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  #121  
Old 05-12-2019, 10:23 PM
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neilb neilb is offline
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looking at the paper pattern on the buck, you have it laid down apart from the middle where you have extra paper, that would need to be shrunk to loose the excess. do you want it with a swage through centre but still concave?
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  #122  
Old 05-12-2019, 11:56 PM
skintkarter skintkarter is offline
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Thanks guys. Here a is fairly decent picture of the end result. Think of a truck snowplough blade at a lower angle of attack - two concave planes in a slight vee, meeting with a ridge in the middle.

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  #123  
Old 05-13-2019, 06:33 PM
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neilb neilb is offline
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the swage in the centre should be easy enough with a tipping die and a skateboard wheel, or done in the wheel.

did you try to tip the flanges along its length to see what happens?

tipping the edges will change the length of the part, after that I am also out of talent
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  #124  
Old 05-13-2019, 09:51 PM
skintkarter skintkarter is offline
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Quote:
Originally Posted by neilb View Post
the swage in the centre should be easy enough with a tipping die and a skateboard wheel, or done in the wheel.

did you try to tip the flanges along its length to see what happens?

tipping the edges will change the length of the part, after that I am also out of talent
Thanks Neil - makes sense. I'm just rebuilding a bit of confidence by flanging the corner pieces and have to actually work tonight, so with a bit luck I'll get time to cut another blank tomorrow and have a bash. Probably should make a more durable template, as It might take a few goes here Thanks again for taking the time to guide me.
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  #125  
Old 05-13-2019, 09:55 PM
skintkarter skintkarter is offline
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Quote:
Originally Posted by Jack 1957 View Post
Richard, I'm not sure I completely understand what you're trying to do but from the picture with the sheet laying on the buck, I think you are trying to make what would look like a lang section of a tube but you ended up with a concave bowl. If that's the case, you don't want to stretch the middle, you want to stretch along the edges lengthwise. More material along the edges will make the sheet lay down. Stretching in the middle will just make a deeper bowl.
You said you might have ruined the first attemp, so test this method on that sheet. You'll see what I mean.
Thanks Jack.
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  #126  
Old 05-19-2019, 04:30 AM
skintkarter skintkarter is offline
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Default For Sale - Sheetmetal shop and part finished BMW racecar

Ummm - reverse curves. Never done one before and this just about did my head in, even with an ubermetalshaper mate calling in to try and bail me out. Had 4 goes at this bit and now understand 3 ways which conclusively don't work!

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Attempt #4 - near enough
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Attempts 1, 2 and 3
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Ubermetalshaper mate Mike Roberts trying to save attempt #1
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Centre panelbreak done
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Setup for panel break - thanks Neil B
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Setup for tipping the top flange
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  #127  
Old 05-19-2019, 05:11 AM
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Gojeep Gojeep is offline
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Getting there in the end is all that matters. Looks like you have it sorted.
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