It's possible I haven't been getting great micro-stepping and this is adding to the vibration. The G3D stepper drivers that I use include a voltage pot and also a separate 30K trimpot, described this way: "turned fully counterclockwise pulls the ROSC pin to ground, turning it clockwise lets you to choose a reference. By pulling the ROSC pin to ground, mixed decay is set to be active 100% of the time, for both rising and falling currents, and prevents missed steps. If this is not an issue, it is recommended that automatically-selected mixed decay be used, because it will produce reduced ripple currents. Refer to the Fixed Off-Time section for details."
I found that the full counterclockwise position was giving too much vibration. I was able to reduce the vibration a little by setting it about 180° clockwise. The E motor still hums a bit, so I'll probably tweak that also. Neither motor is as quiet as my previous set-as-unipolar motors, but they're reasonable. Still, I might revert to the old motor on the Y axis since there doesn't seem to be any added value with this new motor.
Are there common stepper motors out there that have a good torque range and micro-stepping but just aren't very well suited to RepRaps because of their electrical characteristics? Obviously my new motors are within the range of the Vref pot on the driver, but in a slightly higher voltage range. Should I favor the old motors on the basis that they're (a) quieter, (b) require less current, and (c) have plenty of unipolar torque? On the other hand the new motors are a bit prettier than the old ones.
I found that the full counterclockwise position was giving too much vibration. I was able to reduce the vibration a little by setting it about 180° clockwise. The E motor still hums a bit, so I'll probably tweak that also. Neither motor is as quiet as my previous set-as-unipolar motors, but they're reasonable. Still, I might revert to the old motor on the Y axis since there doesn't seem to be any added value with this new motor.
Are there common stepper motors out there that have a good torque range and micro-stepping but just aren't very well suited to RepRaps because of their electrical characteristics? Obviously my new motors are within the range of the Vref pot on the driver, but in a slightly higher voltage range. Should I favor the old motors on the basis that they're (a) quieter, (b) require less current, and (c) have plenty of unipolar torque? On the other hand the new motors are a bit prettier than the old ones.