Thread: Looking for service for a '84 FP3NC

This is my first time on this site and I was hoping someone here could steer me in the right direction.

Does anyone know if there is anyone that services old Deckel CNCs in the Minneapolis/St. Paul Minnesota area? We have a 1984 FP3NC with a Dialog 4 control. What happens is when you turn the machine on the Y axis jumps like it's going to take off, then it errors the whole machine out. We've been all through the machine and can't pinpoint where the problem is other than to say it appears to be in the Y axis. We've done everything we can think of to fix it ourselves, including swapping scales between X and Y, installing a new Y axis scale, and electrician's been through it with a fine tooth comb, and all we can figure is it's the Y axis.

Welcome to the forum.

Have you cleaned the tachometer (on the end of the servo) ? Best service person for older Deckel CNC's is Don Sentner, known here as Deckel Doctor. He's located in SC but travels all over the country servicing Deckels.

DD's email is sentnermts@netscape.com

(you sure about the year of your machine ? I thought Dialog 4 didn't come out till 1985 or 86 ?)

Agrimson:
Don's suggestion is a good one. Also a bad wire or the wires reversed on the tahco or bad brush will cause a prioblem like you describe as well as a dirty commutator i think. I would try swapping the axis cards in the control. Record the DIP switch settings for the card and its axis. The cards are all the same except for the way the switches are set.
The DeckelDoctor is deffinately the guy for your trouble if these simple suggestions don't help.
Cheers Ross

We sold Dialog upgrade packages.
--
Arno

Yep! My FP4NC is a 1983 machine and has a Dialog4. Was upgraded at some point in its life.
Cheers Ross

I'm aware of the upgrade possiblities but just assumed that was a fairly rare occurance to actually do so. But perhaps not.

Is it only the Y axis that jumps or do all three. If it is all three axis jumping on power up you either have a bad digital to analog chip on the NRP Board in slot VG5 in the operators console or the board itself is bad. I have the D/A chips in stock, this chip usually fixes this problem 90% of the time. If it is only the Y axis it could be that some on has turn the tachometer 180 or installed the wires on the wrong terminals on the tach. The other remote possibility is a broken tach wire going back to the Bosch Servo Drive. Check with a meter the continuity of the wires from the tach to the drive. Look under the bottom of the drive there are terminals that are marked. The y axis terminals are X21 and X22. On X22 pin 1 is on the left pin 7, and 8 are for the tach. Check from tach to these points. Send me a email to sentnermts@netscape.com.

Regards
Deckeldoctor

Thanks for all the responses, we'll look into, it might take a while as it's not a real high priority job. If we can't get it fixed the boss has said we might sell it, we'll see.