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  1. BobPar

    Certified Drawing

    "Does anyone have any familiarity with Certified Drawings". Pete, The term certified mainly applies to civil drawings in my experience. When I was working for a Civil Engineering firm all drawing being submitted for County approval had to be marked "Certified Drawing" and signed and stamped with...
  2. BobPar

    Need thread torque for plastic hub

    I need to calculate the torque required to use a thd cutting screw #6x.25 which will thread into a plastic hub with a hole size of .115±.004. Plastic material: ACETAL HOMOPOLYMER OF DELRIN 150 OR 500 SERIES. Between the screw and hub is another plastic hub of the same material where the head of...

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