Stepper Motor acts erratically

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hi new forum , looking stepper motor. have uno cnc controller board , pololu a4988 drivers, using cnc program.
i have nema 17 motors working correctly software , no problem when connect 28byj-48 (12v , 5v, tried both) steppers run in direction , not consistent. have changed them 4 wire bipolar normal unipolar configuration. resistance on nema 17 low, 10ohms resistance on 28byj 180ohm or 350ohm depending on one.
i these small steppers working project small lathe , mill cannot support nema 17.
any appreciated. have both modified steppers , unmodified ones try.

bignbad, can tell first time. please provide code. not give unnecessary info. sounds working 2 projects. nema 17 motors , smaller 28byj. start on posting code. give 1 example @ time. there great examples out there basic 28byj setup. use sample , modify there. verify wiring ok. seems trying use small of stepper lathe , mill project. nema 17 motors run small machine.


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > Stepper Motor acts erratically


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