at these points, selecting the chisel that fits best, and cutting across the grain wherever possible. Use a 9/16 inch Number 9 Addis chisel to rough out the barrel channel—this will of course have to be cut with the grain. Cut right up to the outlines until the barrel is resting down tightly against the edges of the wood. Keep working out the receiver mortice at the same time, so that the whole assembly is kept level as it settles. When the barrel is bedded about 1/8 inch less than half of its diameter, you may outline it carefully—and the receiver also—with a very sharp scriber or point of a knife. Be sure to turn the point slightly inward, keeping the outlines a bit narrower than the parts. Now remove barrel and receiver, and work out the barrel channel the full width of the outline, carefully cutting to the exact center of the knife or scriber line. Study the grain of the wood constantly, so as not to cut against it, possibly splintering or tearing beyond the lines. Use a small steel try-square, or any piece of steel having a right angle corner, to gauge the depth of rhe channel. Figure 82 illustrates the method of depth-gauging half round grooves known to all pattern makers. With the blade and head resting on the edges, the comer will just touch the bottom of groove when the right depth is reached ; moreover, when the groove is true and round, the corner of square will touch at any point on the inner surface ("b," Figure 82).
A templet like Figure 26A (Chapter 4) mav he conveniently used for gauging the depth of receiver cut at its extreme front end. This is made of sheet brass, being one half of a I 1/4 inch circle. By cutting clear down at once at this point, you have a convenient guide for many of the other cuts.
Now, having cut the barrel channel out to a true half circle, you are ready for the final fitting. The channel will be slightly narrower than the barrel, due to the scriber point having been turned slightly inward when the outline was marked. Thus the barrel is resting not quite half its depth in the channel. Work away the edges with extreme care, taking off the thinnest shaving imaginable, at the same rime working out wood as needed in the receiver mortice. Finally, the barrel will be resting on the bottom of channel, but is nor seated to quite half its depth, because our original outlines were a bit narrower than the barrel. The wide, nearly flat chisel now comes into play—and for this use it is worth its weight in
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