More questions if I may.........

Made the 2 delrin nuts no probs, mounted one each side of the connector block (what was the original nut that I trashed).

The problem I have is that although the backlash is almost gone the resultant friction caused is making the screw difficult to turn. Theres still a bit of alignment to do which will hopfully reduce it a bit and Ive also got the gibbs set to tight. However I noticed that the last bit of backlash/play is actually the delrin flexing. Is this correct or have I made a mistake some where?

Once the alignment and gibbs are set correctly there should be no play under no load conditions.... But I cant help think that under load this problem will re-appeer and cause problems.

Has anyone else experienced problems between static/no load measurements and actual machining measurements? or am I worring about nothing

I've looked around on the net and some people seem to swear by leadscrews and delrin and some only use ballsrews...
From what I can see the only way to reduce flex in the nut is to use a metal one with delrin as the antibacklash, but surley this will only "smooth" out the play as ultimately the delrin will have to compress for the metal nut to make contact with the screw during change of direction to increase the strength......

Hope this makes sense. pretty much finished the x axis motor mounts so changing to ballscrews will be a major redesign.

I cant make up my mind If an accurrate small small mill (ie ball screws) will still be usefull after its built the bigger machine....