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Thread: Cutting a motor commutator & motor tweaks

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Old 09-12-2011, 12:45 PM   #1101
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Heat will just ruin the temper of the springs, unless you plan to bend them after annealing and then retemper to spring steel. You needing stiffer springs for 540 motors? I have a run of XXX heavy springs being made right now.


As to properly spacing an armature, we use the standard three washers. .020" is the chrome, .015" is the steel, and .010" is the brass. The teardowns that I use will typically want between .020 and .030 at the bottom, between one chrome washer or two steel ones. One brass and one steel gets .025". If the arm has a fiber washer on top it will take one chrome and one brass washer or two chrome washers (.040" total top stack, not including fiber washer). A little tap seats them all together after assembly. I go for .005" runout so there is just enough play to give the armature some heat expansion room. Any less and the bearings get axially loaded and wear out fast. Any more and the armature dances around and can beat flat spots in the bearings.
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Old 09-12-2011, 01:27 PM   #1102
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John, Tell me more about these XXX rated springs please
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Old 09-12-2011, 01:50 PM   #1103
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Heat is pointless....bending is the only way really.

If you can find one, the niftech spring benders are actually pretty trick. One of the few things niftech made that wasn't completely worthless.....

Later EddieO
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Old 09-12-2011, 02:07 PM   #1104
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Quote:
Originally Posted by EddieO View Post
Heat is pointless....bending is the only way really.

If you can find one, the niftech spring benders are actually pretty trick. One of the few things niftech made that wasn't completely worthless.....

Later EddieO

Just picked up the left handed spring version of fleabay. Thanks Eddie
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Old 09-12-2011, 02:37 PM   #1105
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Is it yellow or pink?

Later EddieO
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Old 09-12-2011, 02:40 PM   #1106
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Quote:
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John, Tell me more about these XXX rated springs please
x2. How many oz?
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Old 09-12-2011, 02:46 PM   #1107
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Is it yellow or pink?

Later EddieO

Yellow, looking at the photo it will suit the majority of springs I have in stock and use.
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Old 09-12-2011, 02:54 PM   #1108
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Yellow is the correct one for 90% of all motors...I know a lot of people who have found the pink one.........and were bummed to realize it was meant for the positive spring on the stock motors.

Niftech was the only company who really used the left/right hand term for springs.....they are some WEIRD people. They think the entire RC industry conspires against them to supress their products from the mainstream.

Later EddieO
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Old 09-12-2011, 03:01 PM   #1109
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Quote:
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Yellow is the correct one for 90% of all motors...I know a lot of people who have found the pink one.........and were bummed to realize it was meant for the positive spring on the stock motors.

Niftech was the only company who really used the left/right hand term for springs.....they are some WEIRD people. They think the entire RC industry conspires against them to supress their products from the mainstream.

Later EddieO

Their website is hard work with their use of left hand and right hand springs as you say. Not at all easy, if anything they supress themselves!.

Glad I worked it out with the dodgy photo`s. The tool worked out at 49 dollars shipped to the UK.
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Old 09-12-2011, 03:53 PM   #1110
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$49 to bend a spring! WTF? Especially because the controllers we use in the crawlers have adjustable drag brake strength. So why run a super stiff spring?
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Old 09-12-2011, 03:58 PM   #1111
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Cause girls like em super stiff.....duh....

When it comes to spring tension....you can get really anal with it and produce some crazy good performance results. I used to spend hours messing with spring tension on race motors. While I am not as anal with crawler springs, I am still pretty thorough with them.....I do get a little extra anal on the LE motors though.

Later EddieO

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$49 to bend a spring! WTF? Especially because the controllers we use in the crawlers have adjustable drag brake strength. So why run a super stiff spring?
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Old 09-12-2011, 04:07 PM   #1112
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I got that spring tension tester thing from ya, I use it when I do motors. But I don't feel the need to force a brush into a comm that hard anymore knowing I can dial in a ESC, and not have to cut the damn comm even more than I do. Or did, cause it's been a while...

Not too soft, not too hard... Though I have done zero testing with a dyno to actually dial in spring tension...
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Old 09-12-2011, 04:32 PM   #1113
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Brush tension is a fine line of too hard and too soft........it really should be used to minimize brush bounce, but it has also become a band-aid for more drag brake....

Later EddieO
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Old 09-12-2011, 06:26 PM   #1114
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That bandaid is only needed for ESCs without Holmes Hold. It does help every other setup, so some people are willing to take a performance hit in one area to gain in another area. Just like a slanted arm installed in a four magnet can. Efficiency goes to the toilet, but some people like smooth startups enough to use that combo.

We should be getting real spring tension between 13 and 15 ounces with the xxx springs, to be determined when they land. X heavy springs (old 12 ounce / black equivelent) dyno at 10.2 ish ounces.
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Old 09-12-2011, 07:48 PM   #1115
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Which spring dyno are you using?

Later EddieO
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Old 09-12-2011, 09:41 PM   #1116
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Integy. Both of them are reading the old 12oz as 10. Bad units?
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Old 09-12-2011, 09:50 PM   #1117
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Trinity black should read 13-13.4....variation is normal....a trinity silver should read around 10.5-11 usually...

There are two versions of trinity blacks, hopefully they didn't send you the others....

Trinity rates the springs as follows

15.5 oz black
14.5 oz silver
13 oz purple

Later EddieO
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Old 09-12-2011, 09:57 PM   #1118
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My purples come up around 9 on the same meters. Nutz.
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Old 09-12-2011, 10:29 PM   #1119
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My purples usually measure around 9.....sounds more like the meter is fine and you got some of the weaker black springs. You sure they were not the Reedy blacks?

Later EddieO
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Old 09-13-2011, 07:46 AM   #1120
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Most of us in the UK dont have BR-XL`s, so if I can improve my motor`s and other people`s motor`s that I look after all the better for us. I have impressed a few of the UK driver`s with my motor rebuilds

Most shop`s that I ring now think that I am a lunatic when I ask for brushes etc. Mind you they are probably right.
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