From: terrell.michael.a@gmail.com   
      
   On Monday, May 18, 2020 at 6:43:19 PM UTC-4, default wrote:   
   >   
   > On Mon, 18 May 2020 05:02:35 -0700 (PDT), Michael Terrell wrote:   
   > >   
   > >Metal polish (EG: Brasso), or a large in eraser is better than sandpaper.   
   It leaves a highly polished surface that only removes the oxides.   
   > >   
   > >Small generators are intended for lighting, or power tools where you only   
   have to be close. Also, without a load the output isn't a clean sine wave. Any   
   inductive load helps to clean up their output.   
   >    
   > Those old-school ink erasers were the best IMO.  Don't see them   
   > anymore...   
   >    
   > Fine abrasives have the advantage of cleaning off the brush surfaces   
   > and reseating brushes, so it may be more advantageous in a generator   
   > that has been in storage for awhile. Otherwise I concur, a pencil   
   > eraser is a good choice.   
      
      
      I used to rebuild vacuum clean motors as a sideline. The customer kept   
   asking to see my armature lathe, since they commutators all looked brand new.   
   These were made by Lamb, and 120VAC. I would connect them to my 24V DC power   
   supply and polish the    
   commutator with the motor running at a reduced speed. He gave me all his bad   
   motors. I sold them back to him at half the wholesale price, with over a 50%   
   recover rate. Many didn't run because the commutator was so nasty. I reground   
   a blade for my Exacto    
   knife to undercut the mica spacers. A lot of the time it only took five   
   minutes to revive a motor. He never did figure it out, but he never brought   
   back any of my repaired motors. Other had bad bearings or burnt windings so   
   they were stripped and the    
   good parts were used to make a good fan. I ended up with scrap aluminum and   
   copper from the scrap parts, as well. :)   
      
      Ink erasers are still available, but you might have to go o an office   
   supply store or buy them online.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)