Need help with a Eight wire stepper

[woodturn]

Hello out there, I have an old Dyna bench top VMC that I trying to get going here and I need to replace the drivers. When I opened up the machine I noticed that there are eight wires on the steppers. By the way the stepper are Made by the Minebea Co. No. 310-6. There is also a name on the stepper called "astrosyn" I am not sure what that means.

Anyway, my question is...Will a xylotex three axis driver board work? and how do I hook up 8 wire into a 4 driver board?

Some more info. There is no resistance between the....

orange and red
brown and yellow
green and blue
Black and white

thanks

dave

[Konstantin]

An 8 lead stepper you can wire pretty much anyway you like, as unipolar u are going to have to figure out which leads will be the commons and as a bipolar either in series or parallel.

Skip to the wiring info in pdf documents.
http://www.sdp-si.com/D790/HTML2/D790C14026.html
http://www.solarbotics.net/library/p...f/motorbas.pdf
http://www.ams2000.com/pdf/step101.pdf

You may have to find out the order of the coils with a battery if you cant find the specification sheet for that motor.

To answer your question you will have to wire the coils (by joining ends) either parallel or in series, refered as Bifilar wiring and you will end up with 4 leads total.

I believe any type of 2 phase stepper drive (bipolar or unipolar) will work with this motor provided you are in the A/phase rating of the motor.

Konstantin.

[woodturn]

Thank you very much, it looks like I have some reading to do.
Does anyone know where I can find the specs on the my stepper?

Again Minebea Co. 310-6

thanks
dave

[Konstantin]

Finding specs of an old/discontinued stepper is fairly routine task amongst cnc hobbyist that salvage the motors from whatever source. You could contact Minebea for those, I wish you luck.

Apparently sometimes manufacturers produce steppers under a license or agreement for another company in which case the responsibility to have the specifications is on the latter company.
And generally speaking it is a mess.

If you ever find the specs for your motors don't forget to post them in here.

I bet you could map out the leads with a 9v battery faster that you will find the specs of the internet.

Konstantin.

[woodturn]

sounds good, however, I do not know what I am doing when it comes to running the leads off a 9v battery. Could you give me some insight on how to accomlish this goal.
Thank you again
dave

[Konstantin]

I guess write down on a paper what coil leads do you have, then:

apply current to a coil
apply current to another coil while the first coil is energized
note the direction change if any
take notes
disconnect the second coil and try others until you find the adjacent coils to the first one.

Something like that I think.

Here you need to have 2 things,
the order the coils
the correct hook up of the coils
... so if you apply the current starting from coil 1 to the 4 you will get the motor continuously spinning in CW or CCW direction.

Konstantin.

Alternatively check your old setup, maybe it will give you enough clues about the leads wiring.
Another way is to google the web for stepper with the same color leads and try that, the coloring sometimes is standard.

[b5n7i2o5]

Is that you Dave? The Dave from EHS Eureka? Thought I would just say hi.

[woodturn]

Yea buddy thats me alright, just trying to make sense of the whole thing!