Re: [CAD_CAM_EDM_DRO] Question on EMC

Hi Art,

My 0.02 USD, as I can't speak from authority on how it "should" work.
What about adding a parameter to allow the user to select "linear" (?)
or "rollover" mode? That's what I was thinking of doing. I only use my
rotary table in the "linear" fashion. I do recall an RDF (radio
direction finding) project (CY545 controller) I did in which the stepper
and gearbox DID want to operate in a "rollover" fashion. Although that
project was a "canned" project, our controller programs would be able to
handle that motion control task; if the parameter was added.

Alan KM6VV
got NURBS?


Art wrote:

>
> Hi All:
> One of my Mach1 users has asked what posts for various programs can use
> the rotary axis, due to the fact that they do not rollover to 0 at 360
> degrees. The Posts he's using can't seem to handle the math. Mach1 uses the
> EMC interpreter so I thought I'd ask the experts.
>
> Is the fact that EMC's rotary axis work in a linear fashion a problem?
> Does anyone else have this problem in rotary work. The general concensus
> among users seems to be that they don't want the rotaries to rollover at
> 360, but I can see this users point. The distance from 350 degrees to 20
> degrees really SHOULD be a command like A+30.0 instead of A380, but if the
> posts support A380 there should be no problem. Do the current posts you use
> support the rotary axis in a linear fashion or is EMC configurable( if so I
> haven't seen the code) to 360 rollover with + and - G-Code commands for
> direction?
>
> Thanks,
> Art
> www.artofcnc.ca