My jigsaw started sparking and throwing out smoke, so I took it to bits, found a shorted coil in the motor, and disconnected it. But it's still doing this (sew video). Is there anything that can be done, or does it go in the bucket?
You need to repair the coil not remove it.
Removing it makes the motor provide force 23/24ths of the time. How is that wrong? And why would it still flash at the brushes when the shorted one is removed?
Yawn. Replace the brushes. Yawn.
Or throw it.
Tried that before on a brush cutter, but it didn't fix the problem. I was told the coils were shorting and that was busting the brushes. I got a warranty replacement.
In this case, the jigsaw DID have a shorted coil. Every coil was 1.15 ohms except one coil which was 0.1 ohms.
Yes but 1 time in 24 the current is going from full to min and causing the sparks.
I see. But presumably nothing like from full to short.
Repairing the coil would be impossible, the insulation is like glue, you can't unravel little motors like that.
Hmmm, seems like your 21 year old degree is as useless as you are. You have been called a tool twice. Allow me to call you a prick.
In message , Mr Pounder Esquire writes
None of my business but anything that looks like a shorted turn does annoying things with an alternating magnetic field:-(
I am sure that many kettles have an opinion on that.
Kettles do not post here, thicko.
Bosch spares are usually readily available, and not too expensive.
It's a "Challenge" from Argos. Not a big brand.
Consider the armature approximating a rotating transformer.
One segment that has a short is like shorting a winding in a transformer.
Either get a new armature, or get a new jigsaw. I would favour the latter.
There's always the horrible bodge option. Run the thing in series with a 3k W fire. If it still sparks too much, reduce the fire power. Of course it'll affect the motor speed & power some, but not greatly. And you'll probably find that 1 time in 24 it won't self start until moved slightly.
NT
If its a decent jigsaw, then replace the armature. If not, bin it.
Needs rewinding, probably not worth doing just get another one. The reason why it happened in the first place might be nice to know for future proofing the new one!
Brian
Looks like a Bosch to me.
+1
No, unless Bosch are in the habit of selling off QC failed items to Argos?
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