wim
July 27, 2020, 3:19pm
9
Steve1:
Well I never !
FWIW, Steve, that’s what we’ve been trying to tell you over the course of several weeks and the reason why it’s not in Rhino. This is very material and process dependent and you need to get in touch with a manufacturer to get this right - or get software that claims to get it right.@BrianM ).
The neutral axis is between 0 and 0.5 x plate thickness and depends on corner radius and bend method. For thin sheet with sharp corners it’s close to 0. I’m currently working on a project with 8mm thick free bend steel. With an inner bend radius of 15mm the neutral axis ended up being at 3.5mm from inside radius giving a k factor of 0.4375, and some parts with inner radius of 4 need a k factor of 0.33
Asked and answered in the other thread.
I’d suggest hiring someone with sheet metal tools to help with with your short term immediate need.
Rhino doens’t have parametric sheetmetal, that’s a very specialized thing. Even if your CAD HAD it…well are YOU making these parts or are you having them made? 'Cause the way workflow works in Rhino is to just model what you want the result to be and then the parts supplier will model it up in Inventor or something with all their own k-factors(which can vary from machine to machine) and the right corner details and make you the parts–which they may do regardless of your CAD. If you want a genera…
Several different items:
How to unfold a thin surface.
Where to place the “neutral surface” to use in unfolding sheet metal calculations to best represent physical reality. This question has been around since before CAD and there is not single, universal answer.
What modifications to make to the results of unfolding a neutral surface to better represent physical reality. This also depends on the particular circumstances and does not have a universal answer.
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