Use U-Axis as Rotary on Ruida RDC6442G

[psahgks (Lutz)]

Hello there,

i recently bought a used red-and-black 60W-CO2-Laser with a Ruida RDC6442G-Controller.

I bought Lightburn right away and i am very pleased using it. Great Tool. (

My laser has two Stepper-Drivers and i have to plug in the Steppermotor of the Rotary in the Y-Driver everytime i want to engrave something round. Common thing, i believe…

Because i ran into some minor issues while changing back and forth between Rotary and Y-axis and i just dont like plugging in and out all the time i bought a third Stepper-Driver and connected it to the U-Axis-Connector on the Controller.

So far so good, i can easily control the Round-Axis as the U-Axis in the Controller-Display while having X and Y in use simultaneously.
But then i unfortunately realized that i simply cannot use the U-Axis as Rotary-Axis in Lightburn when using a Ruida-Controller.

Why is that so? And is there any chance to get it working?

Sorry if that has already been asked, didnt find anything on that matter.

Greetings from northern Germany,
Lutz

[Lignumaqua (Mike Wood)]

The endless quest for rotary engraving on Ruida 6445g

This is what works for me with V15.01.22 and the rotary connected to the U axis. Enable rotary in Lightburn Use ‘Start from current position’ in Lightburn Jog x and y on the Ruida to move the laser to the required starting point on the work Press ‘Origin’ button on Ruida Send job from Lightburn to Ruida Run job by pressing start button on Ruida. Step 4 is the key to success.

[jkwilborn (Jack Wilborn)]

Did the @Lignumaqua fix work for you?

I just did my first rotary job yesterday and have thought about using the u axes for the rotary.

Thanks…