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Recent content by BMDesign

  1. BMDesign

    Defining Heat Generation Rate for Solenoid & Motor in thermal simulation

    I have the duty cycle of the solenoids, but the stepper motor is on all the time. And it generates a lot on heat, on ambient both motor and the solenoids shoot up to 65-70 deg C.
  2. BMDesign

    Defining Heat Generation Rate for Solenoid & Motor in thermal simulation

    How to define the heat generation rate for Solenoids and Motors for thermal simulation. I know the power rating for these components, but again some of the energy is used for mechanical action rest is wasted as heat. Do I have to use the total wattage or fraction of it while defining the Heat...
  3. BMDesign

    Living Hinge Design for Celcon M90 ( Acetal Copolymer)

    Thank you all for the suggestions. I know it has to PP or PE, but for this application it has to be Acetal only. Design looks fine, no sharp edges, thin cross section, length of hinge is ine too. I took the guidlines from 'Designing plastic parts for Assembly' by Paul A Tres. After the initial...
  4. BMDesign

    Living Hinge Design for Celcon M90 ( Acetal Copolymer)

    I am designing a 90° bend living hinge, But it is cracking, can anyone help or send me design guidlines for living hinge with Celcon material. thanks Maninder
  5. BMDesign

    Specifying GD&T on a Hex machined nut

    You are right Cory, Forged Hex surfaces need to be defined datums first, and threaded hole will reference to the datums.
  6. BMDesign

    Specifying GD&T on a Hex machined nut

    Thank you for the replies & sorry about not giving enough information. -Nut is forged in hex shape, and forged hex shape is not machined after. -based on these hex flats, threaded hole in the center need to be machined. CheckerRon, you are right I want to use the forged hex as a datum to...
  7. BMDesign

    Specifying GD&T on a Hex machined nut

    Hello, I am trying to define GD&T on machined hole inside a Hex shape. Nut is forged and then machined. Inside machined hole has to with in .005" of outer Hex shape. thank you !
  8. BMDesign

    Roark's formula for square plate

    Hi goahead, http://www.roarksformulas.com/rytutor.html for that link I need to have that software or book. I knew that but I don't want to spent the money as I might not be using it again. So any free link or access to the formula.
  9. BMDesign

    Roark's formula for square plate

    Can someone has the Roark's Formula( or link) to find the stresses in square steel plate, supported on four corners with or without hole in the center. Thanks

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