09-12-2011, 12:45 PM | #1101 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
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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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09-12-2011, 01:27 PM | #1102 |
Pebble Pounder Join Date: Jul 2008 Location: Tamworth, England.
Posts: 124
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John, Tell me more about these XXX rated springs please |
09-12-2011, 01:50 PM | #1103 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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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 |
09-12-2011, 02:07 PM | #1104 | |
Pebble Pounder Join Date: Jul 2008 Location: Tamworth, England.
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Just picked up the left handed spring version of fleabay. Thanks Eddie | |
09-12-2011, 02:37 PM | #1105 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
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Is it yellow or pink? Later EddieO |
09-12-2011, 02:40 PM | #1106 |
RCC Addict Join Date: Dec 2006 Location: Oak Ridge, TN
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09-12-2011, 02:46 PM | #1107 |
Pebble Pounder Join Date: Jul 2008 Location: Tamworth, England.
Posts: 124
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09-12-2011, 02:54 PM | #1108 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
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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 |
09-12-2011, 03:01 PM | #1109 | |
Pebble Pounder Join Date: Jul 2008 Location: Tamworth, England.
Posts: 124
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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. | |
09-12-2011, 03:53 PM | #1110 |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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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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09-12-2011, 03:58 PM | #1111 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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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 |
09-12-2011, 04:07 PM | #1112 |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
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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... |
09-12-2011, 04:32 PM | #1113 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
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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 |
09-12-2011, 06:26 PM | #1114 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
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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. |
09-12-2011, 07:48 PM | #1115 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
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Which spring dyno are you using? Later EddieO |
09-12-2011, 09:41 PM | #1116 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
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Integy. Both of them are reading the old 12oz as 10. Bad units?
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09-12-2011, 09:50 PM | #1117 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
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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 |
09-12-2011, 09:57 PM | #1118 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
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My purples come up around 9 on the same meters. Nutz.
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09-12-2011, 10:29 PM | #1119 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
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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 |
09-13-2011, 07:46 AM | #1120 |
Pebble Pounder Join Date: Jul 2008 Location: Tamworth, England.
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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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