I'm about to mount scales on my Bridgeport clone. I've been contemplating various mounting approaches that will let me get the scales perfectly aligned so there is no binding as the table/saddle/knee moves.
However, I came across this:
It seems like a good approach. If you can get miniature ball joints with no slop, then this rig would not require that the scale be perfectly aligned. Close would be good enough because the ball joint linkage would prevent destructive forces from being realized at the scale head.
I've found suitable ball joint components at McMaster for <$8, and some very cheap ones on ebay that are quite small (4-40 thread).
Assuming there is no slop, can you see any problems with this approach?