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 what link material?

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Rockn93YJ
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PostSubject: Re: what link material?   Wed Oct 21, 2009 2:55 pm

MonsterS10 wrote:
bill i think that the best thing would be Alumi lowers & dom uppers & try to make all lowers & uppers same length front & rear that way u only need 1 spare upper & lower to save cost


Do you have the equipment to drill and tap solid aluminum to build these links?

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MonsterS10
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PostSubject: Re: what link material?   Wed Oct 21, 2009 3:44 pm

can do i'll get price on materials also might be cheaper
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Rockn93YJ
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PostSubject: Re: what link material?   Wed Oct 21, 2009 3:49 pm

Thanks that would be greatly appreciated. I have all the Joints from Randy. using 1" on the uppers and 1 1/4 on the lowers.
2" for the lowers and can do DOM for the uppers as you suggested. Guessing .250 should be fine with 1.75 OD.

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PostSubject: Re: what link material?   Wed Oct 21, 2009 8:46 pm

My links are all 7075 Alum... using 2" for the lowers, and 1.75" for the uppers.. Joints are the Currie forged Johnny Joints with a 1" shank on the uppers and 1.25" shank lowers.

I went with Aluminum because:

1: It's significantly stronger than 2" .500" DOM
----- 2" 7075 AL link in my length takes 6800lbs to bend permanently, weighs 11lbs.
----- 2" .250" DOM link in my length takes 3200lbs to bend permanently, weighs 13lbs.
----- 2" .500" DOM link in my length takes 4350lbs to bend permanently, weighs 22.5lbs.
----- 2" .250" 4130 CroMo link in my length takes 4000lbs to bend permanently, weighs 11lbs.
----- 2" .500" 4130 CroMo link in my length takes 5500lbs to bend permanently, weighs 22.5lbs.
2: I was trying to save weight where I could without sacrificing strength and longevity (How many 2-seater 4WS rockwell rigs have you seen that weigh 4600?) I saved ~80 lbs in link material alone.
3: It wasn't THAT much more in the end than DOM + inserts, and was less than 2" .500 CroMo (Which I would have drilled and tapped)
4: No weld to fail. (minor reason)

I have landed directly on the links several times (Can Opener at Harlan is a prime example) and you feel it give ever so slightly, makes the landing a little nicer. The difference is, when steel bends, it tends to stay bent. Aluminum is easier to bend, but comes right back to shape, which is why 7075 is what the landing skids on a Huey are made from...

If you get AL links, do NOT taper the ends, keeping them full diameter gives the jam nut a good surface to grab onto, and keeps the wall thickness good around the threads.

Just my $.02..

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MonsterS10
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PostSubject: Re: what link material?   Thu Oct 22, 2009 8:18 am

wow did your research on that didn't you
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PostSubject: Re: what link material?   Thu Oct 22, 2009 9:37 am

MonsterS10 wrote:
wow did your research on that didn't you


I tend to over-research things. I'm kind of a sponge for information, when it interests me. (Which is why I'm here right now instead of doing work.. ssshhhh Wink

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PostSubject: Re: what link material?   Thu Oct 22, 2009 12:11 pm

I can get 7075-T6 2" extruded T6511 round bar stock for $14.83 per foot or cold finished T651 for $21.50 per foot. We use a lot of exotic/ semi-exotic materials here at work and can get pretty good prices on it.
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PostSubject: Re: what link material?   Thu Oct 22, 2009 1:21 pm

the 1.75 7075 alum for me is 18.77 per foot
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jealos-z
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PostSubject: Re: what link material?   Thu Oct 22, 2009 1:52 pm

WOW I like My leaf springs, I can deal with the harsh ride jocolor

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PostSubject: Re: what link material?   Thu Oct 22, 2009 2:12 pm

Since the Alum comes in 12' lengths as a full stick, you might get a cost break for buying the whole length..

I think mine was the T6511, if I remember right.

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PostSubject: Re: what link material?   Thu Oct 22, 2009 4:19 pm

Thanks for the tech, I was trying to find some actual numbers. With that info I definitely want to go with the 7075 links for uppers and lowers. 2" lowers and 1.75" uppers. I'll soon be tearing into the CJ and will get back to you wtih the exact lengths and have you build them for me. I'll try to keep them all the same lengths if it happens to work out. Thanks to all for looking into this for me.

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