In other models I see they sometimes use trapezium spindles for X and Y movement.
I suppose accuracy would imporve a lot but I’m afraid printing would become slower.
What would be a good spec for such a spindle (TR10x3).
Any advice, or did someone made this modification? ( I searched forum, but I find only Z axis improvements )
I don’t see this working unless being extremely slow like you said yourself… If I make my Z-axis move all the way up with trapezium spindles (10x2) it takes quite a long time. if your build table has to run at this speed I think it would take forever to print anything…
Where did you see a printer using this for the x/y direction if I may ask?
NEMA17 steppers seems to have a max. speed of 2000RPM.
see motion.schneider-electric.com/pr … ema17.html
With a TR10/3, this would mean ±33 rotation/sec or about 10cm/sec.
You would get an accuracy of 3/200 = 0.015mm for 1 step.
Or do I make a mistake here?
For the example, I cant find it immediately, I will try to look it up. I thought it was a model with a “floating” extruder whcih had 3 spindels.
Hi schoenmaekers,
[quote=“schoenmaekers”]NEMA17 steppers seems to have a max. speed of 2000RPM.
see motion.schneider-electric.com/pr … ema17.html
With a TR10/3, this would mean ±33 rotation/sec or about 10cm/sec.
You would get an accuracy of 3/200 = 0.015mm for 1 step.
Or do I make a mistake here?[/quote]
maybe you do, at least you did not take the drivers into the equation.
Marlin’s default max step frequency is 40 kHz, so the max rpm on the motor depends on the microstepping:
MS x16, FS/s 2500, rps 12.5, rpm 750
MS x32, FS/s 1250, rps 6.25, rpm 375
MS x8, FS/s 5000, rps 25, rpm 1500
… and so on. MS microsteps, FS fullsteps
At 3 mm pitch and 1:1 gear ratio (i.e. direct drive), that would be 37.5 mm/s (F2250) for x16, with about 0.9 µm resolution per (micro)step. However, friction has to be low, otherwise the motor torque won’t be enough to drive the spindle at those speeds.
Cheers,
kuraasu