Small AC motor has corrosion on the shaft (on both sides of rotor) that is inside the bearings. What is the best way to remove the corrosion (chemical or mechaical) and try to keep the shaft as smooth as possible. i will use a teflon lube when reassembling.
Motor Corrosion
Jan 15, 2015
6 Replies
First, protect the bearings (you might want to replace and/or clean/relube them, but that's another issue). Then, remove any loose material from the corroded area (wire brush, if you can get access without endangering the wiring). Any brown rust can be stabilized (turned to black oxide) with rust converter chemical coatings, but I'd usually just rub on some wax and warm the area with a torch.
Mainly, if there's any condensing moisture around, you want the surface to be non-hydrophilic so moisture doesn't invade a rust pit and enlarge it...
Depending on the value of the motor and your shop equipment, you could turn the shafts of the motor down a bit and put sleeve bushings in to build it back up to the new bearings...you aren't planning on reusing the old bearings, eh? With corrosion on the shaft the balls must be nasty even if it looks sealed...
John :-#)#
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WD-40 or Liquid Wrench in the bearings or bushings?
If you use either of these you much flush ALL the residue out!
WD-40 is for protecting tools from rusting, and the solvents in it evaporate leaving the rest to turn to a protective goo coating. Liquid Wrench is also a fast evaporating solvent with stuff in it to break oxides.
Not what you want left in a bearing I suspect!
John :-#(#
(Please post followups or tech inquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
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Normally, one can will serve a household for a lifetime. However, it suffers from the same problem as your can of WD40, ie you can never find it when you need it - so you need to buy another. As a result, you end up with several cans of various vintages, distributed all over the house and garage.
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Ian
It's sold for use in sewing machines. My mother used it for decades, about a can a year on her commercial sewing machine.
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