Can you test a armature that might be shorted by using a voltmeter.
Originally posted by Alco Fan - February 12 2011 : 5:21:22 PM
Only if it has Ohm functionality, the ability to test resistance. A straight voltmeter won't do a thing for you, it only tests voltage levels. It can't find a short. If the meter has a setting with an upside down U on it with splayed feet, that's the Ohm function.
Jerry " When life throws you bananas...it's easy to slip up"
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Some times they're bad but work if you bump the loco a bit and that's a pain.
In the slot car days you'd rewind an armature. That would maybe help out the PTs and MU2s.
I think I can check ohms on my meter, thanks.
Originally posted by Alco Fan - February 13 2011 : 10:12:08 AM
I used to race RC cars. When the motor needed a 'bump' to get going there were a few primary causes, none of them being a short on the arm. They were: 1. Comm needed to be cut, groves were worn in it. 2. Brushes were worn out and hanging up. 3. Brush springs were not allowing the brush to properly contact the comm.
To solve #1 the comm needed to be cut on a lath or the armature / motor replaced. To solve #2 the brushes needed to be replaced. To solve #3 the springs needed to be replaced.
Depending on how much runtine and how hard the motor was run all of these may apply at the same time.
A dirty com could also cause issues and this I have seen in some open frame train motors. Using a bright boy I carefully clean the com, oil the bushings and it runs like new.
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Posted - February 12 2011 : 5:21:22 PM
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