Author Topic: WTB :) Good used comm lathe!  (Read 1986 times)

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Offline RYY

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WTB :) Good used comm lathe!
« on: September 06, 2005, 05:36:44 PM »
Hello all,
I am tired of borrowing (and I am sure he is tired of lending) Craig's comm. lathe.  I am looking to purchase a good used one, does any one know of one or one they would recommend?
RYY
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Offline Grinder

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WTB :) Good used comm lathe!
« Reply #1 on: September 06, 2005, 07:05:23 PM »
Yea ditto ('cept I'm not borowing Craigs - so someone sell Ryan one so I can borrow Craig's).

Sounds like cutting the comm is more common if you are running 12th scale and I seem to be doing it a lot more in 10th scale.  Definately getting more pep out of the motor that way...
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Offline Tom

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WTB :) Good used comm lathe!
« Reply #2 on: September 06, 2005, 07:24:59 PM »
Cutting the commutator is a method to extend the useful life of your motor, at the same time increasing the performance.  It's a win-win situation.

The primary cause of wear of the commutator is due to arcing, which erodes the commutator.  As the commuator wears, it arcs more, which causes it to wear even faster.  Plus, as a commutator wears more, the contact area of the commutator changes, which decreases the time each pole is energized, which lessens the power output of the motor.

Touring cars will be harder on commutators than 1/12 scale cars, due largely to the fact that 1/12 scale cars use 4 cells, as opposed to the 6 cells used in the outdoor cars.  So, commutator wear is a much larger issue with Touring cars than it is with 1/12 scale cars.

Part of that is offset by the current 1/12 scale club motor; the MVP tends to wear out the commutator much faster than other styles of motors.

People may very well cut the comms on their 1/12 scale motors more than their 1/10 scale motors, but that is due mostly to factors other than the respective wear rates of the commutators, since 1/12 scale motors tend to last so much longer than ones used in 1/10 scale cars.

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WTB :) Good used comm lathe!
« Reply #3 on: September 06, 2005, 07:29:04 PM »
well im no expert but i  seem to cut my com alot more in touring cars ,12 scale mabye every 2 weeks but  i wait till the brushes wear and that usually takes about  3 sat nites........in a touring car every week sometimes more often