Hi,
I'm finishing to build my SIG Somethin' extra and the manual tells me to solder the brass coupler onto one end of the braided throttle cable. I did it but it seems that my solder is not strong enough as it broke when I connected it to the throttle and did some tests . I used Silver solder to do it. Do you have any tips to make a strong solder. Or should I use another system to connect the servo to the throttle...
Thanks.

For throttle I have just crimped the cable to the brass piece. You may need to add more heat to the cable. Sounds like a cold solder joint. Can you try a different flux?



Dru.

Oh, you right. I didn't heat the cable: I just put the flux over it.
I'll try that.
Thanks.

You want to put solder on the cable back so it will be stiffer where it comes out of the plastic tube . Put a little flux on the cable & put it in the coupler & put your soldering iron on the coupler & heat it, add your solder where the cable go in ,you will see it flow in the coupler . It won't come out then . Good luck , MAX H.

Hi,
I just soldered it again and it looks like better and stronger now.
I'll maiden my Somethin' Extra tomorrow and I hope I won't have any problems.
Thanks guys!!!

You'll also need a relatively hot soldering gun. A 25W pencil style won't cut it. I use a 240W pirtol style for silver soldering.

Your problem maybe not enough heat to use silver solder. Why use it not needed.

Are you actually using silver solder (brazing) or is it soft solder with some silver in it? If it requires flux, it is soft solder. The solder joint should look shiny and the shape of the metals you joined should show through as if you painted it. If you have globs or a frosty appearrance, the solder didn't stick because the heat was wrong.

It's usually better to "tin" both surfaces/parts first, before joining...example..put some solder on the end of the cable and get it to wick into the strands, and get some into the hole in the coupler, then heat the two together and push the cable in.

There is a very good article on the diff types of soldering done by modelers and how-to, in last months MA mag I beleive. I learned a lot reading it.