grinding ratio
Ratio of work material removed to grinding-wheel material lost.
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Glossary Terms
grinding wheel
Wheel formed from abrasive material mixed in a suitable matrix. Takes a variety of shapes but falls into two basic categories: one that cut…
grit size
Specified size of the abrasive particles in grinding wheels and other abrasive tools. Determines metal-removal capability and quality of fi…
grooving
Machining grooves and shallow channels. Example: grooving ball-bearing raceways. Typically performed by tools that are capable of light cut…
growth
In cast iron, a permanent increase in dimensions resulting from repeated or prolonged heating at temperatures above 480° C due either to gr…
gundrill
Self-guided drill for producing deep holes with good accuracy and fine surface finish. Has coolant passages that deliver coolant to the too…
gundrilling
Drilling process using a self-guiding tool to produce deep, precise holes. High-pressure coolant is fed to the cutting area, usually throug…
hacksaw blade
Serrated blade for a manual or power hacksaw that cuts on the forward or return stroke. See sawing.
hard chromium
Chromium electrodeposited for engineering purposes (such as to increase the wear resistance of sliding metal surfaces) rather than as a dec…
hard tooling
Tooling made for a specific part. Also called dedicated tooling.
hard turning
Single-point cutting of a workpiece that has a hardness value higher than 45 HRC.
hardenability
Relative ability of a ferrous alloy to form martensite when quenched from a temperature above the upper critical temperature. Hardenability…