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HelicopterMain Discussion › Tool to check main shaft
04-08-2015 05:39 PM  35 months agoPost 21
Heli_Splatter

rrElite Veteran

USA

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Well, have you ever heard of collets?

If you are a machinist, you can get a shaft chucked up in the jaws correctly/accurately. Realize here, the best(least expensive) choice is the glass rolling, the shaft protrusion in this case precludes that, so there are other options. The other options are more expensive and time consuming. I only pointed out the lathe because some might have a friend who could help out.

A $40 shaft for some is throw away, for others not so much. The comment on the duty cycles of the shaft is well taken. The shaft is not a static, live forever piece of equipment. When in doubt, throw it out. There are manufacturing flaws in new merchandise sometimes.

I have even gone to measuring the vibrations of the equipment to see if it is better or worse after making a change. The lower the vibrations, the better all around. You bet...

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04-08-2015 09:17 PM  35 months agoPost 22
AirWolfRC

rrProfessor

42½ N, 83½ W

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Here's mine,

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04-08-2015 09:49 PM  35 months agoPost 23
Cobra 46

rrKey Veteran

Cambridge il usa

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So far + 3 for Tyler 😃

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04-08-2015 10:20 PM  35 months agoPost 24
TMoore

rrMaster

Cookeville, TN

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All you need to check shafting for our helis is a small drill press, a .0005" indicator with suitable holder and a couple of v blocks. Shars.com is the place to go.

Delayed Response Operator Not Engaged

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04-08-2015 10:38 PM  35 months agoPost 25
tvoth

rrNovice

Albuquerque

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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.
Oh cool! An excuse for a lathe!

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04-08-2015 11:06 PM  35 months agoPost 26
R.J.

rrVeteran

SF bay area, CA USA

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Well, have you ever heard of collets?

If you are a machinist, you can get a shaft chucked up in the jaws correctly/accurately.
Yes, I have 5C collets for my lathe, and I would know how to get a shaft centered in a scroll chuck, and I'm not a machinist. But if the OP was a machinist, it's unlikely he would be asking how to check if his mainshaft was straight.

I just didn't think it was reasonable to tell someone to go out and buy a lathe that costs more than his helicopter just to check if his shaft is straight. Granted, I think it's great for everyone to have a lathe, but it still wouldn't be my primary tool to check a shaft.

I think the OP has probably already bought a new mainshaft.

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04-08-2015 11:24 PM  35 months agoPost 27
Heli_Splatter

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USA

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Yeah, the lathe is not a first choice. I did say that with a smiley face. One size does not fit all.

If you happen to own a lathe, it is perhaps the best choice. You can always over-tool any problem.

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04-09-2015 12:06 AM  35 months agoPost 28
Jerry K

rrKey Veteran

Houston Area

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Pick up a couple of spare main shaft bearing and slip them over the ends of the main shaft, and spin it with the bearings laying on a table. IF you have a good eye you will see if it is truely bent. (with the naked eye)

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04-09-2015 02:27 AM  35 months agoPost 29
Vaderluck

rrApprentice

Melbourne - Australia

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Pick up a couple of spare main shaft bearing and slip them over the ends of the main shaft, and spin it with the bearings laying on a table. IF you have a good eye you will see if it is truely bent. (with the naked eye)
This is excellent idea ... why didn't I think of that

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04-09-2015 03:06 PM  35 months agoPost 30
basmntdweller

rrKey Veteran

Indianapolis IN

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How about three pieces of glass? Two pieces on top of the third with a gap between them for the stop ring.


Stupid people have no idea how stupid they are!!!

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HelicopterMain Discussion › Tool to check main shaft
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