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Bending ply in 2 dimensions (#4396)
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rolandw  
#1 Posted : Tuesday, June 19, 2012 3:57:37 PM(UTC)
rolandw

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I have to model some bent ply as a seat shell. Obviously thin enough ply can be bent in a number of ways but can't form a compound bend. So far I have managed to create my ply form and bend it around a path so I have the right form along the centreline of the seat shell. However I now need to curve the back and put dips for the thighs into the seat. Is there an obvious way of bending a section without introducing compound bends or calculating the sections to skin?
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rolandw  
#2 Posted : Thursday, June 21, 2012 3:06:47 PM(UTC)
rolandw

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I've made a mockup of what I'm trying to achieve so I've attached an image. You can see the form bent in one plane and the red lines showing what I'm try to get to. No ideas at all?
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seatback.jpg (24kb) downloaded 5 time(s).

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rockyroad_us  
#3 Posted : Thursday, June 21, 2012 4:23:48 PM(UTC)
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It takes time to learn what you are trying to do. I sure can do it.
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zumer  
#4 Posted : Thursday, June 21, 2012 5:22:20 PM(UTC)
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It can't be done without compound curvature.
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lgrijalva  
#5 Posted : Thursday, June 21, 2012 5:54:55 PM(UTC)
lgrijalva

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Assuming that the image below meet what you want approach, then you need to do a few steps:

1.- make your trace for a desired shape to make a net surface

[ATTACH]4448[/ATTACH]

2.- make net surface [ATTACH]4452[/ATTACH] and then thicken solid surface tool[ATTACH]4450[/ATTACH]

[ATTACH]4449[/ATTACH]

thats it, you can add more curves (prior to make the net surface) to your net surface for better control of your surface shape.

[ATTACH]4451[/ATTACH]

Hope this help

Luis G.
lgrijalva attached the following image(s):
chairtrace.png (33kb) downloaded 5 time(s).
chair.png (131kb) downloaded 5 time(s).
thickentool.png (27kb) downloaded 5 time(s).
extraline.png (183kb) downloaded 5 time(s).
netsuftool.png (16kb) downloaded 5 time(s).

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Luis G
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phil  
#6 Posted : Thursday, June 21, 2012 6:33:25 PM(UTC)
phil

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That's an awesome tutorial/steps and help from Luis on how to do it!

I think i sat on a similar type of contoured chair before and it was uncomfortable. The middle bulge will get in the way of guys' body part:) Maybe add an extra line nearer to the front edge so that more of the seating surface is flat. Also there are some of us guys with lousy posture... we can sit up straight/correctly for the first 10 minutes only. After that we start sliding forward and the bulge at the front will get in the way again. Anyways... silly me here:)
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