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Old 09-09-2002, 12:31 PM   #766
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Hey Kraig -- like how long do you run the new brushes in before re-cutting the com ?

Thanks.


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Originally posted by Kraig
coolrcdad, the Putnam brushes are a little different than any other brush out there. What a lot of people recommend doing is to run the brush in the motor so that the serrations wear down a little bit. Then go ahead and cut the com and run the motor for a little bit again to reseat the brushes and then you are good to go. What happens is the brush is hard enough it grooves the com where the serrations are so that is the reason behind break in, cut, and break in again. I am sure you will be pleased with the results.
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Old 09-09-2002, 01:06 PM   #767
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TeamGoodWrench I normally cut my stock motor every 2 or 3 runs. I measure the com and then get teh serrator that is the closest to the size of my com. Then I re-serrate the brush surface and break the motor in for about 2 minutes at 3 volts. As long as my brushes don't change color then I keep my same brushes in.

RaceTech makes the different sized serrators. I think I have 5 sizes and that covers from 2.90 to 2.65 or so. The brushes brake in alot faster that way.

Brian
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Old 09-09-2002, 01:09 PM   #768
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Sorry -- my question was if I have new brushes and Kraig's post says to break them in until the serrations are gone -- then re-cut the com -- and finally reseat the brushes again.

How long does the FIRST brush seat usually take ? i.e. to wear off the serrations.
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Old 09-09-2002, 01:27 PM   #769
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I never run my motor til the serrations are gone. Some people do and some don't. I guess it is what works for you. I like the serrations being on as you gain a little more rpm and less friction on the com. It also comes down to your car setup. If you have a really good cornering car then you can get away with less torque.

If you ask 10 people you will more than likely get alot of different theories.


acloco how do those Tribo com drops work for you? I was on Jims website and read the little write up he had on them. He has some interesting theories on their. Very interesting to me. He has me thinking that is for sure.


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Old 09-09-2002, 01:49 PM   #770
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So far so good. The Tribo REALLY cuts down on brush wear. IMO!!
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Old 09-09-2002, 02:18 PM   #771
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TeamGoodwrench, I usually wait until I can see a flat spot on the serration and it is the entire length of the brush. Then I will go back and cut the com. I re-install the brushes and then run the motor for about 1 minute to make sure the amp draw has stabilized. You should be set to go.
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Old 09-09-2002, 02:28 PM   #772
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acloco thanks. I will look into getting some.
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Old 09-09-2002, 05:44 PM   #773
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Hey All,

Was wondering if someone here could put a little better explanation or way of doing something...

I have Big Jim's book, I read his thread all the time but the explanation on Brush hood alignment just hasnt sunk in for me yet...

My basic question is this...what am I looking for, I cut the comm, install new brushes and then what/how do I go about knowing whether the hoods are aligned...like I said I have read the Book several times and Big Jim's explanation just doesnt do it for me...

Any bits of info would really be helpful...

Thanks!
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Old 09-09-2002, 07:19 PM   #774
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TigeRyan,
I am kind of in the same boat that you are in but this is what I was able to intuit.

1 start with new brushes (I like non-serrated ones for this because it gives me more time to make corrections.). I wouldn't even bother to cut the com at this point.

2. Put the motor together and run the motor on a three or four cell pack for a min or two. (not as long as it takes to seat the brushes because it will be hard to see what you have done.).

3. Pull out the brushes and look at them. Where is the point of wear? (Big Jim says something about using a sharpie to make the old surface darker, I have had mixed results with this.)

4. If the hood is aligned the wear will be dead center in the middle of the brush (or evenly along the outside edges). If the wear pattern is too far in, out, up, or down then you have to bend the hood in such a way as to change the contact patch and move it over center.

5. Repeat steps 2-4 until the wear pattern is dead center. This is definately trial and error.

6. When all is as it should be cut the com, put in good brushes and wear them in all the way.

I hope this helps. BTW, if i am way off base on this someone please correct me.
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Old 09-10-2002, 04:24 AM   #775
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Racin Rev: Nice job. Try 766 brushes to set the hoods. No serations. Also I use fiberglass com stick to clean the brushes between tries. gets rid of the wear marks.

I swithched to Tribo ~ 1 month ago, also read Jim's forum (300M). Tribo works good for me less wear with 4499's, putnhams, and 767. Geared up 1 - 2 teeth also. Was reminded last week that I had all the power I needed in the main by my competition. LOL, he was right car was smokin. Now I need more pratice. His 8+ years to my 1 shows.
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Old 09-10-2002, 06:11 AM   #776
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Ok, I am really going to show how far this mental block goes...

By wear mark you mean like a discoloring, or will it actually be a darker part of the brush, or a not shiney part of the face of the brush....

I am just really confused on this one...
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Old 09-10-2002, 06:31 AM   #777
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TR: You set the hood with new brushes. By wear I mean the shinney spot the com will put on the brush. Make sense?
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Old 09-10-2002, 02:36 PM   #778
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rc nitro is right in the fact that 766 are the best to use in in break in. their face comes factory dull but it does have a polish in it. when brush makes contact for not even 30 seconds, you can check hood alignment. one problem with this is that it may not be your brush hood, but your lathe that doesnt cut perfectly straight. i know mine isint perfect, and quite a few others arent either. including hudy lathes incase your thinking that "they cant be" so make sure befor eyou waste 5-10 min checking hood alignment when your comm isint perfect. users beware.
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Old 09-11-2002, 05:09 AM   #779
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I did run into the alignment problem with the cobra. I got the Hudy and had it aligned. Comms look great now under high mag, you can see the cut as described on the Cobra industires page someone posted. Had a bud that is a machinist do the alignment Good point shrekair!
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Old 09-11-2002, 06:33 AM   #780
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Hey Everyone,

Really appreciate all the information, going to get a set of 766's, do I need to solder them in, or can I just put them in the hoods and just have them touch? I would assume that I can use one set several times over correct?

Thanks again!
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