Problem- EZ trak servo motor fried

[ekim]

Can anyone give me some tips on how to replace the y servo on an ez trak.
I need to remove the motor. Send it out to get rebuilt, if it can be. Then reinstall it.

[JoBwan]

Originally Posted by ekim Can anyone give me some tips on how to replace the y servo on an ez trak. I need to remove the motor. Send it out to get rebuilt, if it can be. Then reinstall it.

ekim,
Google Clarkson Company. I have had 6 or 7 motors rebuilt from Steve Clarkson and he is the only certified SEM distributor in the USA. He will diagnose it and quote you with the price, after he receives it. He is currently about 3 weeks out, but for a fee, he will try to expedite it thru for you.
I am near Toledo OH. and the most I have paid is $800.00 for repairs. If it is just a bad encoder, it normally runs @ $380.00. New motors are running @ $1200.00. He does an excellent job, as I have never had a problem once I receive the units back from him. Tell him Joe Baker referred him to you.

[JoBwan]

ekim,
Were you able to get it fixed?

[ekim]

I sent the motor out for repair. Now I have to figure out how to reinstall it. I believe that it needs to be indexed properly. Anybody run in to this out there?

[JoBwan]

Originally Posted by ekim I sent the motor out for repair. Now I have to figure out how to reinstall it. I believe that it needs to be indexed properly. Anybody run in to this out there?

Just re-install the motor. Make sure the belt is in a straight line to each pulley. There is a limit switch on the machine that will tell the motor when to home out. The encoder on the motor will automatically find the machine "zero" point and it should be good to go. I have been fortunate on this with 8 - 10 machines in our shop. Hope this helps.

[NC Cams]

It isn't quite that "Automatic".

The machine looks for the once per rev timing pulse and, it if is too far from the limit swith, the tinkg will stall out and error. You may have to move the belt a cog or so, maybe more. THis is not something you can blindly remove and it "fixes itself" when you reinstall it.

Clarkson is the best for SEM motors.

[JoBwan]

Originally Posted by NC Cams It isn't quite that "Automatic". The machine looks for the once per rev timing pulse and, it if is too far from the limit swith, the tinkg will stall out and error. You may have to move the belt a cog or so, maybe more. THis is not something you can blindly remove and it "fixes itself" when you reinstall it. Clarkson is the best for SEM motors.

NC,
Are you actually telling me how lucky Ive been? I do appreciate the info and I will need to be a little more cautious in the future. I am as close to blinded as it comes on some repairs, and I never thought of it to be an issue.
Thanks, You may have ended my lucky streak?? LOL!

[One of Many]

The most you will be out is 1 turn of the motor/encoder if the encoder has only one marker pulse. Belt driven screw ratios will reduce the actual table/screw motion to something less than the screw pitch distance. In this case .200 for one screw revolution may be around 4 turns of a motor revolution or .05 off the original setup. Over travel (if the machine has these limit switches) conditions are usually within .05 or less past the homing switch. Hard stops at least one screw pitch or better past the over travel switches.

NC makes a fair point. While it may not always be cut and dry. Luck is usually on your side, provided someone else hasn't already altered and compromised the original safety buffers that prevent hitting hard end of travels for machines that do not have over travel limits.

DC

[Al_The_Man]

Often the biggest implication is seen on Z axis that has a tool changer, the Z is usually positioned at Home zero or something relative in order to tool change, Industrial controllers have what is called a Grid Shift in order to adjust the home marker pulse electronically, this avoids the necessity of trying to fudge the Z axis encoder to the right position.
In the case of lathe's, they are sometimes set to plug in the distance value from the centre line for X and the face of the chuck for Z, in this case, these 'Home' values can be adjusted.
Al.