On Saturday 13 July 2013 21:15:37 Terry Christophersen did opine: > Hi, > I have a SEM servo motor that has a bad bearing(pulley side). I > usually send in all motor problems to a motor repair shop and $500.00 > later Im back in business. This is a spare so Im not going to have any > machine down time but I cant see paying 500 for a 10.00 dollar bearing. > Someone told me that when you dissassemble/assemble you cant let the arm > touch the magnets.Is that true? If that is true then motor shops must > have some kind of fixture. Anybody have replaced a bearing themselves? > > Thanks > > Terry Christophersen
My guess is that you must remove the end bell and the bad bearing without taking the armature out of the field. If when you take out the bolts, and pull the end bell by pushing on the motor shaft, the bearing will either stay in the end bell, or on the shaft. From there it should be obvious how to replace the bearing as long as the armature is not withdrawn from the field. Once the end bell and fresh bearing are put back together, don't forget to exercise it liberally with a dead blow hammer in order to properly reseat the bearing. I don't know, and cannot imagine why the armature can't be allowed to touch the magnets as long as its not spun when its touching, which could cut through the varnish on the laminations, possibly creating inter-laminate shorts which would then cause more localized heat from eddy currant losses in the motor. Perhaps one could find some thin, fairly hard plastic that could be cut into strips and inserted from the far end bell, if it has vent holes, (rare in my experience) which would then serve as cushions to prevent the contact. I'd have to play it by ear on that. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> Hitchcock's Staple Principle: The stapler runs out of staples only while you are trying to staple something. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. Start your free trial of AppDynamics Pro today! http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
