"Plastic Part Design" 1

[toolin]

Most design guides I've seen use a 50% to 60% rib to wall ratio, and illustrate a 90° rib to wall figure. Question is, how do most designers check rib to wall when the rib intersects the wall at an angle? Do you just check the rib thickness? Or do you check the hypotenuse of the intersection?

 

[insideman]

Mostly we just consider the ratio between wall and rib thickness. For crystaline materials (PE, PP, POM, nylon), use 50% rather than 60 or 66%.

Pat

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