So-called ‘Static Balance’ is relatively simple to check and adjust

Mount the pulley on a plain shaft and set it on a pair of parallel knife-edges

Edit: __ this illustrates the concept, on a smaller scale

https://clocksavant.com/blogs/news/watch-timing-and-accuracy-static-vs-dynamic-poising-balance-wheel-poising

When it settles: Remove material from the heavy spot [or add weight at the top]

Repeat the process until it settles in a different orientation every time you disturb it.

MichaelG.

.

Dynamic Balance [like the tyre shop does] is, of course, more difficult.

Edited By Michael Gilligan on 19/04/2023 17:21:28

Is it possible, please, to correct the thread title so that it can more easily be found in future?

When I got my new s7 (1982) I too had bad vibration. It came from the primary drive belt whipping. A call to myford and it seems this was a common problem which they couldn’t test at the factory cos in those days the lathe came with no motor, chuck or much else! It was completely cured when they supplied a brammer line belt which I used until fitting a vdf and 3 phase 25 years ago, when the motor drive pulley diameter was changed to stop excessive motor speed and vdf frequency with high speed turning

Some v belts are fatter atb the join, and this can produce vivratiob because of the join riding furtherv out in the V .

Maybe a change to a better belt might cure the problem?

Howard