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Home✈️Aircraft🚁HelicopterSynergy R/COther › Main Shaft runout
09-09-2006 05:40 PM  14 years ago
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Spookyeng

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Meridian, ID USA

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Main Shaft runout
I have posted previously about the wooble in the main-shaft. I checked it today and it was .010 at the top of the shaft. I know it is not ideal but can the heli be flown with this much runout. I will wait if I have to but I would like to fly it. Just getting anxious. I sent an E-mail to Synergy, but I know they are out of town at the present time. Thanks
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09-09-2006 07:34 PM  14 years ago
thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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I would not . That is way to much!
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09-09-2006 08:33 PM  14 years ago
NOLONGERFLYING

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Scottsdale, AZ

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alot
That is alot...I had the same problem, maybe worse till someone helped me dial it in.
Team MyColdHardCash
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09-09-2006 11:18 PM  14 years ago
cdrking

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Seattle

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.010 at the top of the shaft
If .010 is what you meant then, no that's too much.

I checked mine and it was at .001

Jeff
To hover is divine, the alternative is rather PLANE.
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09-10-2006 01:36 AM  14 years ago
Spookyeng

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Yes it is 10 thousands runout. It is is kinda a bummer, so close. I have everything else built just have to get a new mainshaft.

NOLONGERFLYING, How did your help get it dialed in. I will take any advice or help. I don't want to heat and bend, I would rather just wait for a new shaft.

Other than the few problems, what a great helicopter to build.
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09-10-2006 01:45 AM  14 years ago
NOLONGERFLYING

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Scottsdale, AZ

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to my understanding
To my understnading it all starts out alot lower with the collet and fan hub and only gets worse on the way up. I didn;t fix it, but there are articles on the collets and runout throughout the synergy forum that can probably explain it better than I can. The person that helped me I believe got it to .002, it took about an hour of trial and error tighening and losing and moving the colet and redoing until it was aligned or something like that, im not very mechnically inclined.. I am sure other people will ring in on this topic.
Team MyColdHardCash
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09-10-2006 02:15 AM  14 years ago
Spookyeng

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Meridian, ID USA

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I had my problems with the collets but with the robbe upper I got it to about.0005. I am now having problems with the main shaft. Take it easy.
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09-10-2006 09:12 AM  14 years ago
BPFlyer

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Wichita, KS

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Contact Synergy via their website, they had my replacement main shaft drop shipped from Hong Kong and in my hand in (4) days. Great customer service!

Why would you want to fly with anything less than a true main shaft? The vibrations would be huge!
Fly it like you stole it!
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09-10-2006 11:48 AM  14 years ago
JoeHeli

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Hey Spookyeng,
What was the part number for that Robbe Collet that worked on your bird?
Thanks
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09-10-2006 01:07 PM  14 years ago
Spookyeng

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Joe Heli
The part number for the upper collet was S3176 from Rick's.
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09-11-2006 01:00 AM  14 years ago
JoeHeli

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Thanks Is it a simple fix/Replacment for the stock Collet?
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09-11-2006 01:13 AM  14 years ago
Droid

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Deep down in the Southwest- UK

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So what the main shaft runs through the fan hub now?

Clarify the post is this a main shaft issue or is this the fan hub /collet issue?

I'm sure it read MAIN SHAFT RUNOUT
but then i'm the only one here with sloppy balls
Quotes may have been changed for my own amusement
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09-11-2006 12:44 PM  14 years ago
Spookyeng

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Droid, It is MAIN SHAFT RUNOUT!

There was some confusion, not a big deal!
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09-12-2006 06:29 AM  14 years ago
hansking12

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irvine, ca

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have you tried to straighten your mainshaft?
that way, when you do get the replacement one, you would have an extra.

i found myself with a bent mainshaft after my crash, however, there were none to be found. straightened it to within .002 and it flies fine.

hope you get into the air soon spooky.

hans
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09-12-2006 09:35 AM  14 years ago
Droid

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Great you've just answered everything i wanted to know hans.

We got a guy like you at our field.

I would have thought with your academic background that straightening main shafts was a big no no

Hmm..... Stress raisers
Quotes may have been changed for my own amusement
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09-12-2006 02:46 PM  14 years ago
hansking12

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irvine, ca

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hardened shaft manufacturing
actually droid, i haven't begun to answer. typically, when hollow (or solid) shafts are manufactured, they have a tolerance which can effectively be reduced through mechanical straightening. now, hold on to your hat, because when these aforementioned shafts are put through heat treat (or mechanical means--but i doubt it) to harden them through typically martensitic transformation, they come out-----bent!!! so then, they are mechanically straightened again, prior to shipment.

of course, if there is a kink or something more than a slight bend, the grain structure would be significantly compromised upon forcibly bending it back beyond the elastic region. i would not try and straighten a kinked or significantly bent shaft.

droid, if you want to talk about stress risers, please pm me and we can start a whole new discussion on the concentration of stress along the main shaft and across various cross sections of it before, during and after manufacture, whilst installed, and whilst running. perhaps you could use that knowledge of yours to come up with a nice finite element analysis using the sw of your choice whilst not assuming constant material properties throughout the main shaft due to surface hardening. or you could choose to deflect the topic and try and stir up something else which has obviously been your preferred method.

i would prefer to keep the discussion within the realm of us flying the helicopters. i would also like to keep the discussions simple and effective.

yes, i have somewhat of an academic background, however, i do not pretend to know it all and i do not exist in an academic vacuum. i'm always open to logical and open discussion and analysis. i have found through my career and life experience that those who think they know it all and are very vocal about it, often have the most to learn. i try to speak softly.

oh, and droid "You don't know me, you don't who i am or what i am." sound familiar? oh, and since you now know everything you wanted about me, how about coming clean and not hiding behind a screen name? who are you really? or are you ashamed to let everyone know who you really are? after all, someone who hides behind a screen name and asks then to be taken seriously has something to hide, wouldn't you say? i am who my screen name says i am. i populated my profile. why don't you? now i have to go and fly again.


hope this helps,

hans
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09-12-2006 03:00 PM  14 years ago
Spookyeng

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Meridian, ID USA

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hansking12,
What method would you use to get the shaft to run true? Thanks
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09-12-2006 03:41 PM  14 years ago
hansking12

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irvine, ca

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spooky
a few small aluminum v blocks and a portable press with a dial indicator would be the preferred method and the only one which i would recommend. i hesitate to mention what i used personally since i was not at my house and there wasn't a press nearby. . .i think droid would hammer me if i mentioned that i used a sledge hammer (use a softer material to pad/distribute the force or you might get the localized stress risers which droid rightfully spoke of--hence the aluminum v block)

hans
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09-12-2006 07:56 PM  14 years ago
steve9534

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yakima, wa.

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Main shafts
I've been straightening main shafts for 15 years and have yet to have one fail or even hear of one failing. In a crash, they typically will bend at the upper bearing block. I drilled a hole in my solid core door work bench to the depth that corresponds to that point on the shaft, then stick the shaft in the hole and bend it straight with a pipe or a large wrench. To check the alignment I clamp my dial indicator shaft to the side frame and put the main shaft back in the heli. Obviously a badly bent shaft needs to be replaced, but one that's bent .010" can be easily straightened this way. steve.
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