I'm thinking that your problem may not be related to thermal comp. It could be, however you say that sizes go up and down all day?
Turn off the thermal comp and see if it makes a difference.
If it makes it better, then you will probably find that your x axis temperature sensor is faulty and that would be why your sizes are all over the place.
If turning off the thermal comp makes no difference then you could find that the locknut on the bottom of the x axis balllscrew could be loose and allowing unwanted movement sometimes. To check this, remove lower x axis cover. look at lower support bearing end of ballscrew. you will see a locknut with a lock screw. move the axis slowley until you can access the lock screw. undo the lock screw. Now see if you can turn the lock nut. if you can't then it is tight enough - lock up the lock screw again and refit cover. If it is loose then tighten it up - be very careful not to overtighten though - and remember to retighten the locking screw.
Hope this helps  |