Re: [CAD_CAM_EDM_DRO] Help please: Stuttering Stepper Motors in Jog Mode

Hello Stephen,

I think Jon just mentioned EMC because he knows that I also tried EMC
for a while and had some problems with the metric versions. In
particular, backplotting was not possible since the graphics were 25.4
times the size that they should have been. Everything in mm was too big
for the screen.

However, there are still some unresolved metric issues with TurboCnc
4.x. I had some recent problems with setup. Not sure but I think it was
with backlash compensation. My gauge is metric but I could not enter the
backlash in mm. I had to convert to inches and enter it that way.

In any case, my point was that TurboCnc was never tested as thoroughly
in metric mode as it was in imperial mode so more metric bugs got
through than imperial bugs. Perhaps this was just a consequence of the
small number of folks using the metric options and catching the bugs.

Since Thomas is using metric options I thought it was worth mentioning
that I have experienced odd behaviours that occur in metric mode but not
in imperial mode. So trying things in imperial mode might be worth the
effort, just to see if it is one of those metric-only bugs.

Speaking of misbehaving modes, there is a simulator (the free one that
requires "more petrol" every few months) that works ok in metric mode
but is really screwy in imperial mode. It also does not recognize G20
and G21 (or G70 and G71) to program the choice of metric or imperial
modes. The choice must be made when running the simulator. Even so, it
behaves much better in metric mode than in imperial mode.

I think it was the tool table that was metric even when imperial mode
was selected.

Tom Hubin
thubin@...

******************

Stephen Wille Padnos wrote:

>
> Jon Elson wrote:
>
> >Tom Hubin wrote:
> >
> >
> >>[snip]
> >>
> >>
> >I'm pretty sure this has all been fixed. I set up a machine
> >entirely in metric units recently, with the encoder counts/mm as
> >the INPUT_SCALE in the ini file, and it all worked fine, once I
> >got used to the right range of values. I agree, EMC1 had some
> >problems with metric user units.
> >
> >
> Wasn't this discussion about TurboCNC?
>
> EMC used to have a problem when the scale was very low - like <10
> counts
> per user unit. This would generally only occur for metric machines
> (because mm are so much smaller than in :) ). That may be the problem
> you saw (which I believe has since been fixed).
>
> - Steve