Re: [ATM] ATM Digest, Vol 25, Issue 27

["Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>]

Thomas,

> I have to trepan out 4, 4? diameter disks of plate glass (tools for
> doing a triplet), I just can?t recall what the optimum speed/RPMs for
> the cutter is, I can get down to 300rpm with what I have on hand but any

I've done this on a 6" with a normal drillpress, I believe 600rpm lowest
speed. The motor will slow down automatically when it has to deliver serious
effort. The disk came out in short time. I found that you have to refresh
grit very often and make short goes with the highest pressure that doesn't
stop the drill.
See http://home.hetnet.nl/~artm/atm/rft/log_m.html

> BTW I think I might have to makings for a 12? or so pulley, but I?ll
> have to check. A 12? final pulley would get me down to somewhere around
> 170rpm, but it would be a homemade, improvised job, so not as well
> centred as a bough cast metal one?.

Tried this first with two pulleys and a V belt, but it was a complete
disaster. Too quick and too dirty a job I guess.

Good luck,
AtM

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