Gallery, Projects and General > Project Logs
Quornish
shipto:
230V dc 150W motor out of a clark mini lathe. The origional controller went pop a long time ago and at that time I couldn't afford to replace it.
awemawson:
Pop it in the airing cupboard for a few days to dry it out. If that doesn’t work passing dc through the windings of a few tens of watts to warm it from within usually works a charm v
shipto:
I dont think its anything to do with moisture Andrew.
I looked at it after work and I think I have figured it out. First of all I stripped it apart and checked for shorts and found non but changed the bearings while it was apart. After that I ran it back up with the meter attached and noticed the voltage builds up over time rather than just being there from switch on, so my conclusion is that it is building up static. This will of course be solved by earthing the machine.
vtsteam:
Static buildup. Never heard of that! But there's huge amount I haven't heard of. Mostly everything, actually.
Maybe that would explain the death of the controller in past lathe days.
shipto:
There are a few articles on the subject and I had never thought about it before but some of the fans we build at work have earthing bosses welded to the frame for certain environments these tend to have some black plastic lines welded to the plastic impellers too because the black plastic contains carbon which forms a conductor to take the static away. I believe its part of the ATEX requirements.
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