Hi Tom,

I have Mach ver 042.040 and KMotion 431c.

I also do all feed rates in G95-mm/rev. Native units are set to mm and distance moved is consistently correct.
The preceding rapid move is also consistently correct.
I let the work cycle run on few such errors and the outcome was correct, it just took way longer time.
I did not take any not on the elapsed time, but I will next time this happens. will report back.

Rgds,
Tapio

--- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@...> wrote:
>
> Hi Tapio,
>
> The only thing I can think of is that the feed rate is being set in the wrong units (mm vs inches).
>
> What Version are you using?
>
> Regards
> TK
>
>
>
> ________________________________
> From: tapiolarikka <tapio.larikka@...>
> To: DynoMotion@yahoogroups.com
> Sent: Friday, June 14, 2013 7:53 AM
> Subject: [DynoMotion] Occasional feed rate error w/ Mach3
>
>
>
>  
> Hi!
>
> I have been experiencing occasional feed rate error. Once or twice per some 100 cycle start feed goes very small, as if there was a decimal error in commanded feed rate.
>
> When I stop the work cycle, rewind the code and start over it works OK.
>
> All dro's report correct revs/feed rates.
>
> Has anyone noticed similar behavior?
>
> Any Ideas where to look for cause/cure?
>
> Rgds,
> Tapio
>

To me it looks more like a hardware rather than a software problem. Maybe some kind of electrical interference. Check list would be: reasonably short shielded signal cables, proper grounding, line filters, etc. What hardware are you using? Is it a new setup or the problem appeared suddenly?

Sorry for bad English, hope it's still clear.

RL.

--- In DynoMotion@yahoogroups.com, "tapiolarikka" <tapio.larikka@...> wrote:
>
> Hi Tom,
>
> I have Mach ver 042.040 and KMotion 431c.
>
> I also do all feed rates in G95-mm/rev. Native units are set to mm and distance moved is consistently correct.
> The preceding rapid move is also consistently correct.
> I let the work cycle run on few such errors and the outcome was correct, it just took way longer time.
> I did not take any not on the elapsed time, but I will next time this happens. will report back.
>
> Rgds,
> Tapio
>
> --- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@> wrote:
> >
> > Hi Tapio,
> >
> > The only thing I can think of is that the feed rate is being set in the wrong units (mm vs inches).
> >
> > What Version are you using?
> >
> > Regards
> > TK
> >
> >
> >
> > ________________________________
> > From: tapiolarikka <tapio.larikka@>
> > To: DynoMotion@yahoogroups.com
> > Sent: Friday, June 14, 2013 7:53 AM
> > Subject: [DynoMotion] Occasional feed rate error w/ Mach3
> >
> >
> >
> >  
> > Hi!
> >
> > I have been experiencing occasional feed rate error. Once or twice per some 100 cycle start feed goes very small, as if there was a decimal error in commanded feed rate.
> >
> > When I stop the work cycle, rewind the code and start over it works OK.
> >
> > All dro's report correct revs/feed rates.
> >
> > Has anyone noticed similar behavior?
> >
> > Any Ideas where to look for cause/cure?
> >
> > Rgds,
> > Tapio
> >
>