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CENTRE LATHE ASSESSORIES

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'.
3 JAW UNIVERSAL
SELF CENTRING CHUCK
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.
Note:
The tailstock centre is longer in its overall length than the headstock centre, to enable it to be ejected from the tailstock. Centre hardness: the headstock centre is softer than the tailstock centre, to enable it to be turned true should it become damaged, it is, in the truest sense, a live centre, as it rotates with the lathe’s headstock mandrel, (spindle). The tailstock centre is a hardened centre enabling it to stand up to the friction created by the revolving workpiece; it is an absolute ‘dead centre’.

4 JAW INDEPENDENT CHUCK
DEAD CENTRE
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.
Turning between chuck and tailstock centre
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LIVE OR REVOLVING CENTRES