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HelicopterMain Discussion › Tool to check main shaft
04-08-2015 05:41 AM  34 months agoPost 1
Vaderluck

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Melbourne - Australia

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Is there any tool available to check main shaft is bent or not ?
Some main shafts have a stop notch (not sure it is the right word) in the middle so it is impossible to check them by rolling on a glass.

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04-08-2015 05:51 AM  34 months agoPost 2
Al Austria

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Gainesville, FL

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Dial indicator

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04-08-2015 06:24 AM  34 months agoPost 3
johnbs8

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roseville michigan

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dial indicator is a for sure thing. i use a high speed drill gun. you can see if its running true or not.

also, with servos powered, spin your blades by hand and look at the swash, if its moving in a circular motion its bent.

TT X50 Nitro
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04-08-2015 07:11 AM  34 months agoPost 4
JEEPWORLD2002/2

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Blue Bell, Pa

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Also one could use1/4 sheet metal with a slot routed or milled out for the ridge or two piece of metal on a flat surface spread apart to form a gap for ridge. I assuming ur talking about a goblin main shaft ?? Also you could use a blade balancer wheel spinny thing to sping the shaft on. I think there was another thing qww made with two main bearings and u slid the shaft threw n spun it would also mount a dial indicator for true measurement but unless u have one or can find one for sale that's probally not a option unfortunately

Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP

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04-08-2015 09:11 AM  34 months agoPost 5
R.J.

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SF bay area, CA USA

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Two "V" blocks and a dial test indicator, magnetic base, and something flat and ferrous to put it on.

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04-08-2015 11:13 AM  34 months agoPost 6
IYKIST

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London united kingdom

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You can also use a very flat surface mirror and roll the shaft on it, if it is bent you would see it.

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04-08-2015 11:23 AM  34 months agoPost 7
Retired2011

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Lee's Summit, MO

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Read more carefully!
Some main shafts have a stop notch (not sure it is the right word) in the middle so it is impossible to check them by rolling on a glass.

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04-08-2015 11:28 AM  34 months agoPost 8
IYKIST

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London united kingdom

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oh, i missed that. thank you

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04-08-2015 11:33 AM  34 months agoPost 9
Retired2011

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Lee's Summit, MO

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Sorry, couldn't resist...feeling a little evil this morning!

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04-08-2015 01:33 PM  34 months agoPost 10
Tyler

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Chicagoland area

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Although not a direct answer to the question...
Unless working on a obsolete machine, I live by the "when in doubt, replace any suspect shaft or spindle" motto. For minimal expense I can ensure that every shaft and spindle is new and true. Saves time, tooling, and frustration with minimal expense.

My machines all fly better and last longer due to reduced vibrations since I began this practice.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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04-08-2015 02:45 PM  34 months agoPost 11
Heli_Splatter

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USA

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Chuck it up in your lathe and set the cutting tool close by, you will see the variation at any point on the shaft.

Don't have a lathe... get one..

My departed mentor, never understood how anyone could function without a lathe in the house. RIP Roland. You taught me a lot.

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04-08-2015 02:48 PM  34 months agoPost 12
ssmith512

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Indianapolis, IN USA

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Tool to check main shaft
I use the wife.

Steve

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04-08-2015 02:57 PM  34 months agoPost 13
Cobra 46

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Cambridge il usa

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I agree with Tyler
Just replace it if in doubt ! It's cheeper than any machine you would have to purchase. Unless u have the machine already but then you wouldn't have asked !

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04-08-2015 03:00 PM  34 months agoPost 14
Wave

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Illinois

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I check mainshafts by throwing them in the garbage.

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04-08-2015 03:36 PM  34 months agoPost 15
Aaron29

rrProfessor

USA

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check mainshafts by throwing them in the garbage
Maybe on an Align. Not always an option on the high dollar birds. $40 mainshafts are worth checking.

But in all this. I forgot to ask WHY we're checking the mainshaft? Is it a crash? Is it used? Sometimes it's best to start with a new one. Metal fatigue is a thing, and can cause a part to fail. Even a straight one.

A tailhub or spindle, and their associated bolts, I replace once in a while. At 2000 RPM on the head, and 8000 or so on the tail, it doesn't take long to rack up MILLIONS of stress cycles a year. Add a crash or two to that, where a part was stressed just below the elastic limit, and so it's straight and reused, and you might get to see structural failure at some point.

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04-08-2015 03:40 PM  34 months agoPost 16
Tyler

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Chicagoland area

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Owning a bird with a $40 shaft is not for the weak of finances. That sounds boutique like, in such case the owner should buy two lathes for this hobby.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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04-08-2015 04:55 PM  34 months agoPost 17
R.J.

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SF bay area, CA USA

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I have two lathes, but if you're using a 3 jaw scroll chuck, you'll likely have some runout from the chuck itself to deal with, so I don't think I'd recommend buying a lathe as first choice.

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04-08-2015 04:56 PM  34 months agoPost 18
heliraptor10

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kokomo, in-US

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+1 for Tyler
If there's a notch on the top roll it with that part off of the edge.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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04-08-2015 05:23 PM  34 months agoPost 19
Cobra 46

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Cambridge il usa

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I think the notch or protrusion was in the center of the shaft ! You might be able to spin the shaft on a high point with the dial indicator on top of the shaft ! Maybe
In the last thread we talked about main shafts,, (broken bolt in hole)The guy said his was $80 but never told us what brand !
Good lesson here !!
know what your parts might cost !!

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04-08-2015 05:29 PM  34 months agoPost 20
heliraptor10

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kokomo, in-US

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Oops I read top notch not stop notch..
Yeah....so +1 for Tyler

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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HelicopterMain Discussion › Tool to check main shaft
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