Metal-work; a handbook for teachers and students (1914)
Adam, Hugh M. [from old catalog], Evans, James Humphrey, [from old catalog] joint author · New York, Longmans, Green and co.; London, E. Arnold · leaf 136
d off. SMALL HAND TOOLS 119 Small taps are sometimes made by filing four flats on thethreaded portion; but, as the cutting angle is somewhereabout 135 degrees, they are far from satisfactory. Fluting to form cutting angles is now almost universal, and gives anangle of about 90 degrees. The… … Fig. 82. section into a regular hexagon. Alternate portions are flutedout to form a semicircle, and the three remaining portions arethreads. Taps are always made from cast-steel of very high qualityand of uniform texture, and are hardened and tempered to alight straw colour. For hardening a tap,…
Metal-work
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