Jon, regarding spare 6r collets, please take a look at my post where I list my extras and what I'm missing to see if any I need any of your extras.
Jeff in long beach
Ps. I thought you got a mix of hardinge and rivett?
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It's not super clear from the drawing if this bearing should have the retaining ring or not, can anyone clarify please?
I found bearings for my Rivett at EZ Bearing LLC. I talked to Darrel. Locate Ball Bearings also has these bearings and can save you money, but I’ve found that you need to be sure to check their condition.
I recommend setting the drive up on sawhorses, installing everything, hooking it up to electrical controls and running it there. It is much easier to adjust brake clearances and clutches while on stands. Also, I ended up having to reface my Reeves pulleys to eliminate a slight warpage. That required rebalancing. When you get everything they way you want it, pull it apart and repaint it. I installed my drive with a forklift.
The magnetic brake can be quieted if you regrind the magnet faces. Also, the Rivett’s Reeves drive is sensitive as to the brand of variable belts. It required four different ones before I found one that was both smooth and quiet. If you want, I can check what I used as I don’t recall it right now.
note, all of the gears through out this machine look to have very little to no wear, which has me questioning the reasoning for a full disassembly
This was Carl Cederstrand's lathe? If so the reason the headstock was disassembled is because the iron casting inside the headstock was broken and he had to repair it.