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Old 01-12-2006, 11:24 AM   #1
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how often do i need to cut my comm i heard after 2 battery packs the reason im asking is that after i had a race day i had to take a big chunk off my com to get it looking good . AND BEFORE EVERYONE BLASTS ME ABOUT DOING A SEARCH YES I DID AND NO I CANT FIND ANYTHING REGARDING WHAT I NEED TO KNOW THANKS GUYS
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Old 01-12-2006, 12:05 PM   #2
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you can cut the comm every run it all depends on the brush that you are running and how bad the old brushes look.

i skim the comm very lightly inbetween runs using the same brush and breaking it in on a 3V battery b4 i actually go out and start hacking.

But i say 5 runs on avg before you need to do any cutting.
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Old 01-12-2006, 12:12 PM   #3
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Old 01-12-2006, 02:15 PM   #4
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i cut my comm about every 25 runs...thats when i have noticed a small lack of power out of my car (.2-.3 tenths a lap average) that is when i used Putnam green/blue combo on the Monster stock motors

when i ran "F" brushes and had to recutand put new brushes on more often...about every 6 runs till i seen a loss in performance

every brush is different as to when it seems to lose its edge, and many drivers will have different opinions on when its time to rebuild a motor...i dont feel its necessary to di it as often as alot of people do it for CLUB racing...at a national level a little more often might be necessary
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Old 01-12-2006, 02:35 PM   #5
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practice 3-5 runs before a cut...

racing cut the comm every run...

brushes, run them down till they go bad... depending on the brush and whether or not they discolor from overheating...

this is what i do... cutting the comm often is not only good for performance, but lengthens the life of the motor.
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Old 01-12-2006, 02:42 PM   #6
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It depends on the teardown of the motor too. A 8x1 Ti is going to wear differently to a 8x1 CP. My Ti's are 1 run and cut motors. With a CP, this is not the case. Then it will come down to how you tune and gear the motor.

If you have the equipment, then do it as often as possible.
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Old 01-12-2006, 02:48 PM   #7
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thanks a mill guys for all the info so i will cut every 2 to 3 runs that should be ok
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