Well there you go .
Thanks for the input Hood . I tried the numbers you suggested but unfortunately they were not right for some reason . Probably on inspection at some point it will be the leadscrews I expect . I have not managed to get to them so that I can definitively say what they are . They were measured approximately and I thought that was good enough . Never mind .
The original settings were set to :- x 200,2500.2,500 1,and a 0 . Z was set to 200,1600,175,1 and a 0 .
Now the x steps is 200.133 and the Z is 199.9879 . These were derived by moving the axis 5mm , 10mm and 15mm at a time and reading off the measurement on the DTI . I then multiplied the steps by the amount of intended travel , and then divided the result by the actual distance travelled . This was done quite a few times until I got consistent results . I have a small amount of backlash in the system , but that out was taken prior to the measured move .
The only problem I have with the Z axis drive now is that at 50mm a minute feed , the motor seems to miss an awful lot of steps . Any other feedrate and I get damn good consistency . Any thoughts on this would be gratefully received .
I now need to make a toolplate for my TCL125 so that I can get to mount some tools and get cutting . HOORAH .