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T-REX 450 › Search complete need a little help on an SE
09-15-2007 01:55 AM  10 years agoPost 1
cgheli

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South Florida-USA

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I just received a Trex SE ( after much debate on the Mini Titan or a Trex). I started putting it together and noticed the tail drive gear is warped. The little blue gear. I have read a few places where align has a problem with that. I have flown Raptors for a few years and I am just getting into an Electric Heli. I had a HB elite years ago, but it was fixed pitch. Has anyone had this problem and if so how big of a deal was it? Did you install it and try and fly? If so what was the result. I am bumming, I waited 3 days for it to show up and ten minutes into the build I find the gear. Any help from a Trex ninja would be great. Thanks in advance if you can help.

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09-15-2007 02:09 AM  10 years agoPost 2
Boidman (RIP)

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This has been discussed ad infinitum and nauseum. Search harder, then provide screenshots of each sequence of search terms used. Get a notary forumic to verify all your efforts. Then place $200 into the "forum knowledge escrow account." Buford will then begin to monitor your every move, and maybe you will receive help from those ninjas of which you speak.

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09-15-2007 02:10 AM  10 years agoPost 3
Wingman77

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Pulaski Tennessee

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I guess it depends on how bad it is warped. I would suggest building the restof the heli and get a new gear, I believe you can get one for about $5 it may save you in the long run.

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09-15-2007 02:19 AM  10 years agoPost 4
cgheli

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South Florida-USA

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Thanks for the help Boidman? or not. Wingman I will see if I can get the gear off and replace it. Thanks

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09-15-2007 02:22 AM  10 years agoPost 5
Boidman (RIP)

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For 75 of those dollars now showing in your account, I will tell you that I have never seen one of those small gears below the pulley that was out of round to any degree that mattered, at all. Some have not been quite flat, but that didn't matter either.

The closest thing to an issue has been that those gears are not always perpendicular to the shaft, such that with a perfect autorotation gear, the mesh would travel up and down the width of the teeth when rotated.

BONUS EDIT: The little bit of 'gear walk' I have seen, was never an issue.

Be careful with any further questions, regardless of who answers!

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09-15-2007 03:30 AM  10 years agoPost 6
cgheli

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South Florida-USA

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The warp is up and down which would cause the walk you speak of. I will install it and see how bad it is when it is meshed up with the other gear. Thanks for the info.

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09-15-2007 03:34 AM  10 years agoPost 7
Boidman (RIP)

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The autorotation gear is going to move up and down some when it is turned, too. Lay the tail drive assembly on its side and turn it by hand with a pencil or screwdriver or something up near the gear. I bet the 'wobble' is less than 1/32".

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09-15-2007 03:45 AM  10 years agoPost 8
cgheli

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South Florida-USA

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Good idea. I will try it and measure the up and down distance. Thanks

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09-15-2007 03:50 AM  10 years agoPost 9
Boidman (RIP)

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This is strictly a fiduciary relationship, please don't sully it with trivialities.

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09-15-2007 05:22 AM  10 years agoPost 10
HHawk

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Gardnerville Nv.

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Thats funny I never even looked at the up and down in the auto gear. But I just did and its just as you say. But in flight it hasn't been an issue. The main gear is also a bit warped.
It flies fine though, if you order a new one it will most likely be the same. If Im wrong, please someone let us know where we can get them

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09-15-2007 05:33 AM  10 years agoPost 11
Boidman (RIP)

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If that 'wobble' is the only issue, and things like the main gear doesn't travel down into the non-cylindrical portion of its pinion or that little ridge of plastic on the top of the tail drive gear, then I don't see any problem. At speed, the contact between various gears will actually flatten the plane of rotation. No, honest, I ain't shytin' you.

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09-15-2007 05:47 PM  10 years agoPost 12
cgheli

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South Florida-USA

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I tried installing the gear and with everything put together and the little blue tail gear moves up and hits the main gear when it turns on the warped spot.

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09-15-2007 05:58 PM  10 years agoPost 13
Boidman (RIP)

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The Home Stretch

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How much does the little gear wobble? How much does the main gear wobble? I would say that with 1 out of 10 of these kits, the one-way bearing needs to be pushed down into its fit further so that the main and auto gears ride higher in the frame.

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09-15-2007 06:16 PM  10 years agoPost 14
docjoe

rrElite Veteran

Stockton, CA United​States

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When the time comes, maybe sooner than later, just replace the main gear and autorotation gear with the new darker blue (or white) main gear. The are much stronger, are much rounder and shouldn't warp. Time to start the spending, it'll happen sooner than later!

Joe
We haven't seen Colonel Angus around these parts for years!

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09-15-2007 07:03 PM  10 years agoPost 15
cgheli

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South Florida-USA

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My main gears are fine. It is the small blue tail gear that meshes with the main gears that is warped pretty bad. I am tempted to grind off the gear but I think I just need a new set up. I have just checked the site where I bought it and they do not sell the entire setup just the gears. The problem is I have the metal bearing braces and I am not sure how to get the middle one out.

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09-15-2007 07:36 PM  10 years agoPost 16
docjoe

rrElite Veteran

Stockton, CA United​States

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If you're removing the tail drive gear from the shaft, you need to break the loctite that's holding it together. Use either a micro torch or heat sources such as a lighter to burn off the Loctite. Then you need a pinion puller to pull it off.

Joe
We haven't seen Colonel Angus around these parts for years!

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09-15-2007 07:59 PM  10 years agoPost 17
helimatt

rrElite Veteran

Lafayette, IN

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Plastic gears respond very well to being boiled and then constrained in the proper shape to get a warp flattened out. The bearings will handle this okay, but you'll need to apply proper grease to them after drying them out.

Never, ever, ever, ever give up.

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