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Old 02-23-2020, 08:14 PM   #1 (permalink)
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Default How anal are we being lining up the three bearings?

How anal are we being lining up the three bearings?

Should I be striving for the main shaft to drop through all three by its own weight, or is it OK to have to push it lightly through the bottom one?

Rick
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Old 02-23-2020, 09:56 PM   #2 (permalink)
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That’s the best I could get from mine as well, the bottom wouldn’t align by just a wee titch, send it!

Steve
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Old 02-23-2020, 09:59 PM   #3 (permalink)
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I squared the frames up as best possible, and still had slightly resistance pushing the shaft thru the bearing blocks. Mine fly’s great!
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Old 02-23-2020, 10:09 PM   #4 (permalink)
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there is actually a point when the frames are built, that the shaft will fall through.. but you have to twist slightly and miss align them.. not real world stuff.. doing that, I could get it to slide through very easily.. but I just squared the frame and had slight resistance on the shaft.. like everybody else.
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Old 02-23-2020, 10:55 PM   #5 (permalink)
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Keep an eye out for tail servo mount issues, I had one that was very loose and had to put 3 wraps of scotch tape on it so it would hold tight.

Steve
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Old 02-23-2020, 11:48 PM   #6 (permalink)
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I want them lined up a perfect as I can get. As long as the shaft fall through the bearings with it's own weight, I'm satisfied
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Old 02-24-2020, 05:55 AM   #7 (permalink)
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Quote:
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I want them lined up a perfect as I can get. As long as the shaft fall through the bearings with it's own weight, I'm satisfied
I hate you!
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Old 02-24-2020, 06:51 AM   #8 (permalink)
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I used to try and get the 3 bearings to line up with a different model. It was a real pain doing up the frame screws a little at a time just for the final twist of a screw to tweak the frame out of square.

Probably only a micron here or there used to drive me to distraction.

I wish you the best you achieve the perfection you seek.
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Old 02-24-2020, 07:10 AM   #9 (permalink)
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Quote:
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I want them lined up a perfect as I can get. As long as the shaft fall through the bearings with it's own weight, I'm satisfied
Well if the frames are square, it won’t.. for whatever reason.
So I hope you’re satisfied but you might be upset when it doesn’t fall through
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Old 02-24-2020, 08:16 AM   #10 (permalink)
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I think your goal should be to get as close as possible. It's the bottom bearing that seems to hang just a little when you drop it. You will adjust the bottom later in the build so it kind of throws that one off or at least it will change once you work out any vertical play in the shaft.


A little story. When the new OWBs were sent out I threw mine in and went to fly and had a serious vibration problem, to the point of not really able to get up to full speed to lift off. Ended having to take the whole lower off and getting the bearings re-aligned to fix the issue. In frustration, I removed every single screw and built it over. So work to get as close as possible. Snug all the way around, drop the shaft, fully tighten 1-2 and check shaft and repeat until complete. If you tighten one and the drop changes, stop and correct it.
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Old 02-24-2020, 08:45 AM   #11 (permalink)
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I'm not!!!! AS you fly the shaft is going to flex and load and unload all three a lot. so I don't worry too much about a slight side load.
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Old 02-24-2020, 12:40 PM   #12 (permalink)
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Having a little bit of side load is actually a good thing.

I don't remember which episode it was but on the tellarotor podcast they said if your main shaft just drops in perfectly it can slip in the bearing. One of them actually had the main shaft wear down from that.
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Old 02-24-2020, 03:09 PM   #13 (permalink)
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I could get mine to drop right through but as said you have to adjust the lower bearing mount later. So after installing the main gear / tail gear with tail belt lose I could get my main shaft to slide fairly easily by hand through all three bearings and oneway sleeve as I slowly tighten the bolts in lower bearing mount to remove up/down play. Took me a few tries but did get it to feel smooth sliding main shaft by hand.

I also install and removed the bolt assembly through main shaft and one way sleeve several times during this process.
After finally getting it to feel smooth, I could take the main shaft all the way out and slide it right through all three bearings and one way sleeve with ease.
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Old 02-24-2020, 06:38 PM   #14 (permalink)
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OK, sounds like I should leave it for now. Its pretty good already.

Rick
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