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Copyright 2002
Positrol, Inc.
All rights reserved |
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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.
- 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.
- backstop
See definition of workstop.
- 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.
- 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.
- expanding arbor
A workholding device which grips on an inside diameter or
feature.-
- expanding mandrel
See definition of expanding arbor.
- 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.
- (empty)
- (empty)
- indicating band
A diameter on the chuck body designated for measuring runout of a
chuck.
- (empty)
- (empty)
- (empty)
- 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
- (empty)
- (empty)
- 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.
- (empty)
- 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.
- 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.
- TIR
Total indicator reading.-
- top jaw
The component that clamps the workpiece and is mounted on
the master jaw.
- (empty)
- (empty)
- workstop
That surface on the chuck/expanding arbor which establishes the axial
location of the piece part. -
- (empty)
- (empty)
- (empty)
- (empty)
Revised: June 24, 2002.
Copyright © 2002 by Positrol, Inc..
All trademarks or product names mentioned herein are the property of
their respective owners.
Reference: Association for Manufacturing
Technology. "Workholding Glossary of Terms 2001.
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