BRUSHES

Old 05-17-2007, 06:25 AM
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Does any one cut there brushes on the trailing and leading edges. Do you get better performance when doing this, also which way do you cut them.( for example positive side cut on trailing or leading edge)?
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Old 05-17-2007, 07:48 AM
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Originally Posted by 16skyline
Does any one cut there brushes on the trailing and leading edges. Do you get better performance when doing this, also which way do you cut them.( for example positive side cut on trailing or leading edge)?
you ll get better answer asking on the here Eric Anderson here http://www.rctech.net/forum/showthread.php?t=44983 or EddieO here http://www.rctech.net/forum/showthread.php?t=51001
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Old 05-17-2007, 10:30 AM
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Originally Posted by 16skyline
Does any one cut there brushes on the trailing and leading edges. Do you get better performance when doing this, also which way do you cut them.( for example positive side cut on trailing or leading edge)?
If you remove material from the trailing edge of each brush, (similar to a "timed" cut) torque and rpm increases, which increases watts, (electrical horsepower.)

If you remove material from the leading edge, torque increases, and amp draw and rpm decreases. If you increase torque to a greater degree than you decrease RPM, your overall watts will increase.

You can gain performance by utilizing the above information. I'd suggest keeping the brush faces symetrical, ie: keep the brush cuts/widths the same for both poles.
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Old 05-17-2007, 11:27 AM
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Originally Posted by Todd Putnam
If you remove material from the trailing edge of each brush, (similar to a "timed" cut) torque and rpm increases, which increases watts, (electrical horsepower.)

If you remove material from the leading edge, torque increases, and amp draw and rpm decreases. If you increase torque to a greater degree than you decrease RPM, your overall watts will increase.

You can gain performance by utilizing the above information. I'd suggest keeping the brush faces symetrical, ie: keep the brush cuts/widths the same for both poles.
Hi Todd,

Is it possible to post a picture / pictures of your examples given above. Would be greatlly appreciated.
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Old 05-17-2007, 02:26 PM
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So when you look into the motor can at the end bell end, the trailing edge is the right hand side off the brushes?
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Old 05-17-2007, 02:38 PM
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The trailing edge is the left side of the brush if you look into the brush hoods

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Old 05-17-2007, 02:57 PM
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If you look at the endbell with one brush to the left and one to the right, the trailing edge will be the top left on the left hand side and bottom right on the right hand side.

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Old 05-18-2007, 04:12 AM
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So is this different for the motors that spring post are on the same side and the post on the angle from each other.
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Old 05-18-2007, 04:14 AM
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I have had a chance to look at a motor, the postive brush needs to be cut on the bottom if you are look at the end bell and the negative is the top?
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Old 05-18-2007, 05:08 AM
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If you're not sure how to do it yourself, see if you can have a word with one of the A main guys at your local club and ask if they can do it for you

Brushes are pretty cheap, but get it wrong and you'll either screw up the commutator or loose performance.
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