Bachin Stepper Motor 424015a Work [better] -

Incorrect phase wiring or a missing connection on one phase coil.

This will cause your machine to "mirror" its movements.

While an official datasheet is hard to find, the "Bachin 424015A" shares core specifications with other 42mm NEMA 17 motors. Here is a summary of its likely technical parameters.

Often fixed by using a microstepping driver (e.g., ) to make movement smoother.

To demonstrate the motor's operation, let's consider a simple example using an Arduino board and a ULN2003 driver.