blend is magic!! more volume for your money (#1994) - Solid Modeling

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blend is magic!! more volume for your money (#1994)

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la mouche		#1 Posted : Tuesday, January 27, 2009 10:45:36 AM(UTC)
Rank: Senior Member Joined: 3/14/2007(UTC) Posts: 757		:eek::eek::eek::eek: Hello, please see the attached files. is it normal that more than volume if the model 3d is folded? oh! CAD is maaaaagic!!! hum.. Antoine la mouche attached the following image(s): 1.jpg (111kb) downloaded 5 time(s). 2.jpg (104kb) downloaded 5 time(s). 3.jpg (110kb) downloaded 5 time(s). 4.jpg (108kb) downloaded 5 time(s). You cannot view/download attachments. Try to login or register.


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Tim Olson		#2 Posted : Tuesday, January 27, 2009 12:22:15 PM(UTC)
Rank: Senior Member Joined: 2/2/2007(UTC) Posts: 5,447 Was thanked: 499 time(s) in 353 post(s)		Hi Antoine, >>>CAD is maaaaagic!!! :) Yes, this is the correct behaviour for the tool. The interior perimeter remains the same. The exterior expands. Tim Tim Olson attached the following image(s): bend.jpg (59kb) downloaded 5 time(s). You cannot view/download attachments. Try to login or register.
		Tim Olson IMSI Design/Encore


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jdi000		#3 Posted : Tuesday, January 27, 2009 1:45:15 PM(UTC)
Rank: Administration Joined: 7/29/2007(UTC) Posts: 1,862 Thanks: 1 times Was thanked: 87 time(s) in 81 post(s)		Tim How is the perimeter command activated??? Is this the perimeter of exploded edges of the bent part? Are they individual connected or joined curves(spline)? Thanks Jason jdi000 attached the following image(s): perimeter..JPG (41kb) downloaded 5 time(s). You cannot view/download attachments. Try to login or register.
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Tim Olson		#4 Posted : Tuesday, January 27, 2009 3:05:13 PM(UTC)
Rank: Senior Member Joined: 2/2/2007(UTC) Posts: 5,447 Was thanked: 499 time(s) in 353 post(s)		>>How is the perimeter command activated??? I saw your post and added in new Verify:Perimeter command. I've had more than a few requests for that tool. Just happened to come in handy regarding Antoine post:) >>Is this the perimeter of exploded edges of the bent part? For the above image, i exploded. Will look into adding only selected edges of a solid/surface. >>Are they individual connected or joined curves(spline)? Just objects, no connection or joining required. Tim
		Tim Olson IMSI Design/Encore


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la mouche		#5 Posted : Wednesday, January 28, 2009 3:23:19 AM(UTC)
Rank: Senior Member Joined: 3/14/2007(UTC) Posts: 757		Hello, hum ...:confused: I ask my question differently. In reality, a bended sheet is not more volume, if bended .... can you explain the philosophy of Shark FX? realy CAD? or modeler volume/surface ... In this case, Shark FX is for illustrators, and not for the industrial designer... ouch!! :) If Shark FX is a realy CAD program, i think you should resolve this (problem), right? Thanks Tim and Co, for your best work! Antoine


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Tim Olson		#6 Posted : Wednesday, January 28, 2009 11:03:24 AM(UTC)
Rank: Senior Member Joined: 2/2/2007(UTC) Posts: 5,447 Was thanked: 499 time(s) in 353 post(s)		>>In reality, a bended sheet is not more volume, if bended .... The bending tool adds volume. The amount it adds is a function of the bend angle and radius. Note in the image I attached the outside radius is larger then the inside radius by the material thickness. Consider this the stretched or expanded region. Keep in mind the bend tool is a mathematical model of bending where the bend region maintains constant thickness. Actual physical bending generally involve complex deformations (compression and expansion) based on the material. >>realy CAD? >> >>or >> >>modeler volume/surface ... Shark is a precision CAD application suitable for interfacing with CAM or CAE. Key to the precision aspect is the use of ACIS which is an industry standard geometry kernel for CAD as well as CAM/CAE applications. ACIS provides a kernel that integrates wireframe model, surface, and solid modeling functionality with both manifold and non-manifold topology. For more info... http://en.wikipedia.org/wiki/ACIS A bit of ACIS trivia...before designing the ACIS kernel, these guys designed ParaSolids. >>If Shark FX is a realy CAD program, i think you should resolve this >>(problem), right? The tool is behaving correctly:) Tim
		Tim Olson IMSI Design/Encore


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jlm		#7 Posted : Wednesday, January 28, 2009 1:21:07 PM(UTC)
Rank: Senior Member Joined: 2/18/2007(UTC) Posts: 1,241 Location: Paris & Frankfurt Thanks: 211 times Was thanked: 151 time(s) in 96 post(s)		Originally Posted by: Tim Olson The amount it adds is a function of the bend angle and radius. Note in the image I attached the outside radius is larger then the inside radius by the material thickness. Consider this the stretched or expanded region. Dear Tim, I agree with Antoine : it should use the "neutral fiber" (medium line) as the reference radius to bend a solid, as it happens in real life. It should compress as much inside as it expands outside... JL
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Tim Olson		#8 Posted : Wednesday, January 28, 2009 1:38:12 PM(UTC)
Rank: Senior Member Joined: 2/2/2007(UTC) Posts: 5,447 Was thanked: 499 time(s) in 353 post(s)		Originally Posted by: jlm Dear Tim, I agree with Antoine : it should use the "neutral fiber" (medium line) as the reference radius to bend a solid, as it happens in real life. It should compress as much inside as it expands outside... JL JL Then bend around a line in the middle of the body. The bend I'm showing is a bend on the top of the face. The neutral line (where no compress/expansion occurs) is defined by the two points for the bend axis. Tim
		Tim Olson IMSI Design/Encore


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la mouche		#9 Posted : Tuesday, February 3, 2009 3:36:39 AM(UTC)
Rank: Senior Member Joined: 3/14/2007(UTC) Posts: 757		Hello, Thanks Tim for your explanation. Cordialy. Antoine


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