Jet-1236ps collet chuck

Albindf

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Can anyone help me identify the taper and thread pitch of the drive spindle for a jet-1236ps? I'm looking to get a 4 jaw and collet chuck for my lathe.
 
I had a 1980 Jet 12 x 36 back gear with 2 hp motor.Lathe-1236.jpg It had a 60mm x 8 tpi spindle thread. I no longer have the lathe but still have 2thread gages I made for making new backing plates since I couldn't find one with that thread any where. I didn't have money to buy a blank backing plate back then so the one shown was made from a barbell weight. I think I still have a manual for it would need to look for it. Let me know if yours has that thread.
4.jpg
8.jpg
I also have an Atlas milling attachment that I made an adapter plate for so it could be used on the JET. Worked great!
Walnut Charlie
AtlasMillAtt_1.jpg
AtlasMillAtt_8.jpg
 
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