hey forum!

this is my first post on this website, i made an account hoping to get some insight on basic principles of cnc machines. i've started a project making a 3-axis cnc out of 3 old floppy drives. mostly to learn about controlling and circuity.

the motors in the floppy drives have four wires, wich leads me to think they're bi-polar.
however since im quite new to stepper motors, i came across some difficulties.
i tried figuring out the wire pairs by measuring resistance from the two phases of each of the coils. however i keep measuring infinite resistance no matter where i connect my multi meter.

ive also hooked up my power supply to the motor. its a 5v-dc motor so i hooked up positive and negative to the motor wires in all possible combinations. i heard somewhere this would either make the stepper buzz or move a single step every time you apply current.

could anyone tell me how to test if my stepper motor works?

i plan to later test them by controlling them with an arduino microcontroller and a simple circuit, before i start thinking of actual Drivers.

i'd also like to make my own driver, i heard bi-polar drivers are more complex than unipolar ones. my knowlege on electronics isnt too bad, so if anyone could direct me to a simple bi-polar driver circuit with IC's that i can find datasheets with, i should be able to get an idea of how it all works

the driver can be really simple, i don't mind if it doesnt drive my stepper optimally, it's all about getting a general beginners idea of drivers and steppers. ill move on to bigger and better things in time

thanks for reading!