On 17 May 2010 17:11, Viesturs Lācis <[email protected]> wrote:

> 4) press button, which returns to saved coordinates. here is
> important, that first move is in XY plane, Z move is last

That might not work for a lathe, or a hot-wire cutter, or a
fly-fishing rod maker or.....

One of the strengths of EMC is its flexibility, which has led to it
being used on a vast range of machines. Unfortunately that means that
any changes have to (as far as possible) retain that generality.

The last time this was discussed I thought that replaying the jogs in
reverse would work as long as it recorded the position each time the
machine stopped. That was because I was using the keyboard to jog. Now
I can jog with my analogue joysticks, and it is nothing like as simple
to record the path.

I have been wondering if it would suffice to allow retraction in one
direction only (the first direction you choose) under pause. That
would cover about 75% of situations and makes the return move easy for
the code. It would allow touch-off to the top of the work and to
movable touch-sensors. it wouldn't work for fixed touch-off plates. No
good for milling T-slots or turning internal grooves though.

-- 
atp

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