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  1. cthompson68

    Elastic cord replacement material

    I have an application where I am in need of an elastic cord. Similar products on the market are the Goody elastic cords (http://www.goodycomfort.com/main.taf?p=1,4) used which are used as hair bands, and are only available in a few sizes. I have considered using an o-ring as various standard...
  2. cthompson68

    28-400 SP Neck Finish Closure (Cap) model

    I am looking for a 3-D CAD model of a generic 28-400 SP Neck Finish Closure (Cap). I have notice similar requests in other threads which are now closed" Bottle Thread: http://www.eng-tips.com/viewthread.cfm?qid=171032 Bottle Cap Thread: http://www.eng-tips.com/viewthread.cfm?qid=220854 As...
  3. cthompson68

    Suggested material for leaf spring?

    What is the material typically used in creating leaf springs for consumer parts? Is it 17-7 PH stainless steel, 316 S.S., or some other steel material? Specifically, I have seen leaf springs used on portable garage door openers that mount under the visor in a car, and the sheet metal is approx...
  4. cthompson68

    Allowable strain of polypropylene (PP)?

    I have a questions about the material property of PP . I found this article regarding cantilever snap fits. My FEA software is not suited for plastics with non-linear stress-strain curves. I have a similar design manual from BASF Plastics and was looking for additional information about...
  5. cthompson68

    Two-shot, Co-Injection, or In-Mold Decorating?

    I would like to know the pros and cons when comparing two-shot (two-color), co-injection, and in-mold decorating to each other. What is the general cost and availability if manufactured in the United States? I have designed overmolded parts (plastic with elastomeric overmold) in the past. This...

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