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  #11  
Old 04-07-2020, 12:37 AM
Spraywizzard Spraywizzard is offline
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Quote:
Originally Posted by Gareth Davies View Post
If youíre going to spot weld the corner overlaps, why not just make it in 3 pieces and spot weld the ends in as it looks like a world of pain to try and make it in one piece? Every time Iíve tried to be clever and do a complex one piece folded job Iíve always kicked myself and wished Iíd gone for the simpler option with multiple pieces. One piece jobs need to be super accurate on each fold to get them all to meet as they should do and itís not easy on manual machines. Itís your choice but 3 pieces on a finger brake is going to be way quicker and easier.
I have thought about that, but this box is actually going to carry some pretty good weight for what it's going to be used for, I do not want any sway coming into effect after several years of use, the less welded joints the less stress.
There is a lid that will be closing up the opening too.
I just never posted the photo. And when the lid is flipped up it will screw down to the top of the box to hold a spotting scope.
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  #12  
Old 04-07-2020, 11:36 AM
crystallographic crystallographic is offline
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Well then, since you have made a model from pattern board/chip board/poster board, can you not determine the bend requirements from bending up the pattern? Not an uncommon practical step, in the least.
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  #13  
Old 04-07-2020, 01:58 PM
bobadame bobadame is offline
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Spot welding aluminum is very tricky to do. You probably could make it in a box and pan brake as 2 U shaped pieces with one piece being the base and 2 sides and the other piece being the top, front and back. Glue it together. Or make 2 shallow pans and glue the remaining pieces in.
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  #14  
Old 04-07-2020, 05:42 PM
John Buchtenkirch John Buchtenkirch is offline
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I stand corrected. Actually you could fold up that box on a magnetic brakeÖÖ. you just need a piece of steel cut to fit in between the top and the bottom so you can fold up the 2 ends. Iíd try spot welding the aluminum on bits of scrap first, some aluminum doesnít spot weld soundly. The auto body structural glue just might be a better idea. ~ John Buchtenkirch
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  #15  
Old 04-07-2020, 06:56 PM
Spraywizzard Spraywizzard is offline
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Quote:
Originally Posted by John Buchtenkirch View Post
I stand corrected. Actually you could fold up that box on a magnetic brakeÖÖ. you just need a piece of steel cut to fit in between the top and the bottom so you can fold up the 2 ends. Iíd try spot welding the aluminum on bits of scrap first, some aluminum doesnít spot weld soundly. The auto body structural glue just might be a better idea. ~ John Buchtenkirch
The Steel box I build will be spot welded and glued
The Aluminum boxes will be pop-riveted and glued

Thanks everyone for your ideas .
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  #16  
Old 04-07-2020, 07:35 PM
crystallographic crystallographic is offline
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For aluminum box - once cut, deburred, folded up and fit, drilled and pinned -
I'd definitely-no question-100% go for "bonded structure."
Devcon makes a good line of glooos.
(Using aviation sealant "ProSeal" is good enuf for 747's ....)
Rivet wet. w/Closed end stainless rivets. Good ones! NOT McMaCaramba.

I would employ the "water break" test after cleaning and before bonding.

I suspect that dynamic loads are not a feature of your ballistic usage, but torsional, compressive, and tensile would be.
"Light and strong"
Handle?
Strap?
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Last edited by crystallographic; 04-07-2020 at 07:39 PM.
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  #17  
Old 04-08-2020, 12:01 AM
Spraywizzard Spraywizzard is offline
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Quote:
Originally Posted by crystallographic View Post
For aluminum box - once cut, deburred, folded up and fit, drilled and pinned -
I'd definitely-no question-100% go for "bonded structure."
Devcon makes a good line of glooos.
(Using aviation sealant "ProSeal" is good enuf for 747's ....)
Rivet wet. w/Closed end stainless rivets. Good ones! NOT McMaCaramba.

I would employ the "water break" test after cleaning and before bonding.

I suspect that dynamic loads are not a feature of your ballistic usage, but torsional, compressive, and tensile would be.
"Light and strong"
Handle?
Strap?
Both , Handle and strap will be used in the design
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