Quote Originally Posted by Desertboy View Post
I had a sticky bit right at the end of my travel on one of my Y ballscrews kept firing a stall detect at me, after 10 to 15 running up and down the lengths occasionally stalling the problem disapeared. The area where it stalled is now part of my homing sequence so it gets travelled over regulary never stalled again.
That's most likely to be alignment issue not sticky seals. To be honest I've fitted 100's ballscrews and never had sticky seal on the ballnut(presume you mean ballnut seal)

Now what can happen is often the spacers on the BK bearings are not long enough and the seal in BK bearing can rub on the screw.
This tends to happen mostly on cheap BK bearings. Also on cheap BK bearings, like what Chai Sells, the bearings are not always shimmed correctly or even in wrong way round so when tightening the nut they will bind.

Joe If BK's came from Fred at BST then you can tighten them fully and they won't bind. Fred BK bearings are light years better than Chai's.