Bed levelling (G32 S3) skips the final move and probe

fcwilt

Hi,

Thanks for the explanations.

Frederick

gtj0

OK so now the moves are completing but the correction never converges. The leadscrews are being adjusted but they keep moving in the wrong direction. I'm wondering if the adjustment magnitudes are correct but maybe the signs are being applied backwards.

Leadscrew adjustments made: -0.052 -0.252 -0.448, points used 3, deviation before 0.285 after 0.000
Leadscrew adjustments made: -0.030 -0.427 -0.819, points used 3, deviation before 0.506 after 0.000
Leadscrew adjustments made: 0.008 -0.773 -1.562, points used 3, deviation before 0.948 after 0.000
manually moved leadscrew 1 to bring the bed further away from the nozzle.
Leadscrew adjustments made: 0.051 -0.813 -2.292, points used 3, deviation before 1.317 after 0.000
Leadscrew adjustments made: 0.149 -2.160 -4.496, points used 3, deviation before 2.705 after 0.000
The bed is quite tilted now.

T3P3Tony

@gtj0 i think @kraegar had this working

kraegar

@gtj0 If your leadscrews adjust in the wrong direction the most likely thing is that you have your stepper wires in the wrong ports. Pay careful attention that:

your leadscrew definition is the the correct order for your driver connections
and
your leadscrew location definitions match that order.

For mine my leadscrews are arranged like this:

1
          2
0

and are plugged into drivers 2, 3, 4 so my config is:
M584 X0 Y1 Z2:3:4 E5 ; Map X to drive 0 Y to drive 1, Z to drives 2, 3, 4, and E to drive 5
M671 X-10:-10:283 Y22.5:227.5:125 S7.5

Also note the drivers on the duet3 are in this physical order
0 1 2
5 4 3

Hope this helps!

gtj0

Duh. The first and third motors were reverse. I'm going back to bed.
Thanks @kraegar !

gtj0

Are you guys upvoting the fact that I'm an idiot???

fcwilt

@gtj0

Nope - we are just glad to hear you got it working.

We've all made foolish mistakes from time to time.

Frederick

kraegar

I knew what it was right away, because I get this exact question on our printers about twice a week or so. It's an easy mistake to make!

gtj0

Actually, when I was mounting the Duet3 I made a mental note that the drive connectors were ordered clockwise from the top left. I just couldn't find it when I was hooking up the connectors.

T3P3Tony

@gtj0 nope, just adding to your karma