712 " title="joint02" src="http://derekmccormick.files.wordpress.com/2009/03/joint02.jpg?w=600&#038;h=450" alt="joint02" width="600" height="450" /><p class="wp-caption-text">The jointing method that I employ is centuries old and is known as a &quot;rubbed joint&quot;. One piece of the front is held in a vice and freshly made hot hide glue is brushed over the surface. The second piece is set carefully on top and slid firmly lengthwise  back and forward. After a few seconds you can feel an increased resistance as the glue begins to &quot;grab&quot;. This is the time to stop and leave it overnight.</p></div>
<div id="attachment_731" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-731" title="resin-pocket" src="http://derekmccormick.files.wordpress.com/2009/03/resin-pocket.jpg?w=600&#038;h=450" alt="resin-pocket" width="600" height="450" /><p class="wp-caption-text">After jointing I planed down both surfaces and came across a resin pocket. Theyt are not uncommon and there is no way of suspecting their presence. At any rate they are not a problem and often they disppear during subsequent carving. Sometimes they persist but they are easily removed and repaired without tonal or aesthetic detriment. Stradivari found one when he was making his celebrated &quot;Messiah&quot; violin and if you look carefully at photographs (or the original in the Ashmolean Museum) you can see his repair on the upper treble bout of the front. In the present case the pocket is less than 1cm long and not very deep so it will probably disappear as I arch the front. </p></div>
<p style="text-align:center;">
<div id="attachment_714" class="wp-caption aligncenter" style="width: 610px"><img class="size-medium wp-image-714" title="front01" src="http://derekmccormick.files.wordpress.com/2009/03/front01.jpg?w=600&#038;h=450" alt="front01" width="600" height="450" /><p class="wp-caption-text">My bandsaw has fairly narrow &quot;throat&quot; so I have to se a sort of &quot;jigsaw&quot; technique to saw the outline of the front.</p></div>
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