Archive for October, 2008

Oct 01 2008

Delivery Performance

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While you get the constant chant to the contrary; COST ISN’T KING.  It only becomes king with excellent delivery performance.  This means on-time shipments that aren’t rejected, no air-express delivery, no arguing over a reject, or anything else.  Continue Reading »

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Oct 01 2008

THE IMPOSSIBLE VENT

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Vents are traditionally easy.  The key is making them large enough to let the air out but the depth and land properly sized so that the plastic doesn’t fill the vent during fill and pack.  Their purpose is to allow the plastic to push out air as the part fills.  If the air cannot properly escape from the cavity the results can be knit lines, burn marks or even trapped air.  Unfortunately geometry sometimes gets in the way:  We might have thin complex webbing, or a rib that traps air.  In may case you can simply put an ejector pin in the offending area the grind flats on the pin the depth of a traditional vent and use the pin as a vent.  Continue Reading »

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