![]() Use the soapy sponge to clean away stubborn bits of stuck-on food. The forming tap, running at the same surface speed, spindle speed of 307 rpm, and feed of 460 mm/min, produced 6240 threads at a cost per hole of 0.01. Place a couple of drops of dishwashing liquid on a damp, non-abrasive sponge or dishcloth. PIPE TAP SPEEDS should be between one-half and three-quarters of the speeds of taps of comparable diameter and pitch. The cutting tap could produce an estimated 2281 threads at surface speed of 10 m/min, spindle speed of 322 rpm, and feed of 483 mm/min for a cost per hole of 0.02. Form tapping is typically used in steels, stainless steels, light metal alloys and non-ferrous materials. The workpiece is hard Form taps are suitable only for soft and malleable metals such as soft steel, some stainless steels, aluminum, copper, brass, and lead. ![]() Suggested speeds are 50 to 100 higher than the suggested speeds for cutting taps in similar applications. Cutting large holes with a form tap requires twice or three times as much torque as with cut taps, which can take its toll when threading large internal surfaces. ![]() I cut tap on the lathe (radially) with rigid ER25 (standard collets), 3-4% coolant (semi-synthetic), 2800 metric M5 blind holes before I toss the tap. THREAD FORMING TAPS generally form threads more efficiently at higher speeds. ![]()
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