quench hardening
1. Hardening alpha-beta alloys (most often copper or titanium alloys) by solution-treating and quenching to develop a martensite-like struc…
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Glossary Terms
quenching
Rapid cooling of the workpiece with an air, gas, liquid or solid medium. When applicable, more specific terms should be used to identify th…
quick-change toolholder
Cutter holder that permits rapid tool changes. Generally associated with automatic or semiautomatic machining operations. See toolholder.
rack-milling attachment
Attachment for cutting gear teeth, usually in a straight line, but, when used in conjunction with universal spiral-index centers on a unive…
radial drill
Large drill with an arm that pivots about a column to provide positioning flexibility and great reach and stability. See drilling machine, …
radial rake
Also known as the tool back rake, the angle between the tooth face and the radial plane through the tool point.
rake
Angle of inclination between the face of the cutting tool and the workpiece. If the face of the tool lies in a plane through the axis of th…
ramp milling
Milling process in which the machine tool spindle is feeding simultaneously in an axial and radial direction.
rancidity
Bacterial and fungal growths in water-miscible fluids that cause unpleasant odors, stained workpieces and diminished fluid life.
rapid traverse
Movement on a CNC mill or lathe that is from point to point at full speed but, usually, without linear interpolation.
reamer
Rotating cutting tool used to enlarge a drilled hole to size. Normally removes only a small amount of stock. The workpiece supports the mul…
recarburizing
1. Increasing the carbon content of molten cast iron or steel by adding a carbonaceous material, a high-carbon pig iron or a high-carbon al…