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HomeAircraftHelicopterHelicopter Main Discussion › Long 10mm Main shaft
10-15-2005 10:43 PM  13 years agoPost 1
Zach Sparks

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Norton Shores, MI

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I'm looking for a long 10mm main shaft. So far the longest I have is:

Hirobo: 220mm or just over 8-5/8 inches.

I really don't care if I get inch or mm measurement so if you have a long one please post the length That sounded bad didn't it.

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10-15-2005 10:54 PM  13 years agoPost 2
Phil_Mart

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Newcastle UK

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Check out the Vario part number 35/21, its a 10mm x 302mm rotor shaft.


Philip Martin.

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10-15-2005 10:57 PM  13 years agoPost 3
Zach Sparks

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Norton Shores, MI

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That is a long one.
Gotta check the price of it next. VARIO----sounds $$$$.

Thanks

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10-15-2005 11:07 PM  13 years agoPost 4
Zach Sparks

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Norton Shores, MI

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Whew---$50 for that sucker. It is long but I might need a few of them for the project I am working on. The hirobo shaft is more reasonable for what I am looking for at $11. I was hoping to find a long inexpensive shaft since I may need a few of them.

I may just end up buying a length of 10mm rod but I would prefer to just get the shaft and be done with it----no cutting/drilling. Also looking for shaft that does not change diameter at the ends.

Thanks

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10-15-2005 11:15 PM  13 years agoPost 5
AirWolfRC

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Look at J&L Industrial. 36" long drill rod, 10mm $7.00

Wolfgang

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10-16-2005 12:36 AM  13 years agoPost 6
Zach Sparks

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Norton Shores, MI

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Thanks---I was just digging into the internet for metal rod.

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10-16-2005 12:51 AM  13 years agoPost 7
Peefor

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Norfolk UK

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A 36" length of silver steel may suit your purposes. It's usually pretty good quality.

Pete

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10-16-2005 01:25 AM  13 years agoPost 8
Zach Sparks

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Norton Shores, MI

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Looking for strong but lightweight. Any other ideas on 10mm. Main shafts are a bit heavy but will work. Prefer something lighter.

Ideas?

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10-16-2005 03:10 AM  13 years agoPost 9
Al Magaloff

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10mm titanium shafts?

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10-16-2005 03:56 AM  13 years agoPost 10
AirWolfRC

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So now you want to get picky, hu ? That'll cost you. Try heavy wall tubing, maybe a 2.5mm wall but that will only save 25% of the weight. Anything better than that and you need to bring your check book and / or start redesigning.

Wolfgang

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10-16-2005 06:23 PM  13 years agoPost 11
AirWolfRC

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Just one more note, keep it simple.
A 10" solid steel shaft 10mm dia. is just 4.5 oz.

Wolfgang

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10-16-2005 06:57 PM  13 years agoPost 12
Zach Sparks

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Norton Shores, MI

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Keeping it simple is exactly why I was planning on just using a 10mm main shaft. I am trying to do the entire project out of stuff already made so I don't have time into cutting and hacking.

I asked about alternate ideas only because 1/4 pound is a lot of weight for the part and I am trying to be weight concious of the whole thing.

I have been looking for 10mm delrin rod but haven't found it yet. I have found delrin rod but not in metric.

Still looking around. And yes----I am being a little picky. I usually get the exact outcome I am searching for this way.

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10-16-2005 07:15 PM  13 years agoPost 13
AirWolfRC

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If it's a drive shaft you're contemplating, delrin would not be a good choice. Sounds like you're not using that much power through that shaft if you're thinking delrin. If that's the case, a thin wall tube would be a better choice.

It's difficult to offer help without any criteria. It would be a lot easier (for you) if you would let the cat out of the bag.

Wolfgang

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10-16-2005 07:30 PM  13 years agoPost 14
Zach Sparks

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Norton Shores, MI

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Not a drive shaft
I need about a 10 inch piece of rod/tubing that will be supported at each end of the rod and it will support about 3 pounds of weight within the rod. The weight will be separated by two points approximately 3 inches apart. No sliding just supporting weight but I want the rod rigid and unable to flex.

As you can likely tell. I have no material composition background. I could easily just spend a bunch of money and order different rods but since there are so many people on this forum with different backgrounds I figured it a good place to start narrowing down what to use.

I actually considered just an aluminum rod but thought that might be prone to flexing and bending being aluminum is so soft. I guess that is why I keep resorting back to a steel mainshaft. Heavy but I know it will work. I have a mainshaft in my hand and I keep thinking --- damn there must be something lighter that is still inexpensive that would work.

Any idea how much force a 10mm aluminum rod 10 inches long would need to bend? I don't.

Thanks----yep still being picky.

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10-16-2005 07:44 PM  13 years agoPost 15
AirWolfRC

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There still a number of questions.

Will the shaft be rotating?

Does it have to be round ?

What are the cross section size limits of this support ?

You state that the rod will have supports at the ends of a 10" length.
What are you talking about "separated by two points approximately 3 inches apart" ?

No matter what you use, there WILL be some flexing.
The question is how much flexing can your application tollerate ?
0.01", 0.0001" ?

If it's just some kind of truss, why don't you use spruce?

Wolfgang

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10-16-2005 08:07 PM  13 years agoPost 16
Zach Sparks

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Norton Shores, MI

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Kind of like a clothes rod. Both ends will be supported upwards then in the middle (like two hangars) about three inches apart will be where the weight is resting. The shaft will be locked in place and will not rotate.

I realize there will be some flex but the weight that is hanging will be supported by two 10 mm main shaft bearings and may move around a bit so I don't want it to stay bent if it does flex and I don't want the weight alone to cause it to flex. That is why I was asking about plain old aluminum. That would be light like I want but I question its strength. Seems to me it would flex just from the weight alone.

And I want to stick to just the two ends for supporting the rod. No middle supports on the shaft. Granted the shaft supported at both ends is not supporting a lot of weight in the middle but I do want it strong and reliable.

Bear with me here. I would not be surprised if I were overthinking the whole thing. It is my curse when I get into a project. I spend way too much time thinking before I do anything.

Usually I end up ahead but not always.---Now be nice.

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10-16-2005 08:18 PM  13 years agoPost 17
AirWolfRC

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Still not enough to really help you. There are many possibilities but not enough details to pick any of them. I can envision a total assembly (less bearings) that can weigh 1 oz total but I don't like playing guessing games.

Why don't you just spell out a complete picture of what you are trying to do ?

Wolfgang

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10-16-2005 08:18 PM  13 years agoPost 18
Zach Sparks

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Norton Shores, MI

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I am going to just take off and go to Home Depot and bend some rods. Maybe I'll come up with another thought here.

Who knows.

Thanks Wolfgang----I appreciate the patience and persistence.

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10-17-2005 12:13 AM  13 years agoPost 19
Al Magaloff

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You won't find much at Home Depot, that's 10mm.

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10-17-2005 12:35 AM  13 years agoPost 20
Zach Sparks

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Norton Shores, MI

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Yeah I know---purpose of Home Depot was to just look
But I did find a few different kinds of metal rod I got to handle. I found out one thing---a 3/8 inch piece of aluminum rod was waaaaayyy too soft. I could bend it with my hands so that is what I expected---------out of the question.

I got a few ideas through PM, but either drill rod as Wolfgang noted or just sticking to my original main shaft plan may be my best bet for now.

Anyone know what MFG's have hollow 10mm main shafts?

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