drilling machine (drill press)
Machine designed to rotate end-cutting tools. Can also be used for reaming, tapping, countersinking, counterboring, spotfacing and boring.
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Glossary Terms
Latest Glossary Terms
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…
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…
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…
ductile fracture
Fracture characterized by tearing of metal accompanied by appreciable gross plastic deformation and expenditure of considerable energy.
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…
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 …
dynamometer
When drilling, a device for measuring the generated torque and axial force (thrust). When milling, a device for measuring the generated tor…
electrochemical machining (ECM)
Operation in which electrical current flows between a workpiece and conductive tool through an electrolyte. Initiates a chemical reaction t…
eddy-current testing
Electromagnetic, nondestructive testing method in which eddy-current flow is induced in the test object. Detects changes in flow caused by …
electrical-discharge grinding (EDG)
Process similar to conventional electrical-discharge machining except a grinding-wheel type of electrode is used. See EDM, electrical-disch…
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.
