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Building Tips and technical articles. => Building techniques => Topic started by: Motorman on January 16, 2014, 08:51:50 PM
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For me NO!
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I agree with Robert...
Marcus
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I agree with Robert and Marcus.
Heat would be the last thing I would want on the lifeline to my model.
Guys have been looping the loop and squeezing for years.
And that ain't the name of a dance! n~
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Never solder lead out cable-anyplace. Where the solder ends is created a hard spot in the wire which when flexed a few times causes the wire to crack at that spot. Failure is almost assured at some point. Fine wire wraps with epoxy is much better.
Dave
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Fine wire wraps with epoxy is much better.
Dave,
I never heard of this?
Can you explain a bit? Photo? It would be appreciated.
Charles
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You did not specify cable or solid wire lead outs. Soldering into the rivet and wrapping the free end would make more sense with solid wire lead outs. Wrapped rod without solder is not unusual, I have an old super ringmaster that is built like that, and passes pull test with no problem. (No I did not build it like this, as I don't like rod lead outs. I am not changing it though.)
Using the pop rivet to provide a bearing surface is not a bad idea. The concept is not much different than using tubing to make a bearing.
http://www.stunthanger.com/tips.htm
I used a pop rivet as a bearing on the elevator of the above mentioned Super ringmaster which has a (worn) wood horn. I also use pop rivets as lead out guides since it is quick, easy, and works well. (knock the nail out of the rivet to leave an uncrimped sleeve)
People have been wrapping and soldering cable for years too because it works well (it is recommended in the '12-'13 rule book). I do not solder lead outs anymore as crimps are faster and arguably better. People have also been wrapping, then heat shrink instead of solder, which eliminates some problems related to filling cable with solder causing a "hard spot" (with related potential fatigue problems from all the wires in the cable soldered together), and temper change of the cable from heating.
I can see a clear advantage of having effectively no "tail" "wraps" or "crimp" to hang up on ribs and such (I have destroyed a plane over that alone, almost destroyed a second, and know better now) I now prefer a opened up rib opening and making the connection in a similar manner as linked, as short as possible (I use crimps now).
I would be unwilling to rely on only a solder joint for a lead out.
Phil
Stirring the pot with my opinion: Using a liquid adhesive such as epoxy or CA may also create a hard spot, similar to soldering, by wicking into the wire. It will prevent temper changes at least. If the glue is thick enough to not wick through the layers there should be little difference between shrink tube and glue.
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If you will do a test, all of you on this forum. When is the cable flexed when we use it while flying a plane. I find I am flexing it at the place where I swage the tubing I use. Even at the bell crank if the flexing of the cable is because of the amount of bell crank movement, you have not done the connection right. Check out Tom Morris' bell crank set up some time. When I do my connections, I make sure that the cable does not flex at the tubing when the bell crank is moved the max amount when mounted. Same goes for the terminations on the ends of our lines and the cable on the handles. The last time I had a flying line that needed to be redone because of broken strands, I was still using wraps with fine copper wire and no solder or epoxy. If you ever learned how to mend shirts or show on buttons, you know how to terminate the wrap of the wire so it doesn't come un done. But, know matter how you do the terminations, be sure and check it time you use the lines. H^^
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Stirring the pot with my opinion: Using a liquid adhesive such as epoxy or CA may also create a hard spot, similar to soldering, by wicking into the wire.
I would expect that glue wicking up a wire would not harden the wire enough to cause a problem. Wire + glue is a lot more flexible than wire + solder.
I would also expect that any flux that's aggressive enough to let you get a decent solder joint on stainless would also be pretty corrosive afterwards, and possibly difficult to clean off.
Gluing up your assembly to such a degree that it's a big blob, with a wire exiting it, would make a stress riser. I don't think that's how most of us do the job, though
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Dave,
I never heard of this?
Can you explain a bit? Photo? It would be appreciated.
Charles
Charles I believe I demonstrated this way back in my build thread. Scan back through there.
Dave