for a BP series II Z axis drive? It would be an H series pulley (1/2"), but nobody makes a 13 tooth, I guess bridgeport had them made.

Try bptsrus on Ebay or maybe one of the race car drysump people weaver,stef's moroso ect. Would one off of a Boss6 work ?

I don't know when the z drive went from the knee to the head. I believe any mill that has the drive on the head uses the same 13 tooth pulley. I'll have to ask bptsrus if they have them.

Would one off of a Boss6 work ?

I couldn't properly explain to bpartsrus which pulley I'm looking for. Did you have a lead on one off of a Boss6? Anyone have any idea where I can find this pulley?

Unterhaus...
I had the same problem with my series I. The Z axis motor and pulley were missing. I bought a 10 inch piece of 13 tooth stock and made my own pulley with the taper lock hub like the other axes. I think I still have part of the piece if you are interested in making your own pulley..
Larry...

I don't know when the z drive went from the knee to the head. I believe any mill that has the drive on the head uses the same 13 tooth pulley. I'll have to ask bptsrus if they have them.

My Series I BOSS3 has the quill-mounted motor, but it uses a 26-tooth pulley...

Doh! I never thought of a 26 tooth pulley, wonder if it would fit. Larry, I definitely would be interested in the pulley material.

Thanks,
Eric

On edit, I looked at the mill. Clearly there was a 13 tooth pulley on there since the belt is slightly too tight with a 14 tooth. It's not clear that the belt would have clearance with the head for a 26 tooth pulley. Also, I've never figured out how to get that belt in there. Looks like you have to remove the spindle?

So, we drove ourselves nuts for a 13 tooth pulley........geesch....

ViperTX, in the process of driving yourself crazy, did you find a 13 tooth pulley?

In a BOSS 6 book the Z motor pulley is part number 12770133. Call Hardinge or a Bridgeport dealer and see if one can be obtained.

George