On 24/11/2016 00:24, wrote:
On Wednesday, 23 November 2016 22:43:13 UTC, Mike Perkins wrote:
I bought some 6mm burrs on a 3mm shank.

I also have a Silverline rotary tool:

http://www.silverlinetools.com/en-GB...i-Tools/249765

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?

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

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.

--
Mike Perkins
Video Solutions Ltd
www.videosolutions.ltd.uk