Robust collet

[Tom Gibbons]

I have the er32 robust collet and looking at the bottom of the collet there marked in 32nds
As to another turner has the same collets but his are marked 1/2 3/4
When I put my 1/2 bowl gouge in the 17/32 collet and slide it in to the notch on the gouge shaft it won’t tighten down enough to hold the gouge
Is it supposed to be a 1/2 inch collet or a 17/32 collet

 

[Joe Kaufman]

I received one where the collet nut would bottom out before the collet would tighten fully. Removed 1/16" from the back of the collet nut to correct the problem. You may have a similar condition.

From Robust website:
All of the ER series collets have an expansion range of a little more than 1/32″ To accommodate gouges that are slightly oversize, the collets we provide are actually 1/32″ larger than nominal. For instance, a 1/2″ collet is actually 17/32″.

 

[Tom Gibbons]

I received one where the collet nut would bottom out before the collet would tighten fully. Removed 1/16" from the back of the collet nut to correct the problem. You may have a similar condition.

From Robust website:
All of the ER series collets have an expansion range of a little more than 1/32″ To accommodate gouges that are slightly oversize, the collets we provide are actually 1/32″ larger than nominal. For instance, a 1/2″ collet is actually 17/32″.

Thanks for this info

 

[Tom Gibbons]

Problem solved
The collet was not moving up as far as it should for the ring to tighten on to it must of been something inside the threads stopping it