CENTRE LATHE ASSESSORIES |
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The
3 jaw universal self centring chuck should only be used for gripping concentric
materials, such as, ground round bar, turned round bar, cold drawn round bar,
machined or cold drawn hexagonal bar. Hot drawn round bar having an outer scale, referred to as ‘black bar’ is non-concentric and must not be gripped in the 3 jaw self centring chuck as uneven pressure would be applied to both the chuck jaws and scroll, causing permanent damage, i.e. ‘run out'. |
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3
JAW UNIVERSAL SELF CENTRING CHUCK |
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Fitting jaws in a 3 jaw chuck | |||||||||||||||||||||||||||||||
The 4 jaw independent chuck is suitable for gripping round black bar and any irregular shape within the chuck’s capacity. | |||||||||||||||||||||||||||||||
Workholding in a 4 jaw chuck | |||||||||||||||||||||||||||||||
When absolute concentricity is of the workpiece is required
throughout its length, it is essential that dead centres be used for the final
turning operation. |
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4 JAW INDEPENDENT CHUCK | |||||||||||||||||||||||||||||||
DEAD
CENTRE |
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Truing dead centres | |||||||||||||||||||||||||||||||
Illustrated
are two types of revolving centre, it is easier to turn small diameters at the
tailstock end of the workpiece with the top model. The bottom model is capable of carrying heavier loads. |
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Turning between chuck and tailstock centre | |||||||||||||||||||||||||||||||
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LIVE OR REVOLVING CENTRES | |||||||||||||||||||||||||||||||