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[Illinoyance]

My friend keeps castrating bands and the spreader for that kind of situation.

[Illinoyance]

One thing to consider abut 5C collets is their versatility. I use them on the lathe. I have a Kalamazoo indexer that takes 5C, also a Hardinge style...

[Illinoyance]

I suspect the regular banding is due to imperfect mesh between the feed pinion and the rack. That would result in an inconsistent feed rate.

[Illinoyance]

I think it is an internal grinding accessory for a cylindrical grinder.

[Illinoyance]

Use a cutting torch to wash away the nut. If done carefully you can leave the threads on the stud untouched.