Bantam Chuck

Hi chaps been away for a while but hopefully I will be getting into things a bit more now, I have been given a brand new 10inch for jaw for my bantam lath but I now need to make a back plate to fit it to the lathe, I have access to a CNC mill to drill the three holes, I was wondering if any one might know the PCD for the holes to be drilled, any advice would be helpful.

Regards Alan.

Alan, you will need to create a D1-3 mount to fit your chuck, which is on the big side for a Bantam, so you will need the locking pins as well as drilling the holes, do you have these?

Have you considered buying a D1-3 back plate available from "our" suppliers and fitting the chuck to that?

A lot would depend on the configuration of the holes and the register in the back of your chuck, and the size of the commercially available plates.

Chris Gunn

10" is far too big for a Bantam or anything on D1-3.

I used to have am 8" TOS chuck on the CVA and that is as big as makes it happy.

Without measuring on a 10" chuck you could get the jaws fouling the bed when they are extended.

.

I have a Boxford with a D1-3 mounting. I 'think' the Bantam is in a similar capacity bracket.

Mine will swing (at max) about 10.5" so a 10" chuck would be the size of a faceplate. Nice to have been given it but I would say not useable for you on that machine.

Nick

I have a Colchester Master with a 10 inch 4 jaw D1-4 direct fitting and thus no backplate,this is a big heavy chuck, The Bantam is far too small for a 10 inch chuck, the holding capacity of the chuck would be limited as the jaws could not be fully extended without hitting the bed ways, also the backplate would extend the chuck further from the bearings by at least 3/4 of an inch,putting more strain on the bearings and spindle,when holding an odd shaped workpiece the out of balance caused by the work and the relatively heavy jaws would cause the lathe to rock about,forget it and swap your 10 inch for an 8 inch chuck.