You could have classicladder send position commands to a stepgen. How did mach3
handle the missed steps? Could you put an encoder on the stepper motor?
Chris
> From: [EMAIL PROTECTED]
> To: emc-users@lists.sourceforge.net
> Date: Wed, 17 Sep 2008 23:04:44 +0100
> Subject: Re: [Emc-users] Turret Toolchange
>
> Chris,
>
> >> Thanks for the info. Can I use ClassicLadder to drive a stepper axis?
> >> Do I have to connect the stepgen and count the pulses I send to it?
> >> or can I just instruct it to do a GCode sequence?
> >
> > Sounds like you will have to use stepgen or something like it to
> > generate pulses. If there is no feedback do you just mash it back
> > against the stop and let the stepper stall for a while, then assume
> > it's in place?
>
> Yes :o(
> That is how it was designed! (Boxford 160TCL)
>
> > Using an axis position is possible but because (I assume) it loses
> > position when you change tools due to the above, the numbers won't
> > represent anything "real". Also you would have to program A moves
> > instead of M6.
>
> Yes it loses steps.
>
> >> Does EMC automagically remember the value between sessions or do I use
> >> the
> >> external file for it to save the axis positions? (I can't remember the
> >> name
> >> of the file off the top of my head)
> >
> > No it doesn't. You would have to either start up with the turret in
> > a known position, or add some kind of sensor to "home" the turret.
> >
> > Your turret as-is seems like not a very good match for EMC's way of
> > doing tool changes where they are separate from motion axes. But
> > I bet you can make it work.
>
> I was hoping not to have to modify it at all. There isn't a tidy way to add
> a home swit
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