> Date: Mon, 5 Sep 2011 17:38:28 -0500
> From: [email protected]
> To: [email protected]
> Subject: Re: [Emc-users] M3/M4 and M5
>
> Not to throw a monkey wrench in at this point, but...
>
> Many commercial controls have a "minimum spindle speed"
> integer parameter. I seem to recall that it holds the
> analog output at "zero" until the S speed requested is
> above the minimum value, then it pops up (down?) to where
> it should be. I don't recall what it does in the case of
> simple M3/M4 outputs to a pair of contactors, maybe that
> would cycle on (fwd/rev) as usual?
>
> Kim
I'm not sure how that would impact what was request by Viesturs.
At the moment EMC is almost completely open loop with the
spindle ( aside from spindle-at-speed, which has narrow control ).
Any control of the spindle such as velocity ramping or min speed
has to be done in HAL control or with a VDF. In the case of the
changes the spindle-on pin can be used as a status to a VDF or
another component to say do whatever you need to do to act on
the S speed which may or may not be zero at this moment.
If you are using a contactor only for running the spindle then
S speed in G code is not needed which make sense as there is no
way to set a speed.
Your minimum speed setting could be rigged in with spindle-at-speed
and or motion.feed-hold (though that can be ignored).
This patch makes it easier to use a machine that has no spindle speed
changing capability at all while not changing much for a machine that does.
Chris M
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