The Shop > Tools
Warco WM180 problem
awemawson:
That's a REAL quality pot - so how uneven the wire winding is on the track :lol:
BTW 640 x 480 is a very convenient size to post pictures here and saves people who's screen isn't the size of a football stadium scrolling all over the place while still keeping very adequate resolution and saving space on the server.
John Rudd:
Hmmm, Kbic controller...fairly reliable...
So what are the symptoms with the lathe that drew you to the pot being faulty?
Do you have a digital multimeter to fault find with?
GRIFFIN:
Mmmmm, Yes I have a multi meter and the problem started quite a while ago with the lathe tripping the circuit breaker on the mains board but it only happened a handful of times and the problem stopped. Then a week or so ago the trip switch went off a couple of times when I turned the pot. After resetting the circuit breaker for the second time the lathe wouldn't work at all and the pot had fizzed a bit when it tripped out.
I checked everything with the tester and the only fault I could find was on the pot. Current was getting in but no matter where the knob was rotated there was nothing coming out! I then took the back off the pot to find one the tiny plastic lugs had broken off and the central rota had come off (with hindsight it must have been loose and occasionally touching the case causing it to trip out).
As I've mentioned in an earlier post, when I bypass the pot and connect the wires the lathe works but obviously only at one speed! This would indicate that everything else is working and reinforce the theory of the faulty pot.
I've located a couple of wirewound pots in china with the correct specifications and ordered them to try out my theory and I may try to bond the centre rota in place on its plastic carrier and rebuild the old pot as a temporary measure until the new ones arrive from china.
Oh and I take on board about the size of the jpeg, I wrongly assumed that there would be a built in device to limit the size on screen, I will make them smaller in future. I'm still new to the forum and will get better as time goes on. Of course you could left click on the attachment name, this will download the photo so you can view it in your computers photo viewer at the correct size for your own screen.
BTW John, is that a Chipmunk in your avatar?
Cheers, Griff.
GRIFFIN:
Just an update,
I rebuilt the pot with a little hot melt glue replacing the tiny plastic lug & it now functions as it should, according to the multimeter. However, as someone previously forecast, the shorting out that was part of the original problem when the pot fell apart inside, has damaged the PCB or one of the components on the control board. When I re-connected the pot & wiring the lathe works but only at one speed the equivalent of about half the max rpm, regardless of where the pot is rotated to.
Looks like I'm gonna have to bite the bullet and buy a new pot and control board from the dealers! I assume it would be cost prohibitive to have it tested and repaired professionally, unless anyone else knows better?
I will wait till the new pot comes from China first though, just in case the problem is in the old repaired pot.
Cheers, Griff.
John Rudd:
Griff,
I can repair your board if needed, or alternatively supply you with a good tested second user one.
You need to bear in mind that where ever you source a replacement board from that:
1) you need to install the white resistor onto the replacement board( the big white resistor in the right) and
2) you will need to fine tune the board to your motor....the min/max speed accel, IR a d IC adjustments
I can give you a link to the instructions on how to do this or send a copy via email.
I'm goung to be back at Gateshead end of November, I could help sort out if you need any help...
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