MicroCentric Diaphragm chucks offer accuracy and consistency
Supplied ByLeader ChuckAdded to MTD CNC: Tue Sep 15 2020
Based in the heartland of British precision engineering, the company now ranks among the world's top suppliers of Chucks, Workholding, Workpiece &
The MicroCentric MBS range of diaphragm chucks available exclusively from
Tamworth-based workholding specialist, Leader Chuck Systems, have been designed
and manufactured to support modern high performance machining operations.
Providing process safety, short setup times, high speed and high accuracy, MBS
diaphragm chucks offer manufacturing companies some major advantages.
Traditional 3- and 4-jaw chucks feature sliding jaws that move to clamp and release
the workpiece, in operation diaphragm chucks differ as the jaws are opened, 1.6 mm
on diameter, by deforming the diaphragm plate they are mounted upon. This is
achieved by use of the draw-tube or by an inbuilt air cylinder using pneumatic
pressure. It can be applied to OD machining and ID clamping with a mandrel-type
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Once the pressure required to deform or bend the diaphragm is released it returns
to its normal, clamped condition, making it fail-safe during use. MBS chucks also
‘pull back’ the workpiece to physical stops that help to achieve the <2 micron
accuracy levels attained.
The pneumatically activated MBS-L and -DL ranges extend from 80 to 300 mm and
125 to 300 mm respectively. Clamping forces are from 50 to 3,640 daN consistently
held at speeds up to 11,000 rpm. Operated by draw-tube the MBS-Z and –DZ ranges
cover the same diameters but the clamping forces increase with 1,790 to 6,230 daN
available. Both the –DL and –DZ are through bore chucks.
However the diaphragm is actuated the clamping force can be varied even when the
spindle is turning. So, thin-walled or semi-flexible parts can be securely held while
the very accurate adjustment of the clamping force ensures no deformation of the
part during any machining operations.
Sealed by design without jaw guideways the MicroCentric MBS chucks are virtually
maintenance and lubrication free for a lifetime. Enveloping the raw material to
provide a high degree of surface contact and with the ability to finely adjust the
clamping force they are especially suited to the machining of abrasive and fragile
materials such as pre- (green) and post-sintered carbide metals and ceramics.
MicroCentric MBS diaphragm chucks can be used by engineering companies to
introduce more efficient manufacturing methods, as Leader’s Managing Director,
Mark Jones, explains: “A diaphragm chuck can be used on a CNC turning centre or a
grinding machine, and is the ideal workholding solution for finishing hardened parts
such as rotors and stators. There is a significant cost saving in terms of equipment
and cycle times between grinding and hard turning operations.
“In addition to the machine characteristics, there have been great advances in
turning inserts that can provide the fine micro finish needed for hard turning. So,
there is an increase in productivity with a corresponding decrease in cost achieved
when using a diaphragm chuck.”
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