RE: [CAD_CAM_EDM_DRO] EMC, freqmod.o, A-axis, .ini settings, oh my!

I forgot one piece of information, I am running my 4 axis setup with
TurboCNC since I can't get EMC to run it correctly.

John

> -----Original Message-----
> From: Tom Benedict [mailto:benedict@...]
> Sent: Monday, August 19, 2002 11:58 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] EMC, freqmod.o, A-axis, .ini settings, oh
> my!
>
>
> On Mon, 19 Aug 2002, j.guenther wrote:
>
> > Welcome to the club!! I have been fighting this problem since the end
> > of June with no joy. It appears to be a granularity issue, and the
> > lower the steps per unit the worse it gets. I am going to reload my
> > EMC setup with BDI 2.16 so I can try it with steppermod.o as I am
> > currently running the BDI-TNG which only works with freqmod.o. I
> > really wish one of the EMC developers would track this down and fix
> > it. I have thought about running mine with input and output scale set
> > to 28800, and units set to 1. That way a 90 degree move would be g0
> > a0.25 which is not the way I want to run it but does work. Sounds
> > like you have a Sherline mill and rotary table. I have the Sherline
> > 5400 mill and got the cnc rotary table for my 55th birthday.
>
> Wellll... Almost. I've got a Taig mill, and a Sherline rotary table.
> They actually play very well together. The one catch with the Taig mill,
> though, is that it doesn't use step/dir, it uses four phase output. EMC
> doesn't like to do that, so it took some tweaking on freqmod.o to make it
> work.
>
> The upshot of this is that switching to steppermod.o would involve
> re-hacking the source to make four phase output work. Hopefully real soon
> now I'll be able to afford the electronics to convert step/dir to four
> phase output so I can use EMC talking step/dir. That'll also mean I can
> run the whole beast off a single parallel port. Some day (hopefully
> soon...)
>
> In the mean time I'm trying to get things working. DANG this is driving
> me nuts!
>
> If I find anything, I'll let you know.
>
> Tom
>
> > > -----Original Message-----
> > > From: Tom Benedict [mailto:benedict@...]
> > > Sent: Monday, August 19, 2002 11:24 AM
> > > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > > Subject: [CAD_CAM_EDM_DRO] EMC, freqmod.o, A-axis, .ini
> settings, oh my!
> > >
> > >
> > > Here's the setup:
> > >
> > > I've got a stepper-based mill that's got four axes. The A axis is a
> > > rotary table that's bolted to the mill bed so the axis points
> parallel to
> > > the X-axis.
> > >
> > > I'm running the latest rev of the BDI, and the motors are set
> up to use
> > > freqmod.o.
> > >
> > > I'm trying to tune the .ini parameters for the fourth axis so I can
> > > address the rotary table in units of degrees. The linear
> axes are being
> > > addressed in units of inches.
> > >
> > > I've got 200 step/in motors that are being half-stepped. The
> linear axes
> > > have 20TPI leadscrews, so that winds up being 8000
> steps/inch. The rotary
> > > axis has a 1:72 worm gear on it, and uses the same motor as the linear
> > > axes. So at 5 degrees per revolution of the motor, that's 80
> steps per
> > > degree.
> > >
> > > Now for the troubleshooting:
> > >
> > > I've got the linear axes pretty happy. I don't have my .ini
> file in front
> > > of me, but I use an INPUT_SCALE and OUTPUT_SCALE of 8000.0 0.0,
> > > LINEAR_UNITS of 0.03937007874016 in [TRAJ] and UNITS of
> 0.03937007874016
> > > inside each [AXIS_*] section (I'm using inches), and a P of 500.0.
> > >
> > > I've got ANGULAR_UNITS set to 1.0 in [TRAJ] and UNITS set to 1.0 in
> > > [AXIS_3]. With all the other parameters set the same, if
> INPUT_SCALE and
> > > OUTPUT_SCALE is set to 8000.0 0.0, the axis works, but it's not being
> > > addressed in terms of degrees. If I change INPUT_SCALE and
> OUTPUT_SCALE
> > > to 80.0 0.0, the axis ceases to function.
> > >
> > > I've tried dinking with this a fair amount. I can marginally get it
> > > working with the SCALEs set to 800.0 0.0, and address it in
> terms of tens
> > > of degrees (so G0 A9.0 would rotate it 90 degrees), but obviously this
> > > isn't what I'd like it to do.
> > >
> > > Has anyone got a stepper system using freqmod.o to work with a rotary
> > > axis? Can anyone share a success story that would help me
> get this thing
> > > working?
> > >
> > > Any and all help is much appreciated.
> > >
> > > Thanks,
> > >
> > > Tom
> > >
> > >
> > > Addresses:
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> > > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
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> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to
> reach it if you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this
> as a sister site to the CCED group, as many of the same members
> are there, for OT subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
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Addresses:
FAQ: http://www.ktmarketing.com/faq.html
FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/

OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
http://www.metalworking.com/news_servers.html

http://groups.yahoo.com/group/jobshophomeshop I consider this as a sister
site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.

NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........

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