Hi All, I'm starting to have various sizes of vacuum-operated
pouch tools manufactured, but I've run into a bit of a problem.
Specifically, the question is: What's the correct contour of a pouch?
About the only parameter that everyone seems to agree on is that the
depth of the pouch should be 1/8" in the center. On the other hand,
the shape of the 'dish' seems to vary widely. I've attached four
pictures/diagrams of pouch tools and it's easy to see the differences.
If there is an optimum contour, how is it defined? Does it vary from
manufacturer to manufacturer?
I look forward to your opinions.
John A Tuttle
Brick, New Jersey, USA
[ contour of pouch 1
[ contour of pouch 2
[ contour of pouch 3
[ contour of pouch 4
[ I believe the unsupported portion forms a catenary, the curve of a
[ hanging chain. See https://en.wikipedia.org/wiki/Catenary -- Robbie