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micro mill electricals problems, help please!!

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lordedmond:
Paul

To keep all your fingers  :D get a 3 volt battery and a 3 volt lamp

Connect up battery lamp motor and back to the battery all in a long chain turn the motor by hand very slowly ( it will be better one way) and watch the lamp it may flicker but as you have thought out any dead segegments are bad news

The reason for three volts is there is no possiblity of the motor turning , thus safe

Now this is not the way I would do it I would do a volt drop test on the armature but that requires more equipment , or a growler test , that uses a coil with lamination fed with AC and held on the armature laminations a old hack saw blade held on the other side will rattle if a short is present
As a last comment if it looks ok and smell ok it should be OK if he did not leave it on AC for long , it would have made a loud hum and not rotated , henc his misinformed diagnosis due to fault testing methods

Hope you get it sorted with a little impact to the wallet

Note I refer to lamps it's because they go in lamp holders and bulbs go in the garden , remember the clout round the ear hole in 1962 when I started work at the tender age of 15

Stuart

pmdevlin:
collected the control panel today, and its on the way to Hull! :headbang:

Having proved its a dc motor (sticker on it!!) expert has kept it to test on high dc voltage, if faulty he has agreed to replace. He confirmed he used the large micro mill spec sticker thinking it was referring to the motor.

Hopefully all will work out ok!

John Rudd:
Yup,I'll let you know when it gets here and what the problem is.... :zap:

steampunkpete:
Keep us all informed John, we are all on the edge of our seats.

If its an MXT-2325 board like mine, I'll have spare diodes and thyristors.

Pete

pmdevlin:
motor is back with me now. The guy wanted it tested on a higher dc voltage if he was to replace as promised. A fair request I suppose, however, no test can replicate the voltage and load this motor is designed to take. It was tested on 60v dc, with variable supply, he borrowed something to do it, I watched! It ran from a virtual stall speed, up to what the 60v could deliver in terms of speed. Even at low speeds, it was impossible to hold the shaft by hand, so the torque was certainly there. No heat, no smoke, it ran for some time, so I had no option but to agree he got off the hook :D

If John has some luck with the controller, it will be a nervous time turning it all on again, I hope the motor is actually ok, he says it ran only for seconds on ac so I think we should be ok. I have stripped it again, no signs of damage, heat or any smell of electrical death!

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