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micro mill electricals problems, help please!!

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pmdevlin:
Hi all, I will set the scene! I'm pretty new at model engineering, and need some desperate help. I don't even know if I am posting the correct place, mods please move if applicable.

I was today using my micro mill, low rpm, milling some plastic sheet, so no problems here. I bought this off a friend, a very talented engineer, and a regular on this forum, he passed away last year, so my predicament is that I cannot go back to him to talk about the mill he knew inside out. It had been modified to suit his disabilities, it is belt drive, and the control panel was moved away from the machine so he could reach it. I believe its a seig machine, they are the instructions he gave me with it, although it has no markings on it. All I can say is he only used good stuff!

So after a bit of use, the fuse in the control panel blew, I changed it, it blew again. I have inspected the motor, taken it apart, all is good, no binding, brushes good, no signs of excessive heat,. all windings seem to be ok. The connecting block between the control panel and machine is good. Reassembled, fuse blew again.

So, with control panel disconnected from the motor, I can turn on, and turn up potentiometer, nothing is amiss. When connected to the motor, the motor immediately spins up with the potentiometer in the off position, and the fuse blows. I assume with potentiometer in off position, motor should not spin up?

I have inspected inside the control unit, all appears to be fine, and no smell of electrical death! I am now at a complete loss as I have absolutely no knowledge of how the control panel works, what to test, how to test, and what to do now please help! I am thinking the control panel is faulty, as its been modified the manufacturer will be no help, can anybody suggest a repairer or is the mill now finished!, 
Many thanks

Paul

lordedmond:
I am assuming you are in the UK

Get a 100watt lamp old fashioned type a lamp holder and wire these up instead of the motor ,leave the motor disconnected , now if the fuse blows  it's the controller if not it's likely the motor

Note you can get the bits from arcurtrade or amadeal but if the motor is duff and you put a new controller in it most like will go kaput

It may be simpler if you are not sure to replace both at the same time

Stuart

Edited to include more info as requested below

Pete W.:

--- Quote from: Stuart on December 17, 2014, 12:09:44 PM ---
SNIP

Note you can get the bits from arc ... SNIP

Stuart

--- End quote ---

Hi there, Stuart,

You know what you mean by 'arc' and I think I know what you mean but does Paul?  I suggest you elaborate.

Hi there, Paul,

Your photos are reader-unfriendly - much too large.  I suggest you go to the 'Gallery' section and read about re-sizing photos. 

velocette:
hi Paul
Check your PM  and posting on HMEM  Eric

pmdevlin:
will do Eric, yeah just clicked on the photos and they are massive, sorry. I am familiar with arc euro trade thanks for the pointer, I cant replace both components, way too expensive, too expensive even for one of them, hence needing a "fix"

I will do lamp test, and suggested motor test by pm,  and report back
Thanks

Paul

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