HP Laserjet II/III - STEPPER Shaft

[Rance]

I finally got a round to extracting the Stepper from my HP Laserjet II/III. The motor has a spiral gear on it. How have folks connected to this? I'm guessing that since a flexible tube will be connected to this that it won't be a problem but was wondering what others have done. I guess a FLAT could be filed into it as well for installing couplers such as a Lovejoy. Your thoughts? Thanks.

Rance

[joecnc2006]

Originally Posted by Rance I finally got a round to extracting the Stepper from my HP Laserjet II/III. The motor has a spiral gear on it. How have folks connected to this? I'm guessing that since a flexible tube will be connected to this that it won't be a problem but was wondering what others have done. I guess a FLAT could be filed into it as well for installing couplers such as a Lovejoy. Your thoughts? Thanks. Rance

Don't forget they are not a standard 1/4" chaft.

[KrashKing405]

You got model numbers for that stepper? I pulles a couple out of some HP printers myself.

[HayTay]

KrashKing405,

You got model numbers for that stepper? I pulles a couple out of some HP printers myself.

Check this out, I put this together a year or so ago when I was getting my HPLJ-II/III/IID/IIID stepper motors running:

HP LaserJet II/III/IID/IIID Main Motor Specs

That should get you going in the right direction.

Let me know if anything needs to be added or changed (and why),

HayTay

[KrashKing405]

Where did you get the wiring diagram? I got the data sheets for the steppers I have, but they didn't have a wiring diagram.

[HayTay]

Where did you get the wiring diagram?

I figured it out using a circuit diagram from an HPLJ-II/III Service Manual, verified it with a mulit-meter, tested it with an open source driver circuit, and currently have them wired to a 4-axis Xylotex unipolar driver board (now discontinued) to power my JGRO table. Whew, that was a mouth-full.

HayTay

[KrashKing405]

Where can I get service manuals?

[Rance]

That's STILL a good reference HayTay. Hey, how did you address the spiral gear on your steppers? Maybe add that to the doc? Thanks.

Edit: Forgot to mention, you can figure out any stepper wiring yourself using www.doc.ic.ac.uk/~ih/doc/stepper/others . Enjoy.

[vacpress]

ive used these steppers on a few things... i ground a flat onto the spiral gear shaft to allow a set screw to have a better bite. i ended up with multiple step screws on each coupler. this is to counteract the tendency for rotation to 'ride' the spline of the gear and come off.. this was especially irritating on a 'Z Axis'

[HayTay]

Rance,

The motor has a spiral gear on it. How have folks connected to this?

That's STILL a good reference HayTay. Hey, how did you address the spiral gear on your steppers? Maybe add that to the doc? Thanks.

You, and everyone else, are very welcome! I'm glad I could help.

Here's how I connected the 1/4"-20 threaded rod to my HPLJ-II/III/IID/IIID stepper motors:

I picked up some 1/4"-20 coupling nuts for connecting a piece of threaded rod to another piece of 1/4"-20 threaded rod, bolt or screw and some 5/64" x 1/2" steel roll pins. The roll pins are also called spring pins by some manufacturers. Buy a few extra, they're cheap. I got the coupling nuts at Lowe's or Home Depot and the roll pins at my local ACE Hardware.

Instead of a long-winded explanation see the attached pictures. Don't do like I did, though, and drill the holes through the coupler and threaded rod and spiral shaft by hand and eye. To make the drilling and subsequent alignment more accurate, use some scrap wood/MDF to build a fixture to hold all three components together and perpendicular to the motor and the drill bit.

If anyone needs/requires further explanation or clarification I will be happy to provide it.


Many happy couplings,

HayTay

[High Seas]

Hay Tay - WELL DONE and Thanks for sharing That! You've moved me closer to my next assembly - now if there was just a little more time.....
Jim

[Jason Marsha]

Great Job HayTay thats a fast cheap way to do it.

For those who want to use a coupler like Lovejoy or similar, check the motor shaft to see if its a 6mm shaft (1/4" = 6.35mm). There are couplers available where 6mm may be chosen for one side and 5/16 may be chosen for the other .

Jason