Canadian machinery and metalworking (July-December 1917) . on cut V above, one-third of the land from the cuttingedge has concentric relief. The remainingtwo-thirds is eccentrically relieved. A tapmade in this way can be ground for sharpen-ing at the only correct point—on the face ofthe cutting edge. Sharpening in no wayaffects its size or the form of the thread. The Taper Tap has a cylindrical pilot and on the cham-fered portion of the tap the top of the thread is relievedclear to the cutting edge to secure keen cutting qualities. The construction of Pratt & Whitney Taps not onlyinsures great
Canadian machinery and metalworking (July-December 1917) . on cut V above, one-third of the land from the cuttingedge has concentric relief. The remainingtwo-thirds is eccentrically relieved. A tapmade in this way can be ground for sharpen-ing at the only correct point—on the face ofthe cutting edge. Sharpening in no wayaffects its size or the form of the thread. The Taper Tap has a cylindrical pilot and on the cham-fered portion of the tap the top of the thread is relievedclear to the cutting edge to secure keen cutting qualities. The construction of Pratt & Whitney Taps not onlyinsures greater accuracy and refinement than has here-tofore been possible to obtain in a commercial tool, butalso insures the freest cutting tap with the longest life—an exclusive P. & W. Combination. Precision Machine Tools, Standards 6& Gauges PRATT&WHITNEYCO: of ^ Canada, Limited MONTREAL723 Drummond Bldg. Works: DUNDAS, ONTARIO TORONTO WINNIPEG 1002 Bldg. 1205 McArthur Bldg. Equipment Co. July 12, 1917. CANADIAN MACHINERY. Built-in-Merit
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmachinery, bookyear19
