Wanted: DC servo/tach for Y axis on Tree Journeyman 300

MT6 said:

I have a Tree Journeyman 300 that I got working. It was running good but the Y axis would flake out occasionally. I damaged the tachometer windings thru my carelessness. I've piggy back other tachs to the motor but they don't have the resolution I need (to much hunting). I'm hoping someone may be parting out or have spare parts for this early 80's vintage machine. It was well maintained but hadn't run for at least 6 years. Still has a paper tape reader but was upgraded to a RS232 which is working for transferring programs.

The shaft that the tach armature mounts on is .255" and the outside diameter of the tach housing is ~1.92". The business end of the permanent magnet servo is .625". There's two wires to the servo and 2 wires to the tach.

Hopefully someone will know of a source for a spare tach or complete motor assy.

Thanks,
MT6

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MT6 said:

Monarchist, thanks for the info. I believe it is a Tachogenerator. It generates a DC voltage when turned. The one on this motor mounts directly on the motor shaft. Unfortunately the label on the servo is unreadable. The tach that I mounted on the motor is 20V/1000rpm. I don't know what the original one is but it may be around 7V/1000. I put in a potentiometer to tweek the voltage down but I don't think the tach has fine enough resolution.

Servo-Tek may have an appropriate tach that I can piggy back on. Was just hoping to not have to kluge it to much.

Can you provide a link to the Ebay rebuilder? I can't come up with the appropriate search words to find them.

Thanks,
MT6

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