titanium carbide (TiC)
Extremely hard material added to tungsten carbide to reduce cratering and built-up edge. Also used as a tool coating. See coated tools.
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Glossary Terms
titanium carbonitride (TiCN)
Often used as a tool coating. See coated tools.
titanium nitride (TiN)
Added to titanium-carbide tooling to permit machining of hard metals at high speeds. Also used as a tool coating. See coated tools.
total indicator runout (TIR)
Combined variations of all dimensions of a workpiece, measured with an indicator, determined by rotating the part 360°.
tolerance
Minimum and maximum amount a workpiece dimension is allowed to vary from a set standard and still be acceptable.
tool steels
Group of alloy steels which, after proper heat treatment, provide the combination of properties required for cutting tool and die applicati…
toolchanger
Carriage or drum attached to a machining center that holds tools until needed; when a tool is needed, the toolchanger inserts the tool into…
toolholder
Secures a cutting tool during a machining operation. Basic types include block, cartridge, chuck, collet, fixed, modular, quick-change and …
toolpath, cutter path
2-D or 3-D path generated by program code or a CAM system and followed by tool when machining a part.
toolroom lathe
High-precision lathe built to hold tighter tolerances than regular, general-purpose lathes can hold. See lathe; turning machine.
tooth rest
Finger of metal that contacts a cutter edge during resharpening on a tool and cutter grinder, ensuring accurate location of edges so they a…
toughness
Tool’s ability to resist breaking during cutting.