This concern's
BUTTON jaws also known as
COLE jaws used for re-chucking bowls and platters to enable removal and of chucking points and re-shaping/finishing the bases of such large items.
I use these a lot and have two sets. The
NOVA Cole jaws which can take bowls and platters up to about 265mm (10
1/
2") in diameter, and the
AXMINSTER jaws which can take items up to 400mm (15
3/
4") in diameter.
Axminster supply an extremely useful add-on for their jaws which they call
Stacking Turn Studs pictured here
Offered as an alternative to the rubber buttons as a primary gripping device, they can also be used with the buttons to give them extra elevation above the eight jaw base-plates.
These are also fully compatible with the NOVA Cole Jaws (the buttons on both sets are secured using screws with identical threads).
This composite photograph shows (on the left) the standard NOVA Cole jaws gripping an Apple bowl, and the grip is not very secure. The right hand picture shows the same Cole Jaws with the Axminster Stacking Turn Studs which have dramatically improved the grip.
This picture shows how the studs can be double stacked if required.
NOTE: Although Axminster state that their button jaws can used at a speed of up to 1,000 rpm, I stick to the advice given with the Nova Cole jaws and never exceed 600rpm (which I find is quite adequate) and also (wherever possible) use tail-stock support.I have also attached a PDF listing the maximum and minimum capacities of both the Nova and Axminster jaws which I have printed out as a quick reference when using these jaws. Hopefully this may be of use to others who use them.