Glossary Terms

Glossary-terms October 30, 2018

Machine designed to rotate end-cutting tools. Can also be used for reaming, tapping, countersinking, counterboring, spotfacing and boring.

Glossary-terms October 30, 2018

drive plate

Attaches to a lathe spindle and has a slot or slots that engage a driving dog to turn the work. Usually used in conjunction with centers. S…

Glossary-terms October 30, 2018

driving dog

Device having a ring or clamp on one end that slips over the workpiece to be turned; a screw secures the workpiece in place. The dog’s oppo…

Glossary-terms October 30, 2018

ductile cast irons

Ferrous alloys in which graphite is present as tiny balls or spherulites. The spheroidal graphite structure is produced by adding one or mo…

Glossary-terms October 30, 2018

ductile fracture

Fracture characterized by tearing of metal accompanied by appreciable gross plastic deformation and expenditure of considerable energy.

Glossary-terms October 30, 2018

ductility

Ability of a material to be bent, formed or stretched without rupturing. Measured by elongation or reduction of area in a tensile test or b…

Glossary-terms October 30, 2018

dynamic stiffness

Measure of a machining system’s ability to dampen vibration from a forced input. If the dynamic stiffness of a system is not sufficient to …

Glossary-terms October 30, 2018

dynamometer

When drilling, a device for measuring the generated torque and axial force (thrust). When milling, a device for measuring the generated tor…

Glossary-terms October 30, 2018

Operation in which electrical current flows between a workpiece and conductive tool through an electrolyte. Initiates a chemical reaction t…

Glossary-terms October 30, 2018

eddy-current testing

Electromagnetic, nondestructive testing method in which eddy-current flow is induced in the test object. Detects changes in flow caused by …

Glossary-terms October 30, 2018

Process similar to conventional electrical-discharge machining except a grinding-wheel type of electrode is used. See EDM, electrical-disch…

Glossary-terms October 30, 2018

edge finder

Gage mounted in the spindle of a vertical mill and used, while rotating, to find the center of a part relative to the toolholder.