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› Carbon protos 500 main shaft alignment
10-13-2011 03:13 PM  7 years agoPost 1
KDFI

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Acampo, Ca- USA

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what is the best way to align the mainshaft so it slides freely up and down? i have all frame screws loose and the servos on the block slightly loose. i just cant get the shaft to slide up down smoothly... should i use fine wet dry sand paper on the main shaft?

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10-13-2011 03:28 PM  7 years agoPost 2
alexf1852

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Inverness, FL - U.S.

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It doesn't have to go up and down real smooth. But it is the only way to tell that everything is lined up. I suspect that tolerances of the bearings and anodizing(?) of the main shaft will affect how smooth the shaft travels up and down. You can use a very fine wet sandpaper and lightly sand. But don't sand too much, otherwise your shaft will turn inside the bearing and not with the bearing. This will eventually lead to lateral play.

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10-13-2011 03:35 PM  7 years agoPost 3
KDFI

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Acampo, Ca- USA

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thanks! good thing i didn't sand it.

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10-13-2011 03:45 PM  7 years agoPost 4
KDFI

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Acampo, Ca- USA

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What should I tighten first; The servos to the block, or the CF frames?

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10-13-2011 04:14 PM  7 years agoPost 5
rcnut

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Rockford, Illinois

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I ran into the same issue when I put mine together. To rectify the problem...I loosened the cyclic servos and most of the frame screws. Then I started with the main shaft bearing blocks. Made sure the mainshaft would slide freely as I tightened each one a little at a time. Once all the bearing blocks were tightened, then I would tighten all the frame screws keeping the frame square to my work bench.

And last, I tightened the servo screws while checking the mainshaft. For me, this worked great. I can slide the mainshaft into the bearing blocks, turn the heli upside down and the shaft will slide out on its own.

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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10-13-2011 09:01 PM  7 years agoPost 6
Funknrock

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San Marcos, CA

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+1 to rcnut's system. i do this with pretty much all my helis. i put the main shaft in the bearing blocks while tightening and checking. i'll try and keep it there throughout the build too.

My crashes are cooler than your flying! ;^)

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10-13-2011 09:16 PM  7 years agoPost 7
alexf1852

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Inverness, FL - U.S.

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Also, while you have the screws loose, move the main shaft in a circular motion to get everything aligned.

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10-14-2011 05:18 AM  7 years agoPost 8
KDFI

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Acampo, Ca- USA

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RCNUT,

Thanks!! That was some awesome info! Worked like a charm!

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