cnc6040 damaged, bearing and ballnut questions
Ordered and received an ebay cnc6040 two weeks ago. Y axis table had dings on opposite ends and was 30 mm out of square. After realigning and replacing bent capscrews saw that rear leadscrew ball bearing was damaged but loosening it allowed table to move. Have it running under Mach3 with X and Z running well,but Y axis loses steps and is very rough. Ordered new ball bearings and in taking old ones off noticed that whole gantry assembly can be twisted by hand force. Can twist gantry by .7 mm horizontally, a bit more vertically. Also leadscrew ends can move about 1 mm when held only by ballnut. Is this normal or does it mean the linear bearings and ballnut are cactus?. My background is in electronics, computers and renovation so precision mechanicals are new to me. Is there anyone within 150 km of Ballarat who has a cnc6040 running I could take a look at?. As expected seller has gone silent and given my experience with the router so far (holes not lining up,second hand pump, paint sprayed on bearings and leadscrews) i'm not confident replacement parts would even be identical to the original parts. Thanks. Herman