1. ## cricut stepper motors

I am canniblizing a cricut machine (I think) for some stepper, but they dont have the steps/phase on them. the only numbers i see on them are
42bygh443808
cw no. 08.04.05n

Can someone help me find some information on these stepper??

2. how much wire on your motor? 4/6/8?

3. they are 6 wire motors, I think they are nema 17 case size, they are small but have a little bit of torque. I thought i might use them for a cnc hot wire cutter and to test out the tachus42 circut board im building. I have the whole machine in working order but to me it is a worthless POC now if i can couple this thing up to a pc cam program it might be of some value to me. It does have an interesting driver board, I should send it to pminmo so he can break it down........

4. tachus42 seem to be overpowered for your small motor.

did you already know is your motor is step motor or not?
if you don't know then you can start measure the resistance between every wire on your motor.

if your motor is step motor, you can test it to rotate with simple circuit.
since your motor is small, you can test with circuit on this link:
http://home.cogeco.ca/~rpaisley4/Stepper.html

remember, the circuit just for simple operation.

5. the tachus42 will be driving some 640oz motors later on, right now i just wanted to use the motors to do some tests of the cnc software and the driver.
the motors best i can find out are 44oz nema 17 1.8 deg 200 step possibly .8a . Not sure of the volts or amps though. I ohmed the coils ant they are 30 ohms each?? seems mighty high??
Being I have the controler for these motors I think i should be able to figure it off that? the supply voltage is 18v 2.5a just have to check out the resistors and figure it out.
Am I thinking correctly?

6. is these your measurement result?
wire#1 to wire#2 = 30 ohm
wire#1 to wire#3 = 30 ohm
wire#1 to wire#4 = 30 ohm
wire#1 to wire#5 = 30 ohm
wire#1 to wire#6 = 30 ohm
if that correct than I think your motor is damaged.

if you have 2 wires between #2 to #6 which resistance to wire#1 is 15ohm then you have 3 phase step motor.

stepper motor with 6 wires usually have resistance like these:
2 wires (of 6) should indicated shorted (that's center).
the rest 4 wires:
2 of them will have resistance, eg. 30ohm
but they don't have resistance to other 2 (open circuit)

7. no my ohms are
b to y 30 ohms
b to l 30 ohms
y to l 60 ohms
w to g 30 ohms
w to r 30 ohms
r to g 60 ohms
they are working unipolar steppers

8. Ok I checked the voltage going to the steppers and got 17.24v from each terminal to ground when the motors are on and locked up. Im not electronics person by far, but I will figure this thing out eventually. I thought I would see a voltage drop across the coil ?
The electroinics are set up kinda weird. they are nothing like the open source drivers that I have seen, the circut looks backwards as far as where the resistors are. would you do this in a chopper circut? the resistors are on the ground side of the coil after the mosfet......doubt anyone actually will repley but im putting it out there anyway.