Re: Motor errors at slow feed

Jon,
Nice to talk to you again. The error doesn't occur on the R.1313 but
on the next line (Y0 X-0.2625 R0.2625). I am using gecko 210 with the
multiplier the steps/in is 20000. Mach2 is the original control but I
tried it in Turbocnc too. Did you make the gecko connection board for
your universal stepper controller?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
> kdoney_63021 wrote:
>
> >I have a 3 amp stepping motor on my x axis it runs well with
jogging
> >and with single g00 and g01 moves. Although it growls when I use
> >feeds less then 20 it still moves correctly.
> >
> >When I execute the following coordinated movement it jitters,
growls
> >and misses steps:
> >
> >G0 G49 G40 G17 G80 G50 G90
> >M6 T0(TOOL DIA. 0.4375)
> >G64
> >G20 (Inch)
> >M04 S0
> >G00 G43 H0 Z0.5
> >X0 Y0
> >G01 Z-0.0040 F10
> >G2 Y0 X0.2625 R0.1313 F10 <- movement is fine here
> >Y0 X-0.2625 R0.2625 <- errors and noise start here
> >
> >
> What software are you using? (EMC ?)
> What drivers are you using? (Gecko ?)
> What settings have you put in to the software? What is the step
> resolution (sometimes that makes a difference)?
>
> Oh, wait a minute! You are using cutter radius compensation, with
a cutter
> of .4375" diameter (.21875" radius), and then you command it to
make a
> cut with a radius of .1313", which is smaller than the tool's
radius.
> Is that
> an inside corner or an outside corner? It is an obvious problem if
you
> try to make an inside arc move with smaller radius than the cutter.
>
> Jon