Oh Blimey I bought a CNC Lathe !!!!

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awemawson:
So maybe I can get at the ball screw from the other end? It's under this way cover:

awemawson:
Yes sure enough, removing the suspiciously loose screws that retain it reveals the ball screw and LOADS of brass swarf.

awemawson:
Cleaned it all up a bit, and grasping the ball screw easily managed to bring the V axis assembly back towards the headstock end. After a turn or two there was a satisfying 'clunk' as the overload clutch dropped back into position.

awemawson:
So put it all back together, cleaned up the way cover a bit and tried starting up.

Sure enough V axis overload error is now cleared and I can bring the beast to a 'ready' state, get the hydraulics running and jog X & Z. Jogging V it won't go towards the headstock, and when trying to jog towards the tailstock it carries on going after I take my finger off the button. Emergency Stop button prevented another V axis overload error.

So my next task is to fault find the V axis - it could simply be a sticking 'go right' button, but I don't think so as same button is used for the Z axis jogging.

As those retaining screws were only finger tight I suspect someone has been in here fault finding just prior to me getting the lathe.

awemawson:
It's all happening now! I decided to uprate the main workshop RCD to 100mA trip. Had one in stock so it was an easy choice. (*) Now the C1 main spindle axis is more than happy to turn without tripping the RCD. I suspect that the original 30mA one was perhaps over sensitive - my plunger EDM machine had also taken to tripping it and that is now ok.

V axis still only jogs in one direction. I have my suspicions though. The servo amplifier has an 'absolute positioning system' whereby it keeps it's absolute position in battery backed ram so you don't have to travel over reference points each time you power up.. The value currently held is a stupidly large negative number. I need to find out how (and where) to re-reference it to a sensible value.

But I think we are getting there . . . . . . where ever there is :clap: :clap:

(*) personally I'd be much happier at 30mA which will save a life, whereas 100mA will prevent a fire but still kill you. I'd opted originally for 30mA as on some three phase machines I have a standard UK 13Amp dual switched socket for convenience to power DRO's etc that is sourced from phase one and neutral.

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