heat-affected zone
That portion of the base metal that was not melted during brazing, cutting or welding, but whose microstructure and mechanical properties w…
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Glossary Terms
heat-treating
Process that combines controlled heating and cooling of metals or alloys in their solid state to derive desired properties. Heat-treatment …
heeling (heel drag)
Rubbing that occurs on the cutter’s heel, the area just behind the tooth’s cutting edge.
helical cutter
Endmill or other cutter with spiral or helical flutes. May be right- or left-hand.
helix angle
Angle that the tool’s leading edge makes with the plane of its centerline.
high-speed steels (HSS)
Available in two major types: tungsten high-speed steels (designated by letter T having tungsten as the principal alloying element) and mol…
hydrodynamic machining
General term for various forms of waterjet and abrasive waterjet machining. In all cases, a fine, highly pressurized jet of water cuts and …
inscribed circle (IC)
Imaginary circle that touches all sides of an insert. Used to establish size. Measurements are in fractions of an inch and describe the dia…
inner diameter (ID)
Dimension that defines the inside diameter of a cavity or hole. See OD, outer diameter.
impact test
Test to determine the behavior of materials when subjected to high rates of loading, usually in bending, tension or torsion. The quantity m…
inches per minute (ipm)
Value that refers to how far the workpiece or cutter advances linearly in 1 minute, defined as: ipm = ipt 5 number of effective teeth 5 rpm…
inches per tooth (ipt)
Linear distance traveled by the cutter during the engagement of one tooth. Although the milling cutter is a multi-edge tool, it is the capa…