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Mystery chuck jaws?

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crazylegs:
Anyone got any ideas about these jaws? They have a shallow square sided grove machined in the face. What do they hold and how?

Derwent Woodturning club:
I think you are looking at the rear face of the jaws and the shallow groove is to locate them accurately on the carriers. Also most holes are countersunk on the top face. Could you post a pic of the other side?

crazylegs:
No this is the front face the other side has the narrower locating slot.

Twisted Trees:
Still need more photo's from more angles, that one picture isn't helpful!

fuzzyturns:
This could be set of jaws to mount your own large custom jaws made of wood or similar material. In theory you could mount your custom jaws straight onto mounting jaws, but the contact surface is quite limited, and would therefore allow for a relatively large degree of flexibility or inaccuracy, whereas with these, there would be a much larger contact surface. Just a guess, though.

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