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Recent content by njlee

  1. njlee

    accuracy in solidwork

    I tried almost every single file formats available in SW. so far, the best result (not perfect) is 1. export w_t format from SW 2. reimport it back to SW 3. export it again in STEP from SW 4. import STEP file into Pro/E lee
  2. njlee

    accuracy in solidwork

    Thanks for the reply. I'm having problems exporting solidwork model into Pro/E ( surfaces didn't connected, surfaces weren't tangent to each other, edges of surfaces looked faceted not smooth, ....) In Pro/E, users can increase the part's accuracy so that they get higher quality exported files...
  3. njlee

    accuracy in solidwork

    Hi all, how do you increase the accuracy in solidworks? Thanks, Lee
  4. njlee

    high resolution mpeg file from design animation

    Hi all, does anyone know a way to export high resolution movie file from design animation module? I can only get screen capture quality movie from it. thanks, lee
  5. njlee

    how vacuum regulator works?

    Hi all, Could anyone explain how a vacuum regulator / pressure regulator work? My understanding is a regulator is used to create 2 chambers of different pressure readings. If a diaghram is used, how can air goes from one chamfer to another? Thanks, Lee
  6. njlee

    locking taper angle

    Hi all, what is the standard angle for a locking taper? Does it depend on mating materials? A taper machined onto two mating parts such that when the parts are mated the frictional forces are so great will not rotate or move with respect to one another. No clamping forces are required to keep...
  7. njlee

    design for medical sterilization question

    Thanks for all the replies. open bottom float is good suggestion. what i need to know is whether part with seams is an "ok design" (not good design) for medical sterilization. If things get trapped in the seams, pre-sterlization conditioning like rinsing and cleaning is the only way to remove...
  8. njlee

    design for medical sterilization question

    hi all, I'm designing a plastic float which will be subjected to medical sterilization such as ETO, autoclaving and hydrogen peroxide gas plasma. I'm thinking about doing a 2-piece design which will be snapped together with o-ring in between for preventing water from getting into the float. I'm...
  9. njlee

    aluminum casting wall thickness

    Thanks for all the response. The summary is : consistent wall thickness is good casting design practice, but sometimes "it is cheaper to hog out the extra metal than put the extra cost into the casting". now I know I don't have to put as much effort into shelling out the casted part as...
  10. njlee

    aluminum casting wall thickness

    Hi All, For aluminum casting part (sand cast, permanent mold or investment casting), do we need to core out the part? I have seen a lot of casted parts with very thick section. What is the recommended maxinum wall thickness for a part size of about 3" X 2" X 24"? Thanks, Lee
  11. njlee

    coefficient of friction for plastics

    hi, Thanks for the response! I will check out the GE site. I'm not doing any snap fit ball joint, the load will be very small (0.5 lb to 1 lb, 1 inch diameter ball), the contact will be close to line contacts (top and bottom of the ball). Acetal on PC is my first choice but I need to explore...
  12. njlee

    coefficient of friction for plastics

    hi all, where can I find info about coefficient of friction for plastics? any good websites or books? i'm designing a ball joint and thinking about using pp on pc Or pp on pp. I also need to know the compatibility and wear issues. I can find info regarding individual plastics but i need to know...
  13. njlee

    elastomer for spring

    Hi All, I'm thinking about using TPE/elastomer material as a spring, like wave washer or flat spring. Has anyone done something like this? creep might be an issue? how do you predict spring force? thanks, Lee
  14. njlee

    curved lead screw

    HI All, I got it. The implementation of the curved lead screw is almost identical to the straight screw, except that the teeth are circular patterned on the single ruled arc (the tooth is radially spaced / duplicated about the same arc). I made an SLA protoype and it worked. Thanks, lee
  15. njlee

    curved lead screw

    Hi all, Thanks for the replies. Long story short. I was challenged by an industrial designer to come out with a working plastic curved lead screw design for a medical device project (apparently, designers prefer arc over line). I agreed with him because of the fact that the payoff will be big...
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