Help with stepper/driver needed (low holding torque?)
Hello people.
Bought a laser cutting machine, xy gantry, nema17 motors, M415DRV drivers.
Trying to debug very small oscillations happening while travelling at speed.
Gantry and head driven by GT2 belts on your usual pulleys for that sort of thing. Think 3d printers.
Usual speed for cutting paper card is 200-300mm/s, where i see small sinusoidal waving in the
produced cut, always at opposite sides of, say, circle.
Engraving in X at 400mm/s does well (tiny Y steps), but as soon as wide vertical motions are introduced
i get waving in the cut. And sometimes step loss in Y direction.
Checked mechanics, no binding or sticking.
I'm thinking i may need to increase current to the motors to see if waving goes away with more torque.
Cannot identify steppers to see their specs (china, right?).
Markings on motors:
X axis (head motion): Type 17HA705Y-1A, FH171215 Smooth (shorter motor, single shaft)
Y axis (gantry motion): Type 17HA801Y-22P5, FH190104 Smooth (taller motor, dual shaft)
Google-fu fails me on this.
Same with drivers, cannot find M415DRV as such. I did find M415 but those have 6 switches on them, mine got 8.
On my drivers switches 1 and 4 are ON. How do i increase current ? What switches to pull ?
Re: Help with stepper/driver needed (low holding torque?)
I didnt, it came from the factory this way.
I suspect motors bouncing on direction changes, which (in my limited understanding) suggests not enough holding torque/current.
And as i cant identify the motors, i dont know their amp range. Driver label seems to suggest max IT can do is 1.6A.
#Edit# Only switches 1 AND 4 are in ON position. 2 and 3 are OFF.
Re: Help with stepper/driver needed (low holding torque?)
Running torture test at the moment. Loaded a complex design and let it run with laser off.
About 15 minutes of very small movements, sudden direction changes. Dont know if its losing steps, just want to see if motors get warm/hot on default settings.
#Edit# Results. X motor (head) about 40C, Y motor is 20C, ambient about 18C. Thoughts ?
Re: Help with stepper/driver needed (low holding torque?)
Starting to get a hang of this.
Will change to 0.57 and test again.
Here's another question - what does microstepping decrease do to torque ? I'd assume it will increase torque and travel distance (if not corrected in controller software).
Am i correct ?
Re: Help with stepper/driver needed (low holding torque?)
Increased current to 0.57A
Ran the torture test again. Twice in a row.
Results:
X is burning, 65C
Y, stone cold.
While X is a shorter motor, both motors do about the same amount of moving yet X is getting a bit close to 80C, while Y is sitting there just yawning. Never seen stepper to heat up so much on any of my other devices with nema17 motors...