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Old 02-27-2018, 07:32 PM   #1 (permalink)
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I just received my brand new trex 500 tail boom case. New gears as well. Only thing not new are the two bearing that the long umbrella gear sits in. One bearing is kind of scratchy, but the two gears are rubbing hard for about 1/4 turn every rotation. This only happens when I put the case together. When the two halves are apart, everything is smooth. Ive been looking and looking for anything to figure out what is going on. I wouldnt be comfortable to put this in the way its turning. Any suggestions?
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Old 02-27-2018, 09:19 PM   #2 (permalink)
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Originally Posted by laflyer90 View Post
I just received my brand new trex 500 tail boom case. New gears as well. Only thing not new are the two bearing that the long umbrella gear sits in. One bearing is kind of scratchy, but the two gears are rubbing hard for about 1/4 turn every rotation. This only happens when I put the case together. When the two halves are apart, everything is smooth. Ive been looking and looking for anything to figure out what is going on. I wouldnt be comfortable to put this in the way its turning. Any suggestions?
Maybe switch those two bearings around? front on in rear the rear in front it could help maybe but sounds like its time to get two new bearings. honestly don't think i would had replaced any of that w/o replacing the bearings. but i hate taking stuff apart.
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Old 02-28-2018, 05:16 AM   #3 (permalink)
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Are you sure the bearings are fully seated on the gear? That would be the first area I would check. I don't have a 500, but the bearings on the 450L were pretty tight on the gear.

The second would be to look if you have some flash or malformed case. Any plastic that may be causing a mis-alignment of the gears?

Those are my guesses.
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Old 02-28-2018, 05:26 AM   #4 (permalink)
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So it's smooth in one half...what if you lay all the bearings in the other half? Like Macdad said, maybe there's a bit of plastic in the bearing track that is skewing the bearing?
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Old 02-28-2018, 06:10 AM   #5 (permalink)
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Tried all of that. I ordered new bearings from amain...so now I get to wait another week or two for parts to come in, which gives me a week or two to freak out about this not working.
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Old 02-28-2018, 06:40 AM   #6 (permalink)
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Make sure the umbrella gear is fully inserted. Push it in hard!! If itís out even a little it will do this.

It could also just be the gears. Align TT gears suck.
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Old 02-28-2018, 07:10 AM   #7 (permalink)
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I had this same exact issue with my 700x! How is the gear mesh? Really tight? I ended up buying different size shims to set my gear mesh as the shim that came in the kit made the gear mesh super tight! I found my shims at Amain in the car section. I still have a slight rough spot like you describe but I have around 30 pretty hard flights and not a single problem. If I was you, I would fly it and watch for vibrations and abnormal gear wear.
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Old 02-28-2018, 08:16 AM   #8 (permalink)
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I'm going to go ahead and wait for these bearings to come in. Install all brand new parts. If I can't get it to be perfectly smooth then I'll just put it all back together and do just that...look for vibrations while hoping all is smooth.
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Old 02-28-2018, 05:02 PM   #9 (permalink)
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More than likely has nothing to do with the bearings and I would suspect it is one of the gears is out of round/tolerance.

If its not that bad just run it and the gears will "run in" and smooth out. These are molded plastic pieces with not great tolerances.
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Old 02-28-2018, 05:26 PM   #10 (permalink)
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The injection molded Align bevel gears are commonly out of round. The solution is to turn one of the gears until the high and low spots match up on both gears. Somtimes you luck out but most of them will have this to some degree.
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Old 02-28-2018, 07:10 PM   #11 (permalink)
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Quote:
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The injection molded Align bevel gears are commonly out of round. The solution is to turn one of the gears until the high and low spots match up on both gears. Somtimes you luck out but most of them will have this to some degree.

+1

Its funny, I got laughed at for suggesting this exact solution in a different thread.
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Old 02-28-2018, 07:15 PM   #12 (permalink)
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Yea I'm not thinking it's the bearings either. I feel as if the new tail boom case is off as well. Where the cutouts are for the bearings to sit.
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Old 02-28-2018, 08:01 PM   #13 (permalink)
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Injection molding isn't perfect by far.
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Old 02-28-2018, 09:39 PM   #14 (permalink)
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Injection molding isn't perfect by far.
It can be much better though many other helis have injection moulded gears with little and often no visible wobble while the Align ones typically wobble like a top. It's very irritating because I know they can do better than this.
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Old 02-28-2018, 10:21 PM   #15 (permalink)
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one way to get to mesh better is to use some good rubbing compound for automotive paint, put some on the gears, NOT a lot, turn by hand , this will set the gears into each other, use fine stuff. Then disassemble any clean thoroughly with soap and water use compressed air to blow out dry and make sure to oil up everything good. You should not use too much and be sure to turn by hand only, do not want to get that stuff in your bearings.. This method has worked good for me in R/C cars too back in the day of all plastic gearing. Don't know why they just don't use machined Delrin
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Old 02-28-2018, 11:11 PM   #16 (permalink)
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Quote:
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one way to get to mesh better is to use some good rubbing compound for automotive paint, put some on the gears, NOT a lot, turn by hand , this will set the gears into each other, use fine stuff. Then disassemble any clean thoroughly with soap and water use compressed air to blow out dry and make sure to oil up everything good. You should not use too much and be sure to turn by hand only, do not want to get that stuff in your bearings.. This method has worked good for me in R/C cars too back in the day of all plastic gearing. Don't know why they just don't use machined Delrin
.... 12 years in this hobby and never once have I heard or thought about doing this and its brilliant. I am a detail nut when it comes to my cars so Ive got plenty of compound and polish to try out AND of course a brand new set of 550x red gears that are super rough to try it out on. Thank you for the great idea
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Old 02-28-2018, 11:29 PM   #17 (permalink)
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.... 12 years in this hobby and never once have I heard or thought about doing this and its brilliant. I am a detail nut when it comes to my cars so Ive got plenty of compound and polish to try out AND of course a brand new set of 550x red gears that are super rough to try it out on. Thank you for the great idea
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Old 03-01-2018, 02:49 AM   #18 (permalink)
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oDon't know why they just don't use machined Delrin
Because that would be more expensive.

STO used to make aluminum TT gears for the Trex 600 but they stopped making them because nobody bought them.
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Old 03-01-2018, 06:43 AM   #19 (permalink)
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Quote:
Originally Posted by Atomic Skull View Post
The injection molded Align bevel gears are commonly out of round. The solution is to turn one of the gears until the high and low spots match up on both gears. Somtimes you luck out but most of them will have this to some degree.
Yup, I had the same issue on my 450L, and the tail of the Blade 130X

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Old 03-01-2018, 08:42 AM   #20 (permalink)
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When turning the gears by hand when using the rubbing compound...hard turning? Soft easy turning? Slow or fast? This idea seems to be plausible and I wouldn't mind trying it.
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