n during the operation, as before stated, so that the emery plate. wheel acts at first on half of the surface to be sharpened, 3, where it will be seen that the support, D, is traversed by and then, on a half revolution of the drill, completes the ope- Pig. 1 gives a view of the machine, which is… … IMPROVED MACHINE FOR SHARPENING TWIST DRILLS. its lower extremity as a center. The oscillatory motion of The same mechanism that causes the oscillation of the car- line 1-3, to allow the mechanism to lie seen that is contained rier also effects the rotary oscillation of the bit, through the in the…
Patented · Consists · Patents · Improved · Cold air · Color · Sal soda · Ratchet wheel · Saturated solution · Horse power · Emery wheel · Green pigment · Trade catalogs · Scientific American · Full blood
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