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  #11  
Old 11-09-2015, 10:56 PM
gdorn gdorn is offline
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Quote:
Originally Posted by idickers View Post
I applaud your ambition, that's a hard piece to make. Is that a BMW 2002? I had that similar piece rust out on my '02, and lucked into a parts car, where some quality time with a Sawzall resulted in a corner piece I could weld in as a replacement for my rust.
1977 E12 2.8 L-jetronic 4 speed manual
has a 83" e28 2.8 with a funny cam - screams to 6500 rpm

can drive it until I fix the rust - I also cracked the windscreen trying to get it out - thankfully I have 3 spare parts cars!

I have a 78 parts car - which if I have too could remove the panel - but I figure I might as well have a go at making one first - as the dark blue E28 is starting to show rust in the same location!


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  #12  
Old 11-09-2015, 11:03 PM
gdorn gdorn is offline
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Originally Posted by TRAMP View Post
I don't see why not. What tools do you have?
I have a - olive wood mallet, vice grips, wood stump, steel 2Lb hammer, chisels, henrob 2000 gas welder with gas, vice, 200mm long of 150UB14 ("I " beam, cordless drill and bits, hole saw kit, various files - mostly woodworking hand tools.
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  #13  
Old 11-10-2015, 01:25 AM
gdorn gdorn is offline
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Well I've had a go,- justing using pliers, clamp, piece of structural angle and universal beam.

First, I made a wood template so piece could be clamped and held whilst I bent first lip with pliers - progressively bending from edge to middle. This first bending tended to be a bit straight, so I hammered the middle and ends a fair bit on the the angle to create the curve.


With a bit of more flaming, bending then hammering (hammering on the top edge of the angle) I managed to manipulate the steel to bend along the desired line.



Using a clamp to fix the piece to the angle, I was then able to slowly bend the sheet for the 2nd lip with the piers - starting at ends and moving to the middle progressively, hammering at times to straighten out the kinks.




I did the same thing on the other side


Again clamping to a Universal beam flange, I was able to bend up the last lip - then hammered it flat(ish)


For a novice first try - not bad - need a far bit of planishing, plus I got the dimension slightly too large.

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  #14  
Old 11-10-2015, 03:32 AM
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Often ends up too large if you don't take off the material thickness with each bend depending on which direction it is going.
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  #15  
Old 11-10-2015, 10:48 AM
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Gary before you start bending the piece measure it's width and then rite down the measurement from the edge each time you make a bend. That way when the sample piece is done you can find out which of the bends has to be moved to get the desired result.

Jere
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  #16  
Old 11-11-2015, 04:07 AM
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Hi gary if you can wait to just after Christmas you can come and use my new bead roller.
cheers paul
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  #17  
Old 12-13-2015, 05:45 PM
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Originally Posted by Gojeep View Post
Often ends up too large if you don't take off the material thickness with each bend depending on which direction it is going.
Could you explain alittle more because I have a hard time with this also when I do multiple bends in a piece sometimes my pieces either come out to long or to short, understanding this and doing some practice would keep me from making as much scrap.
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  #18  
Old 12-14-2015, 08:04 AM
Marc Bourget Marc Bourget is offline
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If you read up on "bend allowances" you'll get an idea of why you're getting results different than what you expect.


With some understanding of what happens "during" a bend, it's pretty easy to "repeat" within 0.020 on a brake. Same principles apply to any forming by bend.

regards

marc
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  #19  
Old 12-14-2015, 06:13 PM
Payupv8 Payupv8 is offline
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Can I just subtract the material thickness from each bend?
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  #20  
Old 12-14-2015, 07:05 PM
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Quote:
Originally Posted by Payupv8 View Post
Could you explain alittle more because I have a hard time with this also when I do multiple bends in a piece sometimes my pieces either come out to long or to short, understanding this and doing some practice would keep me from making as much scrap.
If you look on this page of my thread I cover it here.
http://www.allmetalshaping.com/showt...=12411&page=13
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