point angle
Included angle at the point of a twist drill or similar tool; for general-purpose tools, the point angle is typically 118°.
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Glossary Terms
point-to-point system
NC system normally used for drilling and other operations where center-point location is readily determined. Tool is rapidly moved to a pos…
polar additives
Animal, vegetable or synthetic oil that, when added to a mineral oil, improves its ability to penetrate the tool/workpiece interface.
polishing
Abrasive process that improves surface finish and blends contours. Abrasive particles attached to a flexible backing abrade the workpiece.
polishing attachment
Abrasive grinding device that mounts on a contour bandsaw and uses fine-grit belts to grind and polish.
powder metallurgy
Processes in which metallic particles are fused under various combinations of heat and pressure to create solid metals.
power brushing
Any process that uses a power-driven, rotating industrial brush to deburr, clean or finish a metal part. Depending on the application, the …
power hacksaw
Machine fitted with serrated blade held taut in a reciprocating frame that cuts in one direction, either on the forward or return stroke. S…
hardening
Process of increasing the surface hardness of a part. It is accomplished by heating a piece of steel to a temperature within or above its c…
hardness
Hardness is a measure of the resistance of a material to surface indentation or abrasion. There is no absolute scale for hardness. In order…
H-band steel
Alloy steel produced to specified limits of hardenability. The chemical-composition range may be slightly different from that of the corres…
headchanging machine
Multifunction, NC machine tool. It differs from machining centers in that single- or multiple-spindle heads, rather than tools, are transfe…