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  • MichaelD527 followed Electronics, CNC and LEDs channel 2 weeks ago
  • Medium sized DIY - CNC 20" x 30" work area

    If you are encountering stalls with everything in place, then the problems I discribed are happening. The ball screws are close enough to the rotational axis that they are not providing the angular momentum to keep going. The disk should be at least the diameter of the motor, and larger may help. This is a cut and try attempt to smooth things out. There are drivers that electronically compensate for this, but I don't think any of the Chinese stuff is that sophisticated.

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  • Medium sized DIY - CNC 20" x 30" work area

    Hello,I'm a retired ME and used stepper motors on many projects. There are some things people should know about them. First they are strongest when sitting still, when moving the stater poles are excited which makes the rotor jump to the next position. Think of this action as being controlled by magnetic springs, so at certain frequencies, the rotor jumps, is restrained by magnetic flux, and slightly oscillates back and forth. When the speed and load combine with this effect, the motor will loose torque and go into an electromechanical dither and stall. Micro stepping helps but all steppers have this weakness. A possible "fix" or at least help is to add physical inertia to the motor shaft by installing a metal disk that adds rotary mass to the operation. You may have to...see more »Hello,I'm a retired ME and used stepper motors on many projects. There are some things people should know about them. First they are strongest when sitting still, when moving the stater poles are excited which makes the rotor jump to the next position. Think of this action as being controlled by magnetic springs, so at certain frequencies, the rotor jumps, is restrained by magnetic flux, and slightly oscillates back and forth. When the speed and load combine with this effect, the motor will loose torque and go into an electromechanical dither and stall. Micro stepping helps but all steppers have this weakness. A possible "fix" or at least help is to add physical inertia to the motor shaft by installing a metal disk that adds rotary mass to the operation. You may have to experiment and make your own, 1/8" thick by 3-4"dia is a place to start. The added inertia helps the rotor break through through and continue to turn

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