Limestone turntable, help needed with motor and drive

[Drbulj]

Your acid idea is a definite possibility; Revox/Studer tape machines had an etched capstan and I remember local radio engineers talking about dipping their shafts in drain cleaner to restore that slightly rough finish.

Hi EC, and everybody else, any suggestion about process to get aluminum surface more frictional to get equal rough finish?

 

[EC8010]

Drain cleaner? Not a terribly good suggestion, but the best I can think of. I assume you're thinking of your motor pulley?

 

[Drbulj]

Yeah, motor pulley, clean and polished aluminum, but I will try on other piece first 🙂

 

[EC8010]

Yes, use a test piece first. I've never tried drain cleaner and the method was mentioned to me at least thirty years ago.