I have been trying to make chess pieces with the schools NC-65 lathe. The first 4 or 5 where great the they started coming out at different sizes, upon inspection i discovered the x axis was skipping then found a broken sensor on the machine. I replaced and broke that sensor (boilermaker by trade), so i got a fitter to help replace that sensor and we reassembled machine. This has taken place over 4 years. I still have the problem that the bloody thing is still moving erratically on the x axis. I have attached a video (zipped up) file any help will be really appreciated.