Re: [SherlineCNC] CNC Lathe Question - Backlash how is everyone compensating for it?
- Hi Joe,
Work on the lathe is a little different from the mill, most all cuts are in the
same direction, and backlash will be "ran out" in normal use. For CNC, as long
as each cut is approached (after a retract) for some minimal distance, the
backlash is out, just like in manual operation (my observations, can others
But yeah, an additional nut that could be spring loaded against the carriage nut
> As Dave Hylands stated - that you could just tweak the G-code, and
> approach the part in a way that removes the backlash.
> Has anyone found a good way to "eliminate" backlash?
> I chose the Sherline Mill for this reason - as it has anti-backlash
> adjustments. But - the Lathe does not have anti-backlash adjustments!!
> I did order the anti-backlash for the Z-axis of the lathe. But
> Sherline doesn't seem to make anything for the X-axis.
> Maybe some kind of brass nut, with a slit, and compressed slightly?
> Maybe some kind of delrin nut?
> Any advice?
- I used some brass tubing to punch out some washers
from .030" polyethelyne, and I sandwiched those
between the Sherline anti-backlash star nuts and where
they face against. This cut my backlash down on the X
to .0005", on the Y to .00075" and the Z to .0015. I
can live with that. I am using DeskCNC and IMService
servo system, which seems to be able to handle that
well. I get excellent repeatability with my setup.
--- montanaaardvark <boblombardi@...> wrote:
> --- In SherlineCNC@yahoogroups.com, "joecomunale1"__________________________________________________
> <joecomunale@c...> wrote:
> > Backlash:
> > As Dave Hylands stated - that you could just tweak
> the G-code, and
> > approach the part in a way that removes the
> > Has anyone found a good way to "eliminate"
> > I chose the Sherline Mill for this reason - as it
> has anti-
> > adjustments. But - the Lathe does not have
> > I did order the anti-backlash for the Z-axis of
> the lathe. But
> > Sherline doesn't seem to make anything for the
> > Maybe some kind of brass nut, with a slit, and
> compressed slightly?
> > Maybe some kind of delrin nut?
> > Any advice?
> Not on a lathe but on a mill, I measure the backlash
> with a dial
> indicator and then enter that value into TurboCNC to
> backlash. I thought most CNC controllers had a
> I can make a few hundred 'back and forths' during a
> part and not
> have it creep out.
> Actually, my all time favorite quote, from years of
> reading these
> Sherline groups was, "your machine has backlash.
> Get over it".
> Meaning all machines have backlash, our job is to
> learn how make
> accurate parts despite that.
> Hope this helps,
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