weird bearing noise out of turnigy d2822 bl motor help!

[Spence]

Hi all, I just loaded up the bearings in my motor with a drop of pellet gun oil, and they still sound weird. Is this a normal sound? I mean it sounds different with a propeller on it. Let me know what you think: https://www.youtube.com/watch?v=2E5vx2RQXCE&list=UUcv0oGy7ufCkfjCBxVz05pw


Thanks,
Spence

 

[mjmccarron]

Hi Spence,
I'm not sure if I'm hearing the same thing you are but I don't hear anything really bad here. It sounds like there is a very small amount of chatter which can be caused by a couple of things. First try pulling the bell back and forth. Is there any noticeable play? There should be none to just a tiny bit. (<.005" or there about) A little is ok and is actually better than having it tight. Tight would be hard as you would have to assemble the motor in a clamping fixture so don't worry. A little extra play can cause the chatter sound I'm hearing. You can loosen the grub screws and press the back end of the shaft while holding the bell on tight to reduce the end play. I wouldn't bother but it's up to you. Another thing could be a damaged bearing usually caused by an impact. You can tell if this is the case by rotating the motor by hand and pay close attention to the feel. It will feel rough in spots. Roughness can also be dirt in the bearing but with sealed or shielded bearings its not likely. I would carefully check it for endplay and roughness. Either way, running it may solve the problem as the parts get back into a broke in state of being. The main thing is to watch if it gets worse with use. Honestly, if its bearing damage you won't hurt it any worse by using it. I really don't hear anything in your video that's alarming.
Hope this helps,
Mike

 

[Spence]

there is some end float pulling the bell towards the tip of the prop, but there is literally no play side to side. Is that good or is that bad? Well, there is no noticeable amount of extra resistance in the ability of the shaft to spin. When and if this motor has really worn out bearings, would this suppo motor be a good next choice? http://www.altitudehobbies.com/brus...rushless-motor-370-28-26-1100kv-suppo-2208-17

 

[mjmccarron]

There should be none sided to side and the back and forth explains the noise. You should be in good shape. If you want to you can adjust the end play out as I described above but I wouldn't bother. Just make sure I turns smooth and you're good to go.

Mike

 

[Spence]

it is pretty smooth, like it makes some noise when I spin it over by hand, but other than that its fine. Both bearings spin freely for the most part, I took it apart and tested the front one, still spins freely for 3 seconds but makes a little bit of noise. is this fine?

 

[mjmccarron]

Sounds good to me. If there aren't any catchy spots their still good. Tunigy doesn't use really good bearings to begin with and I've seen brand new ones that make some noise. They usually wear in and quiet down. That's another reason to not unnecessarily take the motor apart. When you do you disturb the fit and they have to wear back in. I think you're done on this one. Nice job!

Happy flying,
Mike

 

[Spence]

so its good?

 

[mjmccarron]

I believe so. It should quiet dow with a few flights. If not it doesn't sound like anything to worry about. You did a good job on the shaft replacement.

 

[Spence]

Thanks, I know this is likely a long ways away from happening I hope, but when the bearings really do go, can they easily be replaced, or should I just buy a suppo motor?

 

[mjmccarron]

Replacing the bearing isn't too hard but the cost is probably more than a new motor. At around $20 for a motor I'd just replace the whole thing. But, if you find a good deal on bearings it's one more accomplishment for you to replace bearings. They are easy to remove but you have to be careful pressing the new ones in taking care not to excessively side load them. You can tap the old ones out but should never tap or hammer the new ones in. They need to be pressed in carefully. If you decide to do it down the road, let me know. I'm happy to help.
It stopped raining here. I think I'll go run some batteries down.
Have a good one,
Mike

 

[Spence]

Thanks, I may replace the bearings when they wear out. The problem is I don't know the size. Maybe I could ask hobbyking they may know. The suppo motors off of altitude hobbies have all replaceable bearings and the only thing you have to do is go to the bearings, shafts and accessories, and look for your motor number. The bearings are really cheap, like $5 or so. Well, it finally stopped snowing/sleeting out, and now its starting to dry up hopefully, so i may go fly too. The sad thing is I can't drive yet so I can't fly when I want to.

 

[Ryan@DroneKits.US]

I have no idea what size bearings those Turnigy Motors are using. If you can get them out you can easily measure them with a set of calipers. I then use c-clamp to carefully press the bearings back into place. Be sure to measure both in metric and standard. I was very surprised to find our motors manufactured in china utilize standard size bearings.

For our motors we found replacements through these guys in California for only $0.99 each.

http://www.fasteddybearings.com/1-8-x-5-16-x-9-64-rubber-sealed-bearing-r2-5-2rs/

Hope this helps...good luck.

 

[Ryan@DroneKits.US]

I just found this on the hobby king forums for your turnigy motors.

hey, can anyone quote the bearing size it has. i got my one bearing damaged in first crash. shaft is also bent slightly.. i tried 4*8*3, but inner collar is too loose..

http://www.hobbyking.com/hobbyking/store/__18967__D2822_17_Brushless_Outrunner_1100kv.html

4 comments. Reply..
kevltan 4/23/2012 6:21:00 AM
1/8" x 5/16" x 9/64" Metal Shield Ball Bearings - not metric!

It looks like you could use the same bearings from my link above.

 

[jhitesma]

I've replaced bearings on SunnySky 2204's and DYS 1806's - The hardest part is getting the original bearings out. But if they're bad and you aren't trying to save them then it's a lot easier. Bearings are cheap the standard shielded metal bearings used in most motors are about $1 each, nicer bearings with ceramic balls can be had for around $5 each...though you can get really crazy and get super nice all ceramic bearings for way more than motors cost....but that would be overkill.

I used fasteddies bearings in the SunnySky's but wasn't impressed by them. They didn't seem quite as smooth as the original bearings (and it later turned out the noise I thought was bearings was likely a dying ESC.) They were far better than the bearings I got off ebay for the DYS motors which were so bad I didn't even use them - they were only shielded on one side, felt like they had sand in them and looked almost rusty. The seller tried to tell me that was normal and they were as described - but their photos showed nice shiny new bearings with seals on both sides - had to dispute that one and they fought it for a week trying to claim they were good bearings. One of them was missing a ball which had wedged itself into the race of another jammng it! Crazy.

AvidRC.com has really nice bearings at a great price ($1 a bearing) and are who I'd suggest going with if you have a choice. I replaced the horrible ebay bearings with some from avid and they did get my DYS motors spinning noticeably smoother than the stock bearings...but the motors still make a funny noise that I can't figure out as nothing seem to be rubbing and the bearings are smooth as silk.