MPCNC, X and Y scale adjustment using SKR PRO V1.2

Mostly Printed CNC - MPCNC Advice
1

I am newbie and having an issue with the X and Y scaling. I carved a 50mm x 50mm square and the MPCNC generated a 62mm x 62mm square. I am not sure how to fix this. I am using SKR PRO V1.2 with the firmware that came with it.

A few pics…

MPCNC Pic1
MPCNC Pic11920×1440 156 KB

MPCNC Pic3
MPCNC Pic31920×1440 308 KB

gcode I am sending…

G21
G90
G1 Z3.810 F228.6
G0 X52.000 Y52.000
G1 Z0.000 F228.6
G1 X49.252 Y52.000 Z-1.000 F228.6
G1 X2.000 Y52.000 F812.8
G1 X2.000 Y2.000 F812.8
G1 X52.000 Y2.000 F812.8
G1 X52.000 Y52.000 F812.8
G1 X49.252 Y52.000 F812.8
G21
G90
G0 Z3.810
G0 X0.000 Y0.000
G4 P0.1

Please let me know how I can get the scaling corrected.

Thanks,
Tehmosp Khan

2

Is this a new build? Either you have the wrong size drive pulleys (20 vs 16) or your mm/steps settings are off. I would bet on the former, but you could compensate by adjusting the latter (although buying the correct pulleys would be a better choice IMO).

3 Likes
3

Thank you Bartman, I have ordered the 16 tooth pulleys, and I will give them a try. Keep you posted of my results.

Tehmosp

1 Like
4

Bartman,

The 16 tooth pulleys came in and I tested them out. This fixed the scale.

Thanks for your help!
Tehmosp

MPCNC Pic4
MPCNC Pic41920×1440 238 KB

4 Likes
5

I read that as thank you BATman! (First try!)

images
images213×165 4.95 KB

6

Glad to hear that your problem is fixed! You may want to select my post as a solution, so that future users with a similar problem can find the answer quickly.

2 Likes