On Fri, 01 Oct 2004 10:57:31 +0100, Andy Dingley
wrote:

On Fri, 01 Oct 2004 06:54:24 +0100, Mike Halmarack
wrote:

But I think you're exaggerating the lack of tolerance between the 2
for practical purposes.

You haven't seen this done, have you ?

The problem is that collets are hardened and relatively stiff. They'll
tighten down to any size, but they then form a cone that's only
gripping over a short ring, not the full length. The cutters ran off
axis and if 1/4" is forced into 6mm they form an open-mouthed cone
that's just asking for a flyer.

Remember the old Bosch routers, where they were supplied with a 6.4mm
collet, a couple of 6mm cutters and an adapter shim that most people
ignored. They'd hold reasonably well (any cutter slip didn't cause it
to work much looser) , but the 6mm cutter ran well out of true.

Shouldn't be a problem though. I expect that the motor will burn out
before it reaches full speed :-)

Either that or there'll be 0.2mm run out on the spindle anyway.....




..andy

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