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Recent content by ghostdigital

  1. ghostdigital

    NPT thread strength - Stress Distribution / Tensile Area

    These guys got a Pipe Thread Installation Torque and Hoop Stress calculator https://www.engineersedge.com/hardware/pipe_thread_installation_13424.htm
  2. ghostdigital

    Crazy cantilevered steel deck

    State of maintenance will matter years from now..
  3. ghostdigital

    How Can You Prevent Laser Cutting Machine Head Collisions?

    I elevate my laser head high and run the program with laser power off and observe the travel. This is a good idea on the first setup and cut for anything you CNC program.
  4. ghostdigital

    composite tolerance at lmc : is it nonsense?

    By default tolerances of location applied to threaded feature apply the axis as derived from the pitch circle (diameter). Since the variation of pitch diameter of a 8-32 unc thread is about 0.0015 (verify) the "Bonus" tolerance at LMC is minimal Assuming that there is actual logic in this...
  5. ghostdigital

    Perpendicularity callout with curved datum

    Yes, on second look you're right there still needs to be a orientation control on Datum A.
  6. ghostdigital

    Perpendicularity callout with curved datum

    "IF" datum A was a datum target line, with a specified location it would work. Or, if an additional datum (B?) was specified in the FCF which would orient Datum A - that would work. As is - the orientation relative to Datum A is unspecified.
  7. ghostdigital

    Dimension representation.....

    I suppose one could do that however when a dimension is not to scale it should be underlined..
  8. ghostdigital

    Help Identifying Callouts in an Old Drawing

    Those are Datum lines, targets and areas. The balls indicate the type of simulators for gaging and location
  9. ghostdigital

    Unilateral tolerances-why?

    "Can someone explain to me why you would ever desire to basic a print at the MMC with one sided tolerance?" Old school.. Before CNC's we manufactured stuff with manually operated machines and the strategy for the machine operator (machinist) was to remove just enough material to achieve MMC...
  10. ghostdigital

    Why flatness tolerance associated with a FOS must be less than the size tolerance?

    This is correct but only for selected form tolerances applied to the size dimension or FOS. Same applies for straightness specified to the FOS but not the surface exclusively. Excludes cylindricity... When a flatness is specified to a surface it is a refinement of the surface, thus the limits...
  11. ghostdigital

    .140 True Position on a Large Composite Part

    "vendor agreed on true position of .020" likely somebody other than the tech build it folks.. "composite parts" This material moves around and rarely holds form in an unrestrained condition. Tolerances are measured with a component in a free state condition unless otherwise specified. "I find...
  12. ghostdigital

    GD&T without concentricity

    Concentricity, as defined in previous ASME and ANSI standards is not what you think... not interpretated per the word definition "Concentricity". I would strongly recommend that you review the applicable standards for the interpretation of Concentricity not the dictionary. Position tolerances...
  13. ghostdigital

    Confusion about positional tolerance for rectangular pins

    The datum C and B are derived from the center of the two center planes derived from the features. The Datum B center planes are derived from the horizontal surfaces and the Datum B center planes are derived from the vertical surfaces features. Both are legitimate.
  14. ghostdigital

    Continuous beam on multiple closely spaced rollers

    Ensure the FBD is correct in a reputable statics load modeler..
  15. ghostdigital

    Non-breaking spaces and hyphens

    You've been posting using the html code editing option by clicking the </>? The WYSIWYG editor seems to work well to achieve a non-breaking spaces by just typing the space bar on your keyboard.. I suspect that for security and potential hacking reasons the forum folks disabled selected html code.

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