X Axis Moving To Far

First off I just wanted to thank the Inventables team for the excellent support while ordering my xcarve!

So I finished my X-Carve over the weekend and have spent the entire week trying to get it to make a 5 inch circle. Every time I have to stop it early to prevent the x axis from over traveling.

I finally noticed that even when jogging, the X axis moves way to far. The Y and Z axis will move 1 inch or mm depending on which is currently set however the X axis always jumps roughly 4 inches, even when the other two are only moving 1mm as expected.

I also noticed when jogging the x axis to the left, the led next to the X axis on the gshield goes off. When I jog it to the right it will come back on.

Here are my settings.

$0=10 (step pulse, usec)
$1=255 (step idle delay, msec)
$2=0 (step port invert mask:00000000)
$3=3 (dir port invert mask:00000011)
$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=0.020 (junction deviation, mm)
$12=0.002 (arc tolerance, mm)
$13=1 (report inches, bool)
$20=0 (soft limits, bool)
$21=0 (hard limits, bool)
$22=1 (homing cycle, bool)
$23=3 (homing dir invert mask:00000011)
$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=40.000 (x, step/mm)
$101=40.000 (y, step/mm)
$102=188.976 (z, step/mm)
$110=8000.000 (x max rate, mm/min)
$111=8000.000 (y max rate, mm/min)
$112=500.000 (z max rate, mm/min)
$120=500.000 (x accel, mm/sec^2)
$121=500.000 (y accel, mm/sec^2)
$122=50.000 (z accel, mm/sec^2)
$130=290.000 (x max travel, mm)
$131=290.000 (y max travel, mm)
$132=100.000 (z max travel, mm)

Belt and current settings have been adjusted. Moves easily without binding.

Any suggestions? Y and Z seem fine but X is always moving way to far. Thanks in advance for the help.


First, check the micro-stepping on the gShield. The Z-axis should have a jumper on and the X and Y axes should not have any jumpers on.

At the gShield, take the X-axis wires and install them in the Y driver sockets. Take the Y-axis wires and install them in the X-axis driver sockets.

Run your test again. Does the problem stay on the X-axis, or does the problem move to the Y axis?

Just tried and the problem moved to the Y axis. X now works as expected. Jumper is correct, there is only one and it is on the Z axis.

Also noticed that the movement is not smooth when starting and stopping. Almost a harsh stop and start. It was also previously doing this on the X axis.


This is usually caused by a bad gShield driver chip. Get in touch with Inventables to see if they agree. Most likely they will replace the gShield for you.

That’s what I was afraid of, thanks for helping confirm this. I will contact Inventables in the morning.

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