RE: [CAD_CAM_EDM_DRO] Question on EMC

Art,

I personally have not seen EMC handle a rotary axis correctly when
configured as an angular axis. For me that means 1 degree is 80 steps which
EMC does not seem to be able to handle. Now if I configure it as a linear
axis where 1 unit = 360 degrees then it works much better, but then I don't
really want to tell it G01 a0.1111 to move the axis 40 degrees. I have
tried it on BDI-TNG, BDI 2.16 and one or two more BDI releases that
currently escape me. I will be downloading BDI 2.18 and the new BDI-TNG
this week to try. It is not a issue of being able to understand the
commands, it is an issue of EMC actually issuing the proper number of steps
at some commanded feed rate. Does Mach1 handle the angular axis correctly?

John Guenther
'Ye Olde Pen Maker'
Sterling, Virginia

> -----Original Message-----
> From: Art [mailto:fenerty@...]
> Sent: Thursday, December 12, 2002 12:00 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Question on EMC
>
>
> 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
>
>
>
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