First of all, nice project. This could be a welcome addition to my current panel cutting rig.
One snag I’ve found though are the X/Y motors. The other custom parts are easily replicated, but the motors are not.
I’ve browsed the forums and even the GitHub for some days, but the specs seem to be vague.
In older posts i read about 300 ish ratio and later posts about 200 ish ratio. Knowing the rated speed would be very helpful.
The max torque is around 30KG and is quite high, can be traded for speed.
In GroundControl the steps/revolution, number of teeth on the sprocket and feedrate in mm chain/min can be set manually to adjust different motors.
I’m the wrong person to answer that. From what i seem to remember is that the encoder pulses is already more we need for accuracy. Current posts read that we are close to ~1mm and a gantry build is reporting ~0.5mm. Calculating chain-sack and chain stretch over length are not something that could be improved with more encoder-steps is my non engineer opinion.
Keep it coming! The one that took over spare parts does not deliver to my end of the world, so i would be the most happy to have an alternative if more of my motors gives up. (1 down, 2 running, 1 spare)
actually, at the top of the workpiece, we start running out of power (the ‘hook’
in a horizontal cut across the top of the workpiece is from the motor not
pulling hard enough and having to catch up at the end)
So my initial idea of replacing the 10 tooth sprockets with 25 tooth sprockets
won’t work (unless you adjust the machine dimensions so that the max force
needed is much lower than stock see the spreadsheet at
we currently are at >8000 pulses per 2.5", this is ~0.0003in (0.008mm) per
pulse, since our desired accuracy is ~0.05mm (1/64"), we could probably get away
with ~2000 pulses/rev with the current gearbox (or a sprocket 4x the size if we
had a motor with 4x the torque)
the one problem you may run into buying these motors is that there is one gear
in them that is very weak. When the Maslow suppliers order the motors in
quantity (say 3000 or more at a time), they get them with a stronger gear in
them than used to be supplied. We can’t know what you will get when you buy them
On my side this was solved with a 10A power supply and the TLE5206. With a 15kg sled at 8°.
With the TLE it was the first time to see a motor actually stall. Before it was just killing the original shield chips and/or the 5A power supply. I can’t calculate it, but i’m testing and observing for some time. straight-line-curves-down-at-top-of-the-sheet-solved
David, thanks for the additional info. That is quite a lot
I was already considering to increase dimensions a little bit since my build will use a brick wall instead of a wooden frame (further reducing cost).
Good to hear the official maslow motor will have a better spec gear soon. I’m trying to make an El Cheapo maslow CNC. My aim is 150 euro for a running machine, not sure if i will succeed at that, but I’m going to try anyway.