My Squares are rectangles and my circles are oval

LightBurn Software Questions
1

Hi: First, I haven’t contacted you in a while because things have worked so well. I seem to be having an XY calibration issue.
I am calibrating to a 2x2 square through the machine calibration. I am getting 1.26 inches on the Y and 3.1" on the X. I put in the actual calibrations and hit write. It said it was accepted, however the result is still a rectangle.
I also went in and turned the rotary off, because thats what the OM tech forum said to do. Doesn’t seem as if the calibration adjustments are taking.
What might I be missing?

Thanks
Jay Thorpe

2

You can goto Machine Settings (edit > machine settings) and then Calibrate Axis.

From there you can calibrate exactly what you want.

3

It would have be a lot more fun if your circles was rectangles and your squares was circles :slight_smile:

Anyways, one of your axis have probably a wrong step/mm settings or both…

4

Hi I already recalibrated, through machine settings and put in required vs actual. The software said it took the calibration, but the end result is still the same. Rectangles. Any other thoughts would be appreciated.

5

Thanks DzzD: I understand how to recalibrate the machine settings however, how do I address the step issues, or where do I look to better understand that? Thanks Jay

6

Steps per mm define how many steps your motor must perform to move the head 1 mm from its current location, it is common in CNC. It has to be defined per steppers motors.

Example : if your motor have to make 200 steps to turn 360° (make a full rotation) and if one turn of your motor move the head 8mm (or any other motion system), this means that your step/mm is 200/8 == 25, this means that when your motor make 25 step it move 1mm (could be x,y or z or anything else that move).

I dont know what board or firmware you are using but probably this link shoould help : GRBL Steps Per mm - How to Fine Tune Your Settings

In console type $$ and look at :
$100
$101

I think you have to redefine those values (it can be necessary when you change a belt that have different tooth spacing, or a lead screew with a diffferent thread etc…)

EDIT: thie one maybe a bit better GRBL Settings and Calibration – 3D Tech Works

7

I would like to confirm that you have a Ruida Controller.

If you make changes with Machine Settings in LightBurn, you may wish to start with a fresh “Read” and end with “Write”.

There is a step in enabling and disabling rotary mode with a ruida controller that requires power cycling (From on-to off-back to on) the controller to get the rotary mode to enable or disable.

If rotary has been used recently (or ever) it may still be fouling you up.

Please confirm the steps in the bottom note at the link below have been applied to the rotary mode before proceeding with axis calibration.

8

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