![]() Going to get some new brushes today, then jumper the motor to see if everything is OK. You can also turn the motor with a firm grip at the working end too. You can turn the motor at the commutator with your finger easily. I will use some fine emery to clean it up a little anyway. The washers drop off onto the table when you are not looking and then you say what the hell. *** If you pull the armature note any thrust washers at shaft ends and the orientation of spring washers. Whatever the base line reading you get all the measured readings, bar to bar should be within 1/4 ohm of your base line.īeing that measuring low resistance is difficult I say a rough test. The resistance should be in the low range usually 10 ohms or lower. also the arc growling noise comes from the flame burning.īefore you start ordering the expensive parts you need to start the motor and see how bad the arcing maybe.Ī rough test was to take out the armature and measure the resistance between each two bars all the way around the commutator. What happens is the wires that connect to the copper bars get loose (centrifugal force pulls the wires loose) at the connection point there is an increase in resistance (loosing of the connection contact) as the "resistance of the connection increases" the brushes will start from just a small ok arcing to an increasing arc in proportion to how bad the connection is, too a severe hard strong carbon flame burning type arc and from there you will see arc tails that vary in length trying to circle around the commutator. The Commutator is the part of the armature with copper bars that the brushes ride on, if it has somewhat deep carbon arc burns then there maybe an issue. ![]()
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