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  1. esqrkim

    O-Ring Material for Molds

    wgknestrick, First of all, make sure the amount of compression applied to the static seal O-ring is within the recommended amount for the O-ring width and the O-ring material. The depth of the O-ring groove in the mold would control this. Secondly, I have never used viton in a mold before. For...
  2. esqrkim

    Method to Retain a Small Disk within plastic

    CPosner: Is having a pleasing aesthetics a design requirement? Is it a company goal or a personal goal? If it's a company goal, then no one should have any issue about spending the extra money on tooling, molding, and assembly. The "push-in" snap cap or some form of molded cover as...
  3. esqrkim

    Injection moulding Tolerances

    Exactly as dgowans said. In general, pay more attention to what you as a product designer need rather than any other thing. If there are conflicting issues, the toolmaker/molder will let you know. Then you can address the issue at that time. In some instances a toolmaker/molder will find...
  4. esqrkim

    Method to Retain a Small Disk within plastic

    You cannot insert mold the disk unless you're willing to live with a small openings to the disk. It looks like making it water tight is not essential. I'd go with the snap fit disk method. It's clean. Straight forward in terms of tooling and molding. No post op. Hey, what more could you ask for...
  5. esqrkim

    Injection moulding Tolerances

    mrlizzard: My advise to part designers are these: 1) +/- 0.002 to 0.005 is fine. +/-0.001 is possible for smaller parts, but it's still pushing it. 2) Don't break your neck trying to second guess the moldmakers or the molders on how they will meet your design needs. Just give them what you...
  6. esqrkim

    Snap Fit/Snap Latch Design - Irregular Geometry

    CPosner: If possible, can you attach an image of the snap-fit system you are designing? It's hard to picture what you are describing, and a picture is worth a thousand words. **My comments are my opinions, and results are not guaranteed** Eugene Kim www.eeksolutions.com
  7. esqrkim

    Snap Fit/Snap Latch Design - Irregular Geometry

    Hi CPosner: The aspect ratio of 1.5 to 1.25 seems to be quite stubby, but if you can still remain within the elastic range when it is fully deflected. It should work. Concerning the 60% strain: I do not see any problem with the 60% strain. Just make sure you provide a physical stop so that the...
  8. esqrkim

    Part failure - need help figuring out why - Stress Concentration

    Either the two pictures of the broken end piece are not the same piece, or there are two welded-on blocks on both sides of the broken end piece. I thought only one block was welded onto the end piece. In any case, I think the end piece broke due to a hair line crack. The crack most likely...
  9. esqrkim

    Thin wall injection mould

    sizzer33: I agree with the flash gate mentioned above. Another option, however, would be to use a hot runner system with one or two nozzles dropping down to the bottom-side of the part (59.5mmx20mm side assumed). I would prefer two evenly distributed nozzles because of the thickness of the...
  10. esqrkim

    Can I get a one off mold in Southern California?

    midvail: Depending on the size and complexity of your part, you can have an injection mold built within 4-6 weeks. I know a place in Southern Cal that would be happy to accomodate you. It's a company I used to be with before I got into consulting. By the way, I do not charge anything for...

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