Books › Violins and other stringed instruments : how to make them ; with numerous engravings and diagrams, 1906 › scan 26
Scan 26
Violins and other stringed instruments : how to make them ; with numerous engravings and diagrams, 1906
6 lines. Read by computer on 29 August 2026. Printed page 22. See the scan on archive.org.
1that the drill will rise when the pressure on the lever is released. The brass regulating screw s (Figs. 28 and 29) is 3 in. long and 3/8 in. in diameter, screwed thirty-six threads to the inch, with a milled head. The hole to receive it is bored a tight fit, and the screw is simply allowed to make its own thread in the hard wood of the lower arm, the top end of the screw being rounded to prevent its marking the finished surface of the plate as it is moved about on it.
3The boxwood gauge of the thicknessing appliance (see Fig. 30) may be divided either into 64ths or 100ths of an inch. A simple way to do this is to plane up a piece of boxwood 8 in. long and 1/16 in. thick by about 3/8 in., perfectly straight on one of the broad sides. Then, with thin glue, fasten it to a piece of 3/8-in. wood of the same length, and with a piece of tissue paper between them, keeping the ends flush. The boxwood is then planed down from exactly 1 in. thick at one end to a knife edge at the other, and a table knife inserted between the two thicknesses will split the tissue paper and separate them, when the adhering paper may be sponged off. If the wood is then divided into sixteen parts in the length, each division will represent 1/64 in. of an increase in thickness.
5In making a belly with this appliance, after the outside of the table has been finished to gauge, the lines of equal thickness are marked in pencil on the inside, and a row of holes about 3/8 in. apart drilled along each line to the exact depth required, intermediate lines of intermediate thicknesses being added, if more perfect gradation is desired. Longitudinal and cross sections showing the curves of thickness can be made, and from them can be got the lines of equal thickness, putting in plenty of lines to give a great number of guiding points. The depth to which the drill will cut is regulated by inserting the wedge-shaped gauge to the required division between the drill and the screw gauge, and screwing the latter up until the wedge gauge just touches both at the desired mark. When all the points have been drilled, no further
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