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Definitions

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Select the first letter of the word from the list above to jump to appropriate section of the glossary. If the term you are looking for starts with a digit or symbol, choose the '#' link.

- A -

accuracy

The accuracy of a chuck/expanding arbor measured in inches TIR is comprised of two components:

  • The distance between the centerline of the machine spindle and the centerline of the workholding device.
  • A random variation about the centerline of the workholding device caused by conditions built into the chuck such as internal friction and sliding fits. See repeatability.

actuator

A device that clamps the chuck or expanding arbor through the aid of pneumatic or hydraulic energy.


arbor

See definition of expanding arbor.

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- B -

backstop

See definition of workstop.

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- C -

chuck

A workholding device which grips primarily on the outside diameter of a rotational part.


clamping cylinder

See actuator.


collet

A split sleeve which when expanded or contracted, grips the workpiece.


collet chuck

A workholding device using a collet.


compensating chuck

A chuck in which jaw(s) move to or away from the workpiece without altering the position of the workpiece.


crankshaft chuck

A chuck capable of gripping and positioning a crankshaft off-center for turning or grinding operations.

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- D -

dead length

the action of gripping a workpiece without changing its axial position.


diaphragm chuck

A chuck that uses the deformation of a flexible material to grip a workpiece.

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- E -

expanding arbor

A workholding device which grips on an inside diameter or feature.


arbor

See definition of expanding arbor.

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- F -

face driver

A split sleeve which when expanded or contracted, grips the workpiece.


FIR

Full indicator reading. Used interchangeably with TIR. TIR is generally preferred.


first operation chuck/expanding arbor

A workholding device designed to grip on unmachined castings, forgings or bar stock.


fixture

A device used to locate or support material, workpiece(s), or tool(s) during machining operations. Usually custom designed to hold a specific workpiece.

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- G -

(empty)

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- H -

(empty)

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- I -

indicating band

A diameter on the chuck body designated for measuring runout of a chuck.

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- J -

(empty)

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- K -

(empty)

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- L -

(empty)

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- M -

mandrel

A cylindrical or symmetric shaft, sometimes tapered, that locates on the internal diameter (ID) or feature of the workpiece.


master jaw

The moving part in a chuck to which the top jaw is mounted. top jaw

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- N -

(empty)

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- O -

(empty)

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- P -

pull-back

A chuck/expanding arbor is said to have "pull-back" action if it simultaneously grips and pulls the piece part back against a workstop.

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- Q -

(empty)

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- R -

repeatability

The random component of chuck accuracy measured in inches TIR.


retracting jaw chuck

A chuck which grips shafts for turning the complete length by retracting jaws into the chuck face to allow the area previously gripped to be machined. Either a face driver or expanding arbor provides the torque when machining the area previously gripped by chuck jaws.


rotational part

A piece part symmetrical about a central axis.

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- S -

second operation chuck/expanding arbor

A workholding device designed to grip on previously machined surfaces.


self-centering chucks

A chuck in which all jaws move to or away from the workpiece and maintain on common center.


self-contained

A Chuck/expanding arbor with an integral pneumatic or hydraulic power cylinder.


soft jaw

Top jaw blank that can be machined to specific dimensions Soft jaws are mounted to the master jaws.

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- T -

TIR

Total indicator reading.


top jaw

The component that clamps the workpiece and is mounted on the master jaw.

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- U -

(empty)

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