From the previous session I think I've given up with the hinged motor mount due to excessive belt bounce etc. While thinking about that may as well balance the lower wheel. This is a laborious procedure which will need to be repeated for the upper wheel.
While thinking about some other motor mount arrangement let's balance the lower wheel.
It's not possible to balance a wheel on it's own bearings, there is just to much race friction. So...we need to mount the wheel temporally on a smaller bearing set with lower rolling resistance. Once again we need another jig.
Here we have a 5/16th threaded rod passing through a couple of mounting blocks that are clamped to the workbench. I'm using roller skate bearings held at the right spacing with nuts so we can just slide the wheel on.
For reference I marked 4 points (1,2,3 & 4) at 90 degrees. Initially the wheel will always 'drop' to the heavy spot at 6 o'clock so I tape a washer or nut at 12 o'clock and see which way she turns.
It's a painful trial & error procedure which takes about 1/2 hour, relocating or adding/removing washers and nuts. Here the wheel is balanced with a large flange nut and two washers - both screwed down. See next video clip post.
View from the back.
See the related post:
https://alanm52.wordpress.com/2017/12/30/14-bandsaw-wheel-balancing-video/
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