Re: how to.inspect.motor?
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Thanks for the help. I will have to clear a space to dismantle the lathe for further inspection. That will not be easy!
Ralph
On Tue, Jul 2, 2024 at 12:52?PM Tony Smith via <ajsmith1968= [email protected]> wrote: The holders should be fixed firmly to the end cap, and lined up directly to the one on the other side.? The brush should have just enough clearance to slide in & out, but not wobble about. ? I think the brush might have been damaged from all the crap on the commutator. ? Tony ? ? ? You should remove the motor endcap nearest the brushed, then install the brushes as they were and see what is going on with them.? Things will be a little bit loose, but you should see why the one brush is wearing unevenly.? Try each brush in each hole, and even turn the brushes 180 degrees, (like a drill, not a pizza) and see if they fit better or worse in 1 attitude or the other. Turn the main armature and see if the brushed become dislodged, they should remain perfectly perpendicular as you spin the armature. Continue disassembly and clean all of the carbon dust out of the interior and reassemble with? a drop of oil on the bearings. If the bearings have even the smallest amount ow wear, the motor can fail to run. The shaft can become out of center with the magnetic field and lock up while power is applied and then turn smooth again without power. On 7/1/2024 5:23 PM, Tony Smith wrote: You really need to check if that holder is bent or loose.? That commutator shouldn’t be the that black.? Or any sort of black really, it needs cleaning. ? Doing both isn’t too hard.? You need to pull the end cap off, just take those 4 bolts out.? The cap will be on tight, you might need to tap it off with a hammer.? Once you get that off the armature should come out.? Would help if you take the pulley off.? The bearing in the end cap often hinders things, just slowly work at it. ? Before you do that put some marks on the case so you know how to put it back together. ? Just check the brush holders for anything “odd”.? Loose, cracked, bent, etc.? That brush shouldn’t be angled, and neither should the holder. ? Cleaning the commutator is basically using fine sandpaper(600 grit or better) ?to get back to the copper.? Use a solvent and brush to get as much of the crud off as you can.? Put the armature into the lathe, wrap a strip of sandpaper around the commutator (like you’re not supposed to do) and spin it.? Powering up the lathe would make it easier, but y’know.? If you’ve got a drill stick it in there. ? Go easy, the copper is hardened, but it’s copper.? It won’t take long. ? It’s possible the commutator is worn, but unlikely.? The fix is you just simply turn it down in the lathe, but again. yeah k’know. ? Once? that’s done find something to clean out the slots in the commutator, a hard plastic tool or the like.? Don’t use a knife etc.? There are mica insulators down in the slots, again be gentle and don’t damage those.? You want to get all the carbon & copper dust out. ? Wipe it down with the solvent, put it back together and see how it runs.? ? Tony ? ? ? Here is a video viewing the commutator and brush holder.
Attachments: - Brushes 1.mp4
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