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Date : March 15, 2015 02:37
Title : There is quite a difference...in my opinion.
Body :As Agjah and others point out, it's not merely draft angles that may be missing. Without making a book out of his article, there are many aspects to designing plastic injection molded parts such as thinning out ribs, sharp corners where you don't want sink marks and radii where added strength is needed. There may be places that require ejector pins and maybe a boss needs to be added or adding a slide for a required snap. There are material issues such as using a high percentage of glass for strength that may require a change in shape for fill or flow. There are gating types such as fan gates, overlap gates and film gates that need to be positioned for both function and cosmetics. And on and on. I've been a design engineer all my career, but I also have an artistic flair. In my business of 34 years, I've used industrial design firms and have often had to re-shape features for one reason or another. A DE firm such as mine will sometimes hire an ID firm, but I've never seen it the other way around. I can only assume that when one doesn't know, one doesn't ask. Yes, I agree, it's a recipe for disaster.