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HomeAircraftHelicopterHIROBOOther › aligning bearings
02-09-2006 07:15 PM  12 years agoPost 1
helihi

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edgewood, maryland

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hello all i need some help .

im putting the frame together so im putting the bearing for the main shaft and then i put the shaft throw them and then i tighten the screws in the frame, but when i do the shaft gets tight i have tried it many times but i can no seem to get it perfect. is there something im not doing? im useing a new main shaft. what do you think? thanks all.

fly high or fly nothing

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02-09-2006 07:44 PM  12 years agoPost 2
Grant H

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Madison, WI

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How tight is tight?

Mine took a little bit of working, but finally will slide down in the bearings.

Have you tried using a bit of force?

Also, maybe the bearings are not seated well in there. It is possible to have a bearing half cocked and throw the alignment off.

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02-10-2006 04:02 AM  12 years agoPost 3
B.T.D.T.

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NY

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I'm having the same problem too. I've build two EVO's without a problem with a little adjustments and it fine. With this new EVO50 I just got, I'm having a hell of a hard time aligning the main shaft. I spoke to MRC Rep and he told me that I have to be carefull and know when I'm tighten the screws down and how it affects the frames alignment or the third bearing block.

Make sure you are working on a flat surface.

As Grant said the bearing blocks maybe a little off. I've read that somewhere last year on how to assembly plastic frames and filing the bearing blocks because of molding problems on the frames.

Now I'll have to look into that, I forgot all about it.

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02-10-2006 04:31 AM  12 years agoPost 4
helihi

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edgewood, maryland

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thanks for that info. i got it as close as i could it slides in with little resistance. i would like none but iv try everything i could think of. and i did have to file the frames a little and i made the holes in the frame a little bit bigger just a hair and that seemed to help.

i am thinking of getting the ceramic main bearings is anybody useing them??

fly high or fly nothing

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02-12-2006 08:52 AM  12 years agoPost 5
B.T.D.T.

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NY

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I finally did it. It took another 1-1/2 tonight playing and tweaking to get the main shaft bearings all aligned. Can't believe it the total time it took on this step. 4-1/2hours.

Thanks Jeff for your advise.

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02-12-2006 09:01 AM  12 years agoPost 6
Apples

rrApprentice

Brooklyn, New York

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BTDT,

Were you talking about Jason Chan's assembly tips for the Evo here?:
http://www.jason.net/heli/assemtip.htm

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02-12-2006 09:23 AM  12 years agoPost 7
B.T.D.T.

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NY

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Hey Apples,

Great job. That was the article I was refering to. Too bad he never finished the write up. But the frames alginments and bearings point out all possible problems we were having.

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02-12-2006 02:34 PM  12 years agoPost 8
Apples

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Brooklyn, New York

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Then, get busy removing all of the "flash". No misaligning here on the EVO 90.

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02-12-2006 04:38 PM  12 years agoPost 9
B.T.D.T.

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NY

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I did, if you read my earlier post I finally finished my alignment.
But is your EVO90 done yet?

I bet I'll be on the field before you.


Must go build
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Snowman first with my kids,

Then finish my EVO

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02-12-2006 04:40 PM  12 years agoPost 10
mojojo

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Shrewsbury Massachusetts

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helihi, I don't think ceramic bearings are the answer. check out the jason.net link above. He's got some good assembly tips and Pictures. You can get the main mast perfect.

Joe Miller

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02-12-2006 06:21 PM  12 years agoPost 11
helihi

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edgewood, maryland

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thanks for the link, lot of info

fly high or fly nothing

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02-13-2006 12:34 AM  12 years agoPost 12
JoeHeli

rrApprentice

Forever Home of the "WTC" NYC!

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Apples and BTDT...
Less Bullsh$t and More Building...

Geez I have to be tough on you guys even off the field

CrazyJoe

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02-13-2006 02:12 AM  12 years agoPost 13
B.T.D.T.

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NY

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CrazyJoe,

What 90 are you building now?

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02-13-2006 03:35 AM  12 years agoPost 14
JoeHeli

rrApprentice

Forever Home of the "WTC" NYC!

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Evo 90...Building together with Roy. I love Hirobos. I hate Building but these are the Nicest ships to put together.
Looking forward to Flying this one and see how she compares to my Eagle 3.....
I heard your bring back to life a shuttle 30?

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02-13-2006 10:14 AM  12 years agoPost 15
dgshaffer

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New Jersey

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i am thinking of getting the ceramic main bearings is anybody useing them??

I just installed a set of Boca main and starter shaft ceramics. These things feel really smooth and precise. I should have it back in the air by the weekend. I'll let you know how it feels once it's spooled up.

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02-13-2006 11:19 AM  12 years agoPost 16
davehour

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Guayama, Puerto Rico 00785

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Hi:

I do pay attention to this, but thinking about it, don't you think the frames and blocks will adapt to the mainshaft when exposed to the engine vibrations? I doubt the frames will hold exactly the way they were positioned.

David

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02-14-2006 08:11 AM  12 years agoPost 17
SubSailor

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Austin, TX.

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Well this worries me a little bit. When I first tried to install my main shaft it was off just enough that it wouldn't slide through the lower bearing block, it wasn't off much at all, maybe .001 or .002 if that. I loosened up the screws a tad and with a little bit of muscle it popped in. I then tightened the screws back up and the shaft spins freely. Think I'm ok with the way I did it?

Fromeco Field Rep.
A day without sunshine is, well.., alot like night time.

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02-15-2006 03:35 AM  12 years agoPost 18
SubSailor

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Austin, TX.

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anyone have any thoughts on my question above?

Fromeco Field Rep.
A day without sunshine is, well.., alot like night time.

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