Harrison M300 cnc

[keith wainwright]

Hello .I finally got servo motors and all that's required working on my Harrison m 300 . but small problem . The lathe runs great forward and reverse (m3 m4)and stops fine (m5) it displays correct revs and feed per rev ok. Both long traverse and cross slide work fine on the buttons .Problem is if I type Go z200 it only goes to about 48 and stops . It reads 48 ish but wont go to 200 or any size bigger than 100 There's nothing in the way and makes no difference where the zero is. I can jog past no problem . Also it does this in the middle of a program and loses its way it then very quickly runs through the program to the m30 command and all it does is giggle the tool a little . Servo motors work good and are very accurate over small distances . ANY BODY any ideas its driving me mad . Its all running and I want to put the covers on and tidy it up . It runs through a force 9 Ethernet smoothstepper . The computer boots up and installs the plugin no probs. Thanks Forgot to mention when it loses its way or stops in wrong place E stop wont work nor will limit switches . I have to have my finger on the power switch.