Hi, I just recently picked up a 1988 CnC Ostmach Mill KR-V3000 (looks like King Rich KR-V3000 castings) with a Dynapath Delta 20 control. I've been working on getting it cleaned up and tuned. I've set the CNC control up to run off single phase and hooked the spindle up with a vfd, but have yet to make any chips with it. It's my first machining tool bigger than a drill press, so while I've been reading up on it for awhile, I don't have a lot of hands on experience.
Anyway, to the problem, I've been trying to get the axis lag under control for a few days now, It's got a Geetek drive on the X, currently reading 0.0012", and Servo Dynamics drives on the Y and Z (axis lag of .0062 and .0031 respectively), which is significantly higher than the numbers of +/-0.0002" I've been reading that it should be.
So far I've,
1. Attempted to tune the balance pots, the X axis went down from about .003 to the current .0012 but I was unable to take it further, I was only able to see a change of about .0006 either way with the pot on the Y axis, and Z was no better.
2. Checked the Y and Z axis for mechanical problems, they seem fine, both can be turned by hand with no great effort.
3. We hooked up a scope to the tp6 test point and tuned the Y drive as it says in a Servo Dynamics manual I found, tuned various pots to bring it into a fairly linear deceleration curve, and reduced the oscillations after deceleration. This didn't appear to have any effect on the axis lag however, I did notice the tach line seemed rather noisy, but I'm not certain it's not just electrical noise being picked up from elsewhere by the scope.
Any help would be greatly appreciated, I'd really like to be able to get these drives going if it's possible.
Edit: One other thing I forgot to add, is that it has a tendancy to move the bed around a bit as the control is booting up, which then stops once the control has started, I'm not sure if that is normal or not.
Anyway, to the problem, I've been trying to get the axis lag under control for a few days now, It's got a Geetek drive on the X, currently reading 0.0012", and Servo Dynamics drives on the Y and Z (axis lag of .0062 and .0031 respectively), which is significantly higher than the numbers of +/-0.0002" I've been reading that it should be.
So far I've,
1. Attempted to tune the balance pots, the X axis went down from about .003 to the current .0012 but I was unable to take it further, I was only able to see a change of about .0006 either way with the pot on the Y axis, and Z was no better.
2. Checked the Y and Z axis for mechanical problems, they seem fine, both can be turned by hand with no great effort.
3. We hooked up a scope to the tp6 test point and tuned the Y drive as it says in a Servo Dynamics manual I found, tuned various pots to bring it into a fairly linear deceleration curve, and reduced the oscillations after deceleration. This didn't appear to have any effect on the axis lag however, I did notice the tach line seemed rather noisy, but I'm not certain it's not just electrical noise being picked up from elsewhere by the scope.
Any help would be greatly appreciated, I'd really like to be able to get these drives going if it's possible.
Edit: One other thing I forgot to add, is that it has a tendancy to move the bed around a bit as the control is booting up, which then stops once the control has started, I'm not sure if that is normal or not.