Rotary burr walking out of collet

[Mike Perkins]

I bought some 6mm burrs on a 3mm shank.

I also have a Silverline rotary tool:

I find the burr walks out and I can't seem to tighten up the collets sufficiently to make it stay in place for a decent length of time.

Is there an alternative system that doesn't have this problem?

Perhaps thread/bearing lock compound?

[tabbypurr]

Try a new collet, they don't last forever. You can also get mini jacobs chucks for 3.2mm machines.

NT

[Thomas Prufer]

The link says "3.2 mm collet" -- lokks like you have a 3 mm shank in an 1/8" collet.

Thomas Prufer

[Bob Minchin]

1/8" collets wont hold a 3mm shank properly

[Mike Perkins]

I hadn't considered that, thanks.

[Mike Perkins]

As I said in reply to Bob, I hadn't considered the difference and the consequence.

[Mike Perkins]

Thanks for the suggestion.

This has an M8 collet and I thought I'd get a small chuck like you suggest and try it out.