Hi Rapadura
Of course it will not swing forever,I wish,there is air friction for one thing,the biggest prob. is lenz drag on a coil,it always seems to come down to that!! but a friction free fulcrum is a start.
peter

Quotethe biggest prob. is lenz drag on a coil

Which is why I recommended a bending piezo and some vertical freedom for the fulcrum.

Quotea friction free fulcrum is a start.

Which is why I recommended a dry bearing hub.  Ever spin a skate wheel from the old 4 wheel style of roller skate?  For that matter, a pendulum need not have bearings at all, but instead a good pivot point or 'blade'.



TS

Hi TS
would not a dry bearing hub stop any vertical movement?
peter

A circular hub would, of course, have to be included as part of the fulcrum which is allowed movement.  A blade type pivot is even easier and could rest on a covered 'bending piezo' or set of piezos.



TS

Hi TS
I recon that would do it.
peter