From the previous post removed the lower wheel to check again for run-out, wobble and balance etc.  Went through each one again, trimmed the rim a bit for run-out, cleaned up the crown and rebalanced the wheel again. Hmm nothing here to cause that amount of shaking. Put the wheel back on, hooked up the drive belt and turned on the motor – still shaking !!!

Then the penny dropped, it’s the TV stand !!! Went inside and got that low table (previously mentioned) that I used for the first bandsaw.

The TV stand was a bad choice, four unbraced ‘legs’ and to make thing worse I put it on castors!