Lucien Nunes

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Damp here this morning, and the insulation resistance on a piece of workshop equipment seemed a bit low. I could influence the reading by pressing my hands against the outside of one of its controls. That, and the fact it is getting a bit stiff to operate, show that it's time for this control to be stripped down and cleaned. Metal deposits and dirt build up inside over the years and cause leakage.

The main core of the thing consists of 36 parts threaded onto a shaft. I slide them onto a long screwdriver to preserve their order and orientation as I take them off. Then as I clean each one I put it back onto the shaft.

What equipment is it part of? The maker's name will be familiar but the equipment itself probably not so much. A couple of people here will get it in one. Give the others a chance.
 

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When you said about the items on the shaft I was thinking some sort of cam operated programmer. But the photo doesn't show one.
 
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Definite similarities though. That pic shows some of the conductive build-up on a moving part. It rotates around this part:
 

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Nine sliprings, if you want to call them that.
 

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So transferring power to a rotating part. Nine rings to cope with the amount of current needed to be transferred?
 
Nine because there are nine separately movable subassemblies. Hub, fixed contact (slipring), rotor and moving contact.
 

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Measuring instrument. Hurry up, I'm on section 8 of 9
 
Also lots of similarities.
Section 9's wheel and moving contact cleaned
 

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Inserting the contact rods.
 

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Thread starter

Lucien Nunes

Broke Internet
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London for the time being
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http://www.electrokinetica.org
If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
United Kingdom
What type of forum member are you?
Electrical Engineer (Qualified)

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Title
Low insulation puzzle: what's this?
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UK Electrical Forum
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