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MyData Y wagon shudder



MyData Y wagon shudder | 10 March, 2005

We have a MyData TP-9-2 with a in line Y wagon. It is a long screw and the vintage is 1994. The Y wagon vibrates at about 24 micrometers at about 25 hertz. Burnin reviels zero encoder pulse errors. Hystersis test indicates a Y axis Y wise varance of up to 23 micrometers. When I go to the service utility for motor Y and read positions several times the varance is again about 23 micrometers of position error. If I push with about 2 lbs of force and release pressure the vibration stops. I have swapped the MOT driver card with another axis but problem persists. What should I be looking for? Is this an indication of a impending motor failure. Can the ribbon cable be the cause, it is about 5 years old. Are there any way of adjusting transducers. Can a faulty or noise from power supply be working here. Thanks for any response.

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MyData Y wagon shudder | 11 March, 2005

If you are not getting repeatable transducer readings then some possiblities are :

1. Transducer is bad 2. Motor is bad 3. Y power booster

Also, I can't remember if the Y motor has a flex coupling on it or not. If it does, check that out.

Also, when was the last time the Y screw was greased ?

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MyData Y wagon shudder | 16 March, 2005

We grease acording to PM schedule. The cable is very old about 5 years. We run 2 shifts. The transducer program and burnin test show the varance that we are seeing phisically so I can rule out the transducer. The motor may be the cause as it is of 1994 vintage. Bearing may also be the cause. Before I took over maintenance the machines recieved very speratic PM. With the big RED palmed down pushing on Y wagon you can feel a roughness in the lead screw nut bearing. But somehow I get the feeling the problem is electrical.

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MyData Y wagon shudder | 23 March, 2005

Problem solved. Thru the help of MyData support we have determined that older MyDatas have a software issue with the servo drivers. A newer rev of driver will fix this problem.

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