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  #51  
Old 10-06-2016, 04:35 AM
hot rivet hot rivet is offline
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Couldn't you use an undersized punch "capped" with an initial draw, correct any imperfections in the surface and use it to form all the final parts rather like stretch presses use to protect kirksite dies?
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  #52  
Old 10-08-2016, 03:54 PM
Futterama Futterama is offline
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Quote:
Originally Posted by hot rivet View Post
Couldn't you use an undersized punch "capped" with an initial draw, correct any imperfections in the surface and use it to form all the final parts rather like stretch presses use to protect kirksite dies?
You need to use layman words because I didn't get 60% of that

First sphere is finished and silver soldered to the stainless steel corrugated tubes that it should connect.

If any silver solder experts are reading this thread, I could use some advice on how much flux to use. I don't know if I use too much or maybe using too much heat, but the flux residues turned black and needed sanding before it would let go of the metal.

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  #53  
Old 10-08-2016, 04:11 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by Futterama View Post
You need to use layman words because I didn't get 60% of that

First sphere is finished and silver soldered to the stainless steel corrugated tubes that it should connect.

If any silver solder experts are reading this thread, I could use some advice on how much flux to use. I don't know if I use too much or maybe using too much heat, but the flux residues turned black and needed sanding before it would let go of the metal.

Attachment 39047
Attachment 39048
Attachment 39049
Attachment 39050
Attachment 39051
Nice parts.
Steam / boiling water should loosen the flux "glass."
Flux residues vary with the type and heat-range (high temp, med. temp, low temp) of the brazing flux.

Low-temp brazing fluxes are used with 45-56%Ag silver-brazes, leave a white residue, and with active ranges of 950F -1250F / 510C - 675C
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Last edited by crystallographic; 10-09-2016 at 01:16 AM.
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  #54  
Old 10-09-2016, 07:52 AM
AllyBill AllyBill is offline
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Looks really neat - but what is it?

Will
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  #55  
Old 10-09-2016, 08:34 AM
Futterama Futterama is offline
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Originally Posted by AllyBill View Post
Looks really neat - but what is it?

Will
Replacement for the orange 3D printed sphere. It's a propane-driven sound cannon for RC planes. It's hard to get on video, but the shots are so loud you need ear protection when you are within 5 meters of the sound cannon. It needs to be louder than the gas engine on the plane.

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