I disconnected the link to the x dive so that I could slide the z assembly across.
Yuck!!! It is grinding and not right at all.
Suspicious of the top rail, I gently slid the rail out so the the z assembly was just on the bottom rail - still binding.
Put the top rail back in and remove the bottom rail..... Smooth as silk!!!
I removed the z assembly and could see that one of the bearing blocks was just slightly off centre - maybe 0.5mm too low. nothing wrong with the block, i had drilled the holes in the wood in the wrong place. Ok time to be bold!
I removed the offending bearing block and the thing is wobble free with two bearing blocks at the top and one at the bottom.
Reassemble (including strengthening the attachment to the drive on the x axis) and... Oh my... It trundles smoothly back and forwards.
Quick grab a router!
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