Quote Originally Posted by Clive S View Post
Dremel and others make a very small 3 jaw chuck that might hold .5mm you might be able to hold the chuck in your collet with an adaptor. Just a thought. ..Clive
Thanks Clive. You have slightly mis-understood what I meant. I use PCB type end mill cutters which all have 1/8" shanks. The 0.5mm cutters have a very short length of cutting flutes so the broken ones leave quite a long length of 1/8" solid carbide shank to regrind as a dragknife with a decent offset to get the knife to follow. from what I read into the comment from Jazz, this may well work, but would benefit from using a modified G code. G.