Hi all, perused the forum and cant seem to find anything that’d help me get an atomstack r8 rotary to work with the gweike g2 pro. They both use a single usb connection but knew it wouldnt be that simple. I updated light burn to “turn on” the rotary and update the setting in the atomstack r8 manual, somehow i knew its impossible for these 2 to be plug and play… anyone have anyluck or will this require me to break these things open and do rewiring?
Both brands are misusing the USB-A port for something it wasn’t designed for, so there’s no standard.
Here’s a great method to find the stepper driver windings:
If you have the Gweike rotary, you can plug in the male USB-A into the Atomstack R8 Rotary female USB-A.
Turn one of the motors. If the wiring is the same, the other one will make the same rotation.
The USB-A rotary output of the Gweike G2 is wired 1-2 winding 1, and 3-4 winding 2.
This thread is related:
The Gweike G2 is using a TMC 2208 stepper to drive the external axis.
I’m using this X-axis from a discarded 3D printer as a linear table 
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thank you! I dont want to over simplify but could you check my understanding?
Assuming the resistance is the same as the linked post, i could:
1 - unplug 4 wires from the atomstack step motor driver (esentially bypassing the atomstack driver)
2 - splice that end into a male usb (either the same as the pic below or the outcome of my resistance resting
3 - plug into gweike g2
4 - update lightburn settings
i noticed that the motors on the r8 are different than the r6. this is a elemnetary question but would this affect the physcial compatiability or lightburn settings?
R8 - 42DNC420B-27D22
R6 - 42DNC420B-18D15
I feel like i may dumbing this down so i greatly appreciate your help!
My assumption is that this blue female USB-A connector goes straight to the stepper motor without a motor driver in between.
We will need to find out how it is wired.
I personally would just take it apart to see But use one of the other suggested options first.
- Measure with a multimeter,
- Short the pins and feel the resistance
The stepper driver inside the Gweike will be strong enough to drive either motor. Your R8 looks like it has some gear reduction or at least a redirection mechanism, so you will need to adjust the Steps per Rotation so that the Test button in the Rotary Setup spins the chuck exactly one revolution and back.
breaking it open looked more intimidating than it was but looks like both the r6 and r8 use a stepper motor driver with a femail usb connection.
Am i thinking this thru the right way? Pull out the wire connecting the motor to the driver and insert a new plug i made with one end 4 pin and the other male usb (wired to the diagram above) and hypotetically it should work then?
Oh, interesting! I didn’t expect that
Yes, absolutely!
The Gweike has the stepper driver inside the laser source, and the USB-A plug on their rotary connects straight to the motor windings.
Let us know when that worked