# Y axis moving in the wrong direction during setup

Hello all, i’m new to this sport and my y axis is moving in the wrong direction during setup. here is the grbl parameters

\$0=10 (step pulse, usec)
\$1=255 (step idle delay, msec)
\$4=0 (step enable invert, bool)
\$5=0 (limit pins invert, bool)
\$6=0 (probe pin invert, bool)
\$11=0.020 (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=1 (homing cycle, bool)
\$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=790.000 (x max travel, mm)
\$131=790.000 (y max travel, mm)
\$132=100.000 (z max travel, mm)

The grbl parameters are correct for the wiring as stated in the assembly directions.

Go back and check your wiring for the Y axis. Start by making sure that the wires are hooked up to the gShield properly.

Or you could change your grbl parameters and run a non-standard setup.

thank you, new to this and don’t have a clue. will check my wiring!

My thanks to LarryM. Yeah I had the year axis wires reversed. Fixed that now the next problem, my z axis is binding at the top of the travel during homing actually come to a stop and alarms! Any ideas? Should I put some lube on the screw (acme)?
Thanks greg

Are you sure it’s binding, or are you getting a false trigger?

Did you use shielded wire for the homing switches?
Or, did you put low pass filters on the homing switch connections to the gShield?

I used the wire that came with it. The reason I think it’s binding is because it moves smooth until it gets near the top then it slowly comes to a stop, the motor is still trying to move it

M8 or ACME screw.

Watch the bottom of the screw when you move the Z axis with the motor to see if the screw is bent. If it is bent, then the bottom of the screw will wobble around as it turns. Some movement is normal because the bottom end is not supported, but a lot of movement would indicate a bent screw.

Did you do the drill exercise with the screw and delrin nut that was recommended in the instructions?

I took the z axis apart checked the Acme screw doesn’t seem to be bent. Rolled it on a table top no wobble. I’ll try the drill now. Thanks for your time.

You might want to get some dry lubricant for the screw. Don’t use oil or similar products as they collect debris.

I think I figured it out. Even with the lube on it it still stopped. I backed off on the lock nut and it worked perfectly! Thank you again
Greg