HURDY GURDY
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The finished instrument. 3 strings with trompette, chromatic keyboard, birdseye maple. The sound is loud and bright.
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I based my design loosely on this beautiful photo.
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I was attempting to build a small travel instrument that still had 345mm chanter, trompette and chromatic keyboard.
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Since I was having difficulty bending the tail end on the bending pipe, I used a form to get the precise shape.
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100_3882.jpg 2004-11-29
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All bracing is spruce except for these 2 critical braces which are maple.
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The wheel is made of laminated maple. Bearings are delrin and are force fit into a brass insert.
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Bearing sleeves are glued into oversize holes in the instrument while the bearings and shaft are inserted.
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The shaft, wheel flange, rear collar and crank parts were made by Buck Lumbert http://www.lumbert.net/
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Gluing on the top. There are never enough clamps!
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The wheel slot is cut first and then the top is glued on.
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The top is easily trimmed useing a table router and edge trimmer.
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100_4801.jpg 2005-04-03
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The difficult keybox slots were cut using a bandsaw.
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Here you can see how the keybox sides were constructed from 3 pieces.
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The peghead was constructed from 4 pieces.
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Simple butt joints are used to join the tuning head to the keybox.
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3/4 size violin tuning pegs were used.
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The lower keys were constructed from 2 or 3 separate pieces of maple.
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There are 3 different widths of keyshafts. The lower 6 are wide and the top 3 upper keys are narrow.
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The upper keys. The keyfronts are made from a single piece of walnut.
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Here are the glue and finishes I used. The light stain was used to enhance the birdseye maple pattern.
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Tru-Oil is an easy to use and forgiving finish. Rub it on and then lightly buff, then sand lightly between coats.
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I used 5 coats on most parts
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There is a short string length from dog to tail so a small riser was used at the tail to decrease the downward angle.
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The keytails are decorated by using 35 degree angles sanded on disk sander.
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The distance from tangent to trompette varies from 2mm at the low end to 5mm in the middle to 4mm at the high end.
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If you look close you'll see that the light colored backing behind the red felt varies in thickness.
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Chantrelle .95mm gut. Trompette .95mm gut. Bourdon 1.55mm gut. (I hope to have a wound gut cello string soon)
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I drew the design in the summer 2004, began building in November 2004 and finished in October 2005. Now on to playing!