On 2010-08-09, Joseph Gwinn wrote:
In article ,
Ignoramus2412 wrote:

On 2010-08-08, Wes wrote:
Ignoramus2412 wrote:

Our older cnc lathes with gear boxes require a M41 or M42 command to
switch gear ranges.
Perhaps you could implemnet something similar where the command emits an
output you use to
shift the sheave. IRRC M41-44 are typical gear change M codes.

Wes, yes, I would like to find some good G code number and then
implement it. I got some suggestions on emc-users on how to do it,
with comparator elements of EMC. But speed change should only happen
during speed change, and not at any other moment, like reversal or
whatnot. If I get it to work, it will be much better than VFD, and
will let me tap with relatively larger taps.

I have a question, does your lathe have a back gear much like a
manual Bridgeport? I've never seen a mill like yours.

My Clausing lathe does not have a back gear.

Really? I find this hard to believe.

Joe Gwinn

Joe, I have a feeeling that I am wrong, but I am away from home.

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