You say that you tack welded the coupler to the lead screw? Sounds to me like the lead screw is now warped from the welding process. Even just a little, seemingly harmless tack weld will do this to a degree, the size of which dependent on how hefty the material being welded is. I suggest getting some flexible couplers. No you dont have to spend tons of money on them, re-inforced plastic tubing, with a couple of clamps works fine.
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Stop talking about it and do it already!!!!!
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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