My Ford Super 7 Countershaft Balance

Has anybody had any issues with the balance of the countershaft/clutch assembly

I have no vibration from the motor on its own (3phase Newton Tesla) but when I put the belt to the countershaft on but with the belt to the spindle off there is vibration

The large pulley on the clutch appears to be out of balance. Ie place it in one position and it will move round on its own always stopping in the same spot

The problem was much improved when fitting the 3phase motor but the vibration is still there

Thanks for any help or ideas on how to balance it

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.

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

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

2 clutches were used on the S7 the early moped front brake and the later cone clutch. I would check that the clutch unit has not gone out of balance before trying to balance the pulley. Noel.

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

If the vibration is there before engaging the clutch it should mean that its the clutch driven pulley.I have just looked at mine and there are balance drillings on the back which you can see with a mirror and torch.

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

Ive never had any vibration problems with my S7 in single phase mode or 3 phase so it could be belt induced.

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