slopecombat
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| posted on 3/2/07 at 01:57 AM |
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"bending" tube ...
25x25x2mm
Easy !
Modesto
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panichat
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| posted on 3/2/07 at 01:14 PM |
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Could I ....?
Is there a good reason why I couldn't do something similar with the upper round section tube? - I think I could make it much neater than with my
useless bending. If the roll bar supports go to the lower rear corners instead of the upper bar there wouldn't be any chassis strength issues to
worry about would there?
Cheers
Dave
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James
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| posted on 3/2/07 at 04:03 PM |
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I did something similar to get the bend in one of my exhaust tubes.
Except I did about 30 cuts and to keep them narrow enough... by hacksaw! 
Cheers,
James
------------------------------------------------------------------------------------------------------------
"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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andyps
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| posted on 3/2/07 at 05:24 PM |
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The only problem I can see with doing it this way is getting the panel neat on the square section - without any experience I would imagine it would be
much harder to make it look neat on square section than round (assuming you are using ali rather than grp).
Andy
An expert is someone who knows more and more about less and less
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DIY Si
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| posted on 3/2/07 at 06:23 PM |
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There's no problem strength wise doing it, as Indy's don't even have a top tube at all! As said, it may cause a slight issue getting
the bottom of the back panel to sit right, but only if you're using ally.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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kb58
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| posted on 3/2/07 at 07:36 PM |
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I used that method for "bending" my dash tube. What happens is the shrinkage from the multiple welds can result in a very differnent shape
than what you started with!
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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slopecombat
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| posted on 4/2/07 at 12:24 AM |
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Upper corner in progress ...
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kb58
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| posted on 4/2/07 at 02:10 AM |
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You left out the most important step... welding it. When you weld it, that 90 degree shape will absolutely change, even if you alternate sides.
It can work, but don't expect it to stay at its initial angle! After welding all the cuts, you'll have to add another cut to put the angle
back where it started.
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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Dick Bear
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| posted on 4/2/07 at 04:51 AM |
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You should have no movement or distortion if you spot-tack all cuts first and as you bead weld skip around (top, back, one end then the other etc.)
never letting any one area get too hot. Short beads and move around the entire part.
On a small piece you may also want to clamp it to another straight channel until you get the spot tacks in place. It is important to weld straight on
through the tacks as if they don't exist.
Dick Bear
www.marketpointproductions.com
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gottabedone
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| posted on 4/2/07 at 09:54 AM |
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If you make a template/former for the outside of the curve (3/4 MDF or ply) and clamp from top to bottom, you could then spot the joins on the inside
of the curve, adjust where necessary, spot the top, adjust again before it is too rigid. You should be able to minimise the distortion and keep your
finished curves the same. Be careful when you attach you panels to these curves because if there are large gaps between the back of the panel and box
section it will create stress raising areas and my eventually crack the panel or pop your rivets.
regards
Steve
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slopecombat
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| posted on 4/2/07 at 05:16 PM |
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Welded ...
I'll take pictures of the hole process in the last corner.
Modesto
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panichat
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| posted on 4/2/07 at 06:43 PM |
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Looks good
OK, I'm inspired!
This is my next job on the car so here goes...
Cheers
Dave
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slopecombat
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| posted on 11/2/07 at 03:09 PM |
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Pictures of the process
Here you are :
cheers,
Modesto
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John Bonnett
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| posted on 11/2/07 at 04:18 PM |
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This has been mentioned before but just to repeat, square tube (as well as round tube) can be bent very nicely cold using a bending beam.
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John Bonnett
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| posted on 11/2/07 at 04:21 PM |
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Sorry forgot the pic.jpg)
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