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Core Pin alignment

JCG87
Hello,

this is my first post and I just have a basic experience with CMM's and PC-DMIS. I am having a hard time figuring out how to align a core pin (see picture below). I have the .IGS model uploaded and I tried to align the part using a cone and a circle. Then I was trying to measure an inner diameter of the core pin the probe on the 3D model was in the correct position (height) but the physical probe way far from the core pin in the Z axis (height).So I guess there is an alignment problem. I used a cone because the outer section of the core pin have a 0'' 34' dft in the surface. Any suggestion how to align the core pin?
  • A good place to start is usually the print requirement.
  • A good place to start is usually the print requirement.

    The print requirements established that the origin is at the bottom/base of the core pin. I previously aligned the traditional plane/line/point alignment and the quick alignment but never with conical parts, so I I am kind of lost here.
  • Posting some code would be an awfully kind and helpful gesture, just say'n! Sunglasses
  • If you're not concerned with the clocking of the pin...and all you want is that inside diameter.... and (assuming you have no experience using iterative alignments)...I would:

    Measure the inside diameter
    Measure 1 point on the top
    Manual align: point level Z+...circle X and Y origin...point Z origin
    This clears up manual alignment

    Then hit DCC mode...do your clearance plane and whatever..

    4 hit plane on top
    ID cylinder at least 5 hits per level at 3 levels
    Level cylinder to Z+
    cyl X and Y origin
    pln z origin

    Once aligned, measure your part.

    I would measure AT LEAST three ID circles...equally spaced. Report the diameter for each circle. I would also construct the circles together as a cyl & report that diameter as well.


    Hope this helped.
  • The print requirements established that the origin is at the bottom/base of the core pin. I previously aligned the traditional plane/line/point alignment and the quick alignment but never with conical parts, so I I am kind of lost here.

    I use to get confused when a part has no clocking rotation. One thing to keep in mind pcdmis has never been a big fan of not full 6 degrees of freedom alignments. It has been known to cause floating nominals . I don't know in newer versions if this is the case. So in your example if there is nothing to clock to I would level the cylinder rotate a generic line for rotation about the level axis xy origin on cylinder and z origin bottom base.
  • To measure all the features on this part, I would also align the part on the table along the X or Y axis (instead of upright) and use a star configuration probe, if accuracy is critical between the bores, use 2 probes, one in X+ dir, ine in X- direction to eliminate probe rotations. The part would need to be manually aligned in X as the probe goes quite deep in the bore and could shank. This method also allows you to measure the bottom datum.
  • Maybe.............

    Measure cone
    Measure point on datum simulator that core pin rests upon
    Insert/constructed feature/(plane or line?)/alignment

    Level cone
    Rotate to constructed feature (xplus, or whatever you prefer)
    Translate x,y (cone)
    Translate z (point)
  • Clocking is easy. Set your work plane to which ever axis you want to clock to, and then in LINE CONSTRUCTION create an alignment line. That will create a line along the machine axis of your choice. Clock to that.

    Mike
  • Hi to all,

    How to do clocking of cylinder if there is cylinder in +z & x,y origin as A-B, Plane in z origin as C and lastly Line D-E in ???????
    I mean consider Cylinder as 3D line , Plane and again line? How it will work?

    Also axis Plane C and Cylinder is a same axis +Z. And unfortunately PC DMIS is not big fan of Leveling and rotating in same axis.

    See pic attached ?

    Any help would be greatly appreciated.
    Attached Files
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