Pattern making; a practical treatise for the pattern maker on wood-working and wood turning, tools and equipment, construction of simple and complicated patterns, modern molding machines and molding practice (1916)
Ritchey, James, Monroe, Walter W. (Walter William), b. 1869 · Chicago, American technical society · leaf 40
(3 Q t*3 Fig. 51. Extension Bit holes, and especially in very hard woods, a 10-inch or 12-inch sweepis necessary. Bits. Wood-boring bits are made in many styles. The mostimportant are the auger bits, two styles of which are shown in … Fig. 52. Gimlet and Wood Drill Fig. 50. They can be bought in sizes running by sixteenths of aninch from -^ inch to 1 inch. For holes larger than 1 inch, the No. 2extension bit, shown in Fig. 51, is the best. It has two cutters,and will bore a hole of any size from J inch to 3 inches in diameter.…
Patternmaking
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