The higher the microstepping, the greater the chance of a skipped step. Setting it to a lower microstepping on a threaded rod makes sense. Probably about 1/8 microstepping threaded rod for a 1/32 microstepping belt comparison.
If I configure the driver to 1/8 the system will have enough resolution to make the tracks as fine as I need ?.
And another question, has anyone managed to make 0.15mm tracks without problems?
You MUST keep the pcb flat, probing speed has a great impact think of a car braking from 30km/h or 120km/h you might get different result if the pcb is bowed and not flat and the speed is high you get that variance. I myself use an Arduino Uno with CH341G and never had any communication issues, only the SPJS locking bug which I solved. I start probing at +0.5mm and stop at -0.5mm.
Yes. 8x gives you a theoretical movement of 0.0025 mm per microstep or 0.1mil. I doubt whether in reality your mill is precise enough to handle that repetitively but more likely with ball screws than anything else.
I recently read that at 32x you have only 5% of the holding torque that you would have at a full step.
At 8x you have 20%.
I think this was the article I read. http://hackaday.com/2016/08/29/how-accurate-is-microstepping-really/
Hi everyone, Thanks for the article, it is very revealing.
I have changed all the drivers, I have put the TB6560 started by 1/8 microstep and the thing has gone well and I have uploaded it to 1/16 microstep and it is better, at now I have to do more tests.
This is the change I made in the electronics
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All is temporary
This is the result, the left Z axis with TB6560 1/8 and X and Y with pololu DVR8825 1/32
To the right all axis with TB6560 1/16
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With the driver TB6560 makes me the very small tracks, I have to do more tests to see if I improve it
If I want more resolution I think I’ll have to put either a 400 step motor or a gearbox
A higher step per revolution motor will probably have less torque similar to how higher microstepping will have less torque, I think.
I am curious about the size of your stepper motors.
nema23 57BYGH115-003— 3A
Yes, but I want to make my prototype first, and if it works fine, I’ll do the job, thanks
you’re only 6/100s mm out from one side to the other. I rather imagine this is outside the practical resolution of your motors and drives. the theoretical resolution is 2/100mm. so at any point in time a given position could be +/- 2/100mm from the actual. and you are showing only another 2/100mm on top.
for practical purposes i’d say that the pcb is flat/true to the axis.
All I can say is that the next time it cuts too deep, make note of the depth that is reported. I am about betting that it reports that it is too deep. If so, that is the same boat that I am in when I try to use my CNC mill. I have been postponing trying again. It is annoying.
I understand that this is normal?