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  • Users: JMorton99
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  1. JMorton99

    Surface Datums

    To add, the surface is curved and complex. Not a planar surface.
  2. JMorton99

    Surface Datums

    Hello, When defining datums, does defining a surface datum constrain all 6 reference planes and axis? Would my part be fully constrained by a datum simulator or would I need to define one or two more planar surfaces? What type of machine or simulator is used to define a surface datum? I want...
  3. JMorton99

    Defining Positional Tolerance of Hole Using Surface Datum

    Hello, Another question I had was if it is necessary in this case to add the Maximum Material Condition? From my understanding it adds tolerance as the hole size goes from MMC to LMC to ensure mating will occur within the Virtual Condition. This is for interchangeability. However, for my part...
  4. JMorton99

    Defining Positional Tolerance of Hole Using Surface Datum

    Hello, To follow up on your comment. You are suggesting then that each hole axis would become a datum? So then by your suggesting, the surfaces would then be perpendicular to [A|B|C] OR [XX|B|C] where "XX" is the respective hole axis datum? This approach would require 1 additional view at a...
  5. JMorton99

    Defining Positional Tolerance of Hole Using Surface Datum

    Hi, As it stands, the part in the drawing (Call it Part A) will be mounted on an arm. It will be positioned then fastened through the .266D hole. The "MARKED A" holes will then be drilled through the arm and Part A, where pins will then hold the two parts in position. The part that will be...
  6. JMorton99

    Defining Positional Tolerance of Hole Using Surface Datum

    Hello, I am new to GD&T. I have just started to read ASME Y14.5M-2009. Attached is a capture of the drawing. It is a square block that is machined out, creating 4 unique planar surfaces. On these planar surfaces there will be 4 separate holes in which replaceable bushings will be mounted. They...

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