Morning All & Sundry - Todays job was to assemble the Z axis assembly and check it works OK. I'm now not machining the saddle until I understand what's happening a bit better. The Z axis assembles and runs fine so its either the gantry or the saddle bottom face that is the culprit with the tight gantry bearings. Two weeks ago I surveyed the parts and put them into better and rest piles (better is Scoot and rest is YaG). I've assembled the best parts to establish what's what. One part has an overbent flange and the company will remake that for me. Its counter part is near perfect. One thing I have identified is that my prior machines have been made from 1.5 and 2.0mm sheet metal. This has had a certain amount of give that allowed bearings and fits to average out a little. YaG is made from 3mm and 6mm plate and there is no averaging out... so everything has to be a little bit better then prior builds have been. The saddle to gantry tightness is the only issue I can see so that's not bad... saturdays job is to switch YaGs saddle onto Scoots Z assembly to establish the differences then make correction decisions. Nearly have all the bolts in all the holes and pulled up so we must be getting close to running tests!! Peter