Re: [CAD_CAM_EDM_DRO] Motor errors at slow feed

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