RE: [CAD_CAM_EDM_DRO] Re: Re: Tuning EMC

I run steppermod.o on BDI 2.12 with input scale and output scale set to
40000 with no problems. I am using CMD-260 drivers with microstepping set
to 2000 steps per rev and 20 TPI leadscrews on my Sherline 5400 This gives
2000 * 20 = 40000 steps per inch. IIRC versions of the BDI prior to 2.10
required the G20 to set them to inch mode, which I have set in the emc.ini
file as part of the RS274NGC_STARTUP_CODE parameter.

John Guenther
Sterling, Virginia

> -----Original Message-----
> From: Ray Henry [mailto:rehenry@...]
> Sent: Tuesday, May 21, 2002 10:01 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Re: Tuning EMC
>
>
>
> (comments mixed in)
>
> >    From: "mjf462001" <mjf462001@...>
> > Subject: Re: Tuning EMC
> <s>
> > I am still having problems with the MDI. I request a g91 x1. and the
> > motor only moves between .100 and .200" (no following error though)
>
> Is it possible that you have a version of the interpreter that
> needs a g20 in
> order to switch into inch mode when it starts up?
>
> > I don't use steppermod because it couldn't handle the input output
> > resolution of 10,000 (250 cpr, 2:1 belt reduction, 5 tpi leadscrew)
> > (the computer is really sluggish even the mouse moved really slow)
>
> Am I missing something here? (250 * 2 * 5 = 2500)
>
> When steppermod is started bin size is computed from max_velocity and
> Input_scale. Normally steppermod is either a go or no-go kind
> of animal.
> If it goes, it works fine. If it doesn't it will cause major problems
> including reboot or BSOD (Black screen of death) because of a
> buffer overrun
> in the real-time shared memory. Lower either value and it should
> go. BTW --
> I have seen these kind of crashes trash the system and require a reload
> 'cause it just won't run right again.
>
> > my motors seem to
> > starve for input when I ask for more than 35 imp of max velocity.
>
> This sounds like freqmod rather than steppermod? It could also
> be a problem
> with the setup of your PC. You might want to look at bogomips.
> They aren't
> very meaningful but the value should be at least 2x the speed of your
> processor.
>
> HTH
>
> Ray
>
>
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