21440Re: [turbocnc] coordinates drift !
- Nov 26, 2013Hi Art.
good... just went and tried that but no luck.
No backlash compensation and the problem remains...
So I must be loosing steps...
<how only G2 G3 loose steps... that is the one killing me !!!!>
I will override the feed-rate to 10%, it will move slower than
a dead turtle and will see if the problem remains the same.
In the mean time I'll be setting up another PC...
On 11/26/2013 2:37 AM, Art Eckstein wrote:
> Try turning off backlash compensation. I found this to be a problem
> using home switches before I had zero backlash nuts on the axis.
> Country Bubba
> At 08:49 PM 11/25/2013, you wrote:
> >Thank you all for the very good suggestions.
> >Verified mechanical tightness of the step-motor shafts and it is ok
> >btw, the table moves quite light so the step motors make very little
> >even so it is solid tight.
> >long cycle of G1's make no errors
> >same part but using large doses of G2 G3 to round corners is a disaster !
> >To be done:
> > - testing another PC. (I see what you mean... I may have
> > noises on this
> >PC LPT )
> > - testing CNCpro
> > - testing Mach3 ?! (but I rather prefer to stay without mouse etc...)
> >I see the movements of the G2 and G3 quite odd !!!
> >It slows down immensely despite having the same feedrate as a G1 move.
> >I would say an arc at F200 goes at 1/10 of the speed of a linear move
> >even if the arc is shallow like a straight line.
> >Is this normal ??? Or am I having an issue here ?
> >Also apparently if the arc makes one axis move positive and then negative
> >I don't see it applying the backlash compensation when it inverts motion
> >inside the arc... but this could be my eyes ;-)
> >Luis Cupido
> >btw, machine is a 486DX2 66MHz... maybe it is a too slow PC !!!
> >but it has been excellent so far ! :-(
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