GRBL Tweaks - Need Moar Power!

[dregalia]

Howdy folks.

So, we finished our rebuild of a 1986 GERBER 600, and we're using GRBL on an arduino.. So far, everything works great, but we know the machine should be able to run faster.

Currently, these are the settings we're using.. Can anyone make some suggestions to start tweaking to maybe pick up a little more speed on the movement? I have a GRBL Cnc at home that when I tell it to move @ 100ipm, it moves.. but this one here.. doesn't seem like it's moving @ 100ipm when I set the speed in the GCode. I know there are some gearing differences between the machines,

Anyways, thanks for your advice ahead of time.. still working on learning the GRBL Settings.

>>> $$
$0=10 (step pulse, usec)
$1=255 (step idle delay, msec)
$2=0 (step port invert mask:00000000)
$3=5 (dir port invert mask:00000101)
$4=0 (step enable invert, bool)
$5=0 (limit pins invert, bool)
$6=0 (probe pin invert, bool)
$10=3 (status report mask:00000011)
$11=0.010 (junction deviation, mm)
$12=0.002 (arc tolerance, mm)
$13=0 (report inches, bool)
$20=0 (soft limits, bool)
$21=0 (hard limits, bool)
$22=0 (homing cycle, bool)
$23=0 (homing dir invert mask:00000000)
$24=25.000 (homing feed, mm/min)
$25=750.000 (homing seek, mm/min)
$26=250 (homing debounce, msec)
$27=1.000 (homing pull-off, mm)
$100=50.000 (x, step/mm)
$101=50.000 (y, step/mm)
$102=78.431 (z, step/mm)
$110=1000.000 (x max rate, mm/min)
$111=1000.000 (y max rate, mm/min)
$112=500.000 (z max rate, mm/min)
$120=500.000 (x accel, mm/sec^2)
$121=150.000 (y accel, mm/sec^2)
$122=150.000 (z accel, mm/sec^2)
$130=200.000 (x max travel, mm)
$131=200.000 (y max travel, mm)
$132=200.000 (z max travel, mm)
ok

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[Biggs427]

$110, $111 and $112 values are in mm/min. 1000mm / min is really slow. Approx 39in / min.

Are your step/mm values ($100,$101,$102) correct?

[dregalia]

Biggs, I think you're right there... Crap, forgot about that.. I need to boost those up to 3000 then and see how that works. Acceleration then will need to be tweaked a bit to compensate. Thanks! Let's see where that one takes me.