Need Help!- Bridgeport Gross positioning error

[Ogre4x4]

Gday

I got a Interact 308.

When i start the machine and start the Z reference the X is slowly moving also. Then i get the Gross positioning error.

Is the Clamps for the X stuffed???

What can i do???

Thanks

Luke

[machintek]

If a axis drifts it means that the positioning system is compromised. Typically encoder or cable. Swap x and Y motors and see if the problem follows the motor.
Also there were different versions of controls on the 308. The later ones had siemens drives.

George

[Ogre4x4]

Hey

Thanks. I have begun to swap motors.
Before i start pulling them out i found i was able to turn the X motor by hand but the y wont move.
Is the motor the only thing that keeps it still when not in use or are there clamps when stationary?
Does this narrow it down at all.
Im guessing that by swaping motors i can see if the wires are stuffed or the motor?

Thanks

Luke

[machintek]

Z has a brake. Y does not and should move (and home 2nd). X should not drift but home when the Y is finished. Sounds as if you have multiple issues.

George

[machintek]

Z has a brake. Y does not and should move (and home 2nd). X should not drift but home when the Y is finished. Sounds as if you have multiple issues.

George

[Ogre4x4]

Well i swapped motors anyway... it seems to have fixed something... dont know why.
I can no longer move x by hand...
We will see how long it lasts with the motors swapped.

[awemawson]

Which would imply that you had a bad connection somewhere that you have moved as the motors were exchanged. I'd do a 'wriggle & tap' test 'in the manner of a reasonable man' on your various leads, plugs etc

[gus]

'in the manner of a reasonable man'

[awemawson]

Originally Posted by gus 'in the manner of a reasonable man'

This phrase was written into the backplane testing specification for Ferranti Argus 500 process control computers back in the 70's, where we were called upon to tap on the multi-layer plus wire wrapped backplane with a screwdriver handle 'in the manner of a reasonable man'. It did on occassions show up intermittant faults. Ferranti in those days was a company run by gentlemen, and such style of phrasing was not uncommon! I was with them for the best part of thirty years in one role or another.