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Sieg Micro mill problem.

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DavidA:
Hi all,

Haven't been around much recently, but as the winter is approaching it is time to go in the shed, turn up the heat and make progress with the Fowler 4f loco.

So, I was machining a small block of aluminium on the Sieg. Switched it off, but it wouldn't re start.

It has been doing this on a number of occasions. It is running ok. Turn off the motor with the speed control, and when I try to start it again, nothing happens.

The green light is on.

I have checked the brushes, ok.

Looked inside the electronics box. no sign of any loose connections or burning etc.

I have had the machine for about five years, but it is very low mileage. Probably hasn't run for more than twenty/twenty five hours total. All very light work.

(I did notice that the motor pinion is an absolutely abysmal fit on the shaft. I'll have to do something about that)

Does anyone know what may be causing this problem ?  Is it a 'stock' fault with these machines ?

Hope someone can help here.

Dave.

Barabas:
I'd guess the switch on the speed control is duff.  That's what happened to mine - sometimes a light tap with a small hammer on the knob would make it work for a while.  A new pot from arceuro fixed it - not too difficult if you're handy with a soldering iron...

DavidA:
Thanks for that.

I'll try pulling out the pot and maybe I can effect a temporary fix. If that works then I can get a new one.

Dave.

RodW:
Try removing all connectors, spray with Inox and wipe clean then reassemble. Worked a treat on my Seig SX3

John Rudd:
Before you dive in pulling things apart and condemning parts, try this first!

Disconnect the motor wires where they connect either to the main pcb or the fwd/rev switch. Now take a domestic light bulb in a holder with a pair of wires attached...Connect in place of the motor.
Now set the mill going as you would, the bulb should glow from dim to full brightness as the speed pot is operated.If it does then suspect the motor, if it doesnt behave like this then the fault is with the electronics...
Report back your findings and we will take it from there....

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