Tag: DFM
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Living Hinge Design Rules That Work for PP and PE
Part Design Guide A living hinge that cracks in the first week usually failed for one of three reasons. Wrong resin, a land that is too thick, or flow running along the hinge instead of across it. Fix those three and a PP living hinge design survives a million flex cycles without drama [VERIFY]. Everything…
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Boss Design for Self-Tapping Screws in Injection Molded Parts
Screw Boss Design Boss design for self-tapping screws comes down to four ratios. The boss wall runs 50 to 60 percent of the part wall, and the outer diameter runs about twice the screw diameter. The pilot hole sits near 80 percent of the screw diameter, with thread engagement of at least two screw diameters.…