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
Hi everyone, I still have problems, this can not be right, the pcb is placed on the cnc table and it is balanced and you can look at the uncontrolled sounding measurements, I’m lost step?
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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?