Posts made by JasonW

After switching to the new motors W3DRK recommended, everything work as they should now. Thanks a lot for the help!

Thanks W3DRK, its base on the MendelMax2.0, has been a great learning platform for mechanical design for me.

Anyway, I just ordered the new motors, should be coming tonight.

Will come back to report the result.

@dcaron:

JasonW,
From your information: 0.3 A Z motors, I assume you have very high resistance…..

Thanks dcaron, thats very detailed explanation. I will give the old parallel a try than.

@ShadowX:

Your Z acceleration seems a bit on the low side…

Yeah I purposely lowered that down, other wise the motors won't even move

Hi, I'm replacing Ramp on my printer with DuetWifi, and can't figure out what the problem with the two z motors.
The motors I'm using on Z axis are these https://www.sparkfun.com/datasheets/Robotics/SM-42BYG011-25.pdf.
Z motors are installe in series using ZA and ZB, but when I try to move the Z axis, one or both of the motor will get stalled in the middle of the move as shown in the video.
https://youtu.be/CgomwPnl_VM

Here are my setting for now :
[c]M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80 Y80 Z1600 E460 ; Set steps per mm
M566 X900 Y900 Z3 E300 ; Set maximum instantaneous speed changes (mm/min)
M203 X12000 Y12000 Z300 E1500 ; Set maximum speeds (mm/min)
M201 X1000 Y1000 Z5 E10000 ; Set accelerations (mm/s^2)
M906 X1200 Y1200 Z1800 E1000 I30 ; Set motor currents (mA) and motor idle factor in per cent[/c]

I also tried lower the Z current down to 300 since that's what the motors are rated for base on the data sheet, but the same problem still occur.
When I swap one of the Z motor with Y motor, which are much bigger, the Y seems to move in a jerking way, and the torque is close to non exist.
Almost seems like the two motors on Z driver are interfering each other.
They works fine if just one of them is connect.
The only other thing I can think of to try is to lower the Z motor moving speed when using the interface, but I have know clue where to edit that.
Anyone have any idea about what might be the cause? Thanks!