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HelicopterMain Discussion › looking for a little die to thread linkage rods.
11-29-2007 10:29 PM  9 years agoPost 21
steve9534

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yakima, wa.

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Chris

I'm not sure what brand of rods you are using, but the MA, TT, Hirobo, and Align rods I've had were all mild steel. The 4-40 is larger and should be stronger. If you want something that looks stock, TT sells packages of link rods for relatively cheap. Generally one or the other of the rods in the pack will fit or can be cut to fit most other helis. steve.

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11-29-2007 10:33 PM  9 years agoPost 22
airdodger

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Johnston USA

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The MA rods are case hard take a die to them and see how long it lasts. I agree the 4/40 is larger but all thread is just asking for trouble, and by no means bend the all thread rod and then use them. For what he is going to do with them he could use spaghetti and be ok but other people will read this and be doing hard 3D and get in trouble.

Chris

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11-29-2007 10:35 PM  9 years agoPost 23
The Old Guy

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UK Surrey

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I used soft bicycle spokes (not stainless) to hard, but the dull ones are slightly softer and are 2mm and can be cut easily with a good 2mm die.

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11-29-2007 10:42 PM  9 years agoPost 24
airdodger

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Johnston USA

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I will check the deflection tomorrow hanging a weight from both and get back to you, but that is just one measurement of strength, there is also vibration resistance and stiffness.

Chris

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11-29-2007 10:50 PM  9 years agoPost 25
steve9534

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yakima, wa.

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Chris

I've pretzeled more of the MA links than most folks will see in a lifetime. I've tried to thread them, but the threads are rolled and cutting threads with a die gives an incomplete and unacceptable thread because the unthreaded section of the rod is smaller than the needed size, not because the die wouldn't cut them. I would agree that bending the all thread is asking for trouble as the threads are stress risers and one risks fracturing the rods at the bend. I've used straight sections of 4-40 rod on 90 size helis w/o a problem. If I'm making a rod longer than 3" or so, I'll epoxy a section of CF rod over it to reinforce it. The t/r pushrods on my last 10+ helis have been made using CF rods with 4-40 rods JB welded at the ends. steve.

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11-29-2007 10:57 PM  9 years agoPost 26
Frank Bostwick

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Cincinnati Ohio

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Cope, you ask some good questions

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11-29-2007 11:36 PM  9 years agoPost 27
airdodger

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Johnston USA

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Steve That is good info putting carbon rods on any sections 3in or longer. I did not say the die would not cut them I said it would dull the die quickly. You are correct the rod is a smaller diameter and will not make a suitable thread. I don't think we need to worry about what you do,you are an experienced flyer, it is the novice that might not take all the elements in consideration. That part about stress risers is also good info and the stress is passed usually a third of the unsuported length, another reason not to use all thread.

Chris

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11-30-2007 05:22 AM  9 years agoPost 28
Cope

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South Lake Tahoe CA

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Thanks for the input guys, and thanks for the complement Fboss!

Don't worry I ask my share of stupid one as well.
Thanks Guys
Cope

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12-01-2007 03:23 AM  9 years agoPost 29
airdodger

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Johnston USA

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I used three rods extended 4inches to center of link, a 22oz weight hung from the center of link. 2mm deflected 3/4, 4/40 all thread 9/16, 4/40 threaded an inch 7/16. I added another weight to the previous weight, the all thread had a permenant bend at that point. This is not a great test, a better test would have both ends threaded on links, compress and read the pressure required to deflect a set distance.

Chris

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