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MSH Mini Protos MSH Mini Protos Helicopter Support Forum |
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05-10-2014, 02:31 PM | #1 (permalink) |
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Join Date: Sep 2011
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Y-support bearing keeps going bad
Hi,
Would like to ask for your advice. A few months ago, I built a new Mini Protos. Setup is not as important for my question, but still: YGE stock ESC(from my previous Mini Protos) 6S MSH motor MKS 92a+ cyclic servo's MKS 95i tail servo Spartan Vortex The problem is this. The maiden of this helicopter was with a different motor, the Scorpion 2520 1360kv made for the Warp. I changed the motor shaft in order to run it on the MP. However, I screwed up, the shaft wasn't perfectly straight in the motor. This caused a lot of vibes and it didn't fly right. Tried to get it straight, didn't work right. So I replaced the motor with the MSH Scorpion motor, and changed the Y bearing, since it went bad due to the shaft going round at an angle. In fact, I replaced the Y-hub completely. However, in flights after that, it keeps wearing out the bearing in the Y motor support. The motor is replaced and tracks fine as far as I can see. When I make it spin and view from the top, it stays in one spot perfectly. And yet..in 20 flights I've had to replace the bearing 3 times :S. So, something is obviously wrong, but I have no clue what. Any idea's would be most welcome.
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Gaui X3, Gaui X5, Gaui X7, Heli-X, Futaba 14SG |
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05-10-2014, 03:49 PM | #2 (permalink) |
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Join Date: Dec 2011
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Well I can say that those bearings are particularly crappy and sometimes you can put a new one in and it doesn't last very long at all, but other times you can get a bit of life out of them.
Eventually I think I'm going to convert to full 4mm shafts with no circlip groove and then do away with the y support & counter bearing.
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Mini Protos, Voodoo 400, Protos 380, Protos Leggero 700 & 700X, Diabolo 700 |
05-10-2014, 04:31 PM | #3 (permalink) |
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this is how I setup the y bearing on my mini p and they seem to last a long time, set the tension on the belt , as per the manual, I have it a little looser but no matter, leave the y bearing bolts loose and run the motor up, with or without blades I don't think it matters, just for a few seconds or so, this should centre the bearing on the main shaft, tighten up the y support bolts and you should be good to go.
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05-10-2014, 09:40 PM | #4 (permalink) |
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Join Date: Apr 2010
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Yap. And lot of people adjust there belt tension by just loosening the bolts in the y support. Not the way to do it! You should lift the y support off the motor then adjust belt tension and lock the motor in place. Then reinstall the y support and as above, leave the bolts semi loose and run the motor up for a few seconds and then lock in the y support. Any amount of side load on the tiny y support bearing induced during install will wear it out fast!
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05-11-2014, 02:48 AM | #5 (permalink) |
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Join Date: Dec 2011
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I like that method, probably would work better than what I've been doing and that is just turning the motor a bunch of times by hand with the y support bolts loose, but it actually doesn't slide that easily so, it could be better to drop it onto the motor shaft after belt tension has been set.
I reckon you'd only need to spool the motor for a maximum of two seconds though.
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Mini Protos, Voodoo 400, Protos 380, Protos Leggero 700 & 700X, Diabolo 700 |
05-11-2014, 04:03 PM | #6 (permalink) |
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Thread Starter
Join Date: Sep 2011
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Y-support bearing keeps going bad
Thank you all so much for the tips. Now I might be able to get this setup right and really have some fun with it!
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Gaui X3, Gaui X5, Gaui X7, Heli-X, Futaba 14SG |
09-01-2014, 01:54 AM | #7 (permalink) |
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Join Date: Dec 2013
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My turn...
Interestingly enough, the manual doesn't specify a separate part number for this bearing - all I see is two 3x6.5x2.5 (MSH41069) on the pinion itself.
Is the Y support bearing the same? MSH sells the Y support whole (with bolts, washers and the bearing, part #MSH41088), are they suggesting that I should just buy all of it at once? Doesn't seem to make much sense to me...
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09-01-2014, 11:16 AM | #8 (permalink) |
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Join Date: Aug 2013
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The bearings in the pinion and in the Y support are the same.
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"Beater" Mini Prôtos stretch 6S : Scorpion 2520-1360kv, Edge 353SE "Princess" Goblin 570 stretch 12S : Xnova 4025-560kv, Cyclone 615 FrSky Taranis - Heli-X 5 - MKS, YGE, SK540 - Yamaha XJ6F |
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