accuracy
The accuracy of a chuck/expanding
mandrel measured in mm 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.
actuator
A device that clamps the chuck or
expanding mandrel through the aid of pneumatic or hydraulic cylinder.
chuck
A chuck is
a specialized type workholding device usually used to hold a rotating workpiece
(such as the bar or blank in the headstock spindle of a lathe)
clamping
cylinder
See actuator.
collet
A collet is a holding
device—specifically, a subtype of chuck—that forms a collar around the object
to be held and exerts a strong clamping force on the object when it is
tightened, usually by means of a tapered outer collar to grip the work piece.
collet
chuck
A device that uses a collet for
workholding.
compensating
chuck
A chuck in which the jaws
individually locate their gripping diameter without altering the position of
the workpiece.
crank
Shaft Machining Chuck
A special power chuck designed for
crank shaft Eccentric Turning and milling operations. This chuck can be tailor
made to suit machine. Crankshaft is held between centres of RH and LH chuck.
Aligning jaw of the chuck facilitates job clamping. Chucks are actuated by
hydraulic cylinders.
dead
length
The action of gripping a workpiece
without changing its axial position and uses the face of the spindle as its
locating surface for the inner collet.
diaphragm
chuck
A chuck that uses the deformation of
a flexible material to grip a workpiece and is ideal for thin walled
components. Diaphragm chucks are primarily used for light accurate turning,
fine boring, facing and grinding operations.
expanding
mandrel
A workholding device which is used
for internal diameter clamping of component to machine in a single setup
face
driver
Face Driver allows roughing and
finishing operations completed in one clamping and you will able to machine the
entire length of the workpiece in one operation.
first
operation chuck
A workholding device designed to
grip on unmachined castings, forgings or bar stock.
fixture
A work-holding or support device
used to securely locate or support material, workpiece or a tool during
machining operations ensuring that all parts produced using the fixture will
maintain conformity and interchangeability. Usually custom designed to
hold a specific workpiece.
indicating
band
A diameter on the chuck body
designated for measuring runout of a chuck.
mandrel
see expanding mandrel
master
jaw
The moving part in a chuck to which
the top jaw is mounted.
pull-back
chuck
This Chuck is ideal for the
finishing operation, it simultaneously grips and pulls the piece part back
against a workstop. The Radial pull back function of the chuck ensures a
positive resting of the component after clamping
repeatability
The repeated accuracy of chucked
workpieces, especially the workpieces with a relatively higher length/diameter
ratio used for production of duplicate parts.
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
A workholding device designed to
grip on previously machined surfaces.
self-centering
chucks
A self-centering chuck, also known
as a scroll chuck in which all jaws move to or away from the workpiece and
maintain on common center.
self-contained
A Chuck with an integral or built-in
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.
top
jaw
The component that clamps the
workpiece and is mounted on the master jaw.
