Cylindricity and roundness

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  • Cylindricity and roundness

    I have a metal sleeve that goes into a crankcase cylinder before the die is closed and a shot made. This cylinder has cylindricity called out with a tolerance of .002. I created an auto-cylinder and reported the cylindricity(oh and by the way cylindricity is a new icon on the dimension toolbar in 4.0 and above), it measured in tolerance. I created 4 auo-circles, reported out the diameter and circularity, and 3 of the 4 were OOT for circularity. Can anyone tell me what I am seeing? This doesn't sound right to me? Am not thinking this through properly? Here is a snippet...

    Auto-Cylinder info...

    DIM CYL1_D= LOCATION OF CYLINDER CYL1 UNITS=IN ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
    D 2.3886 2.3905 0.0025 0.0025 -0.0019 0.0000 -#-------
    END OF DIMENSION CYL1_D
    DIM CYL1_M= CYLINDRICITY OF CYLINDER CYL1 UNITS=IN ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
    M 0.0020 0.0000 0.0020 0.0000 0.0020 0.0000 --------#

    Auto-circle info...

    DIM CIR_1_D= LOCATION OF CIRCLE CIR_1 UNITS=IN ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
    D 2.3872 2.3905 0.0025 0.0025 -0.0033 0.0008 <--------
    END OF DIMENSION CIR_1_D
    DIM CIR_1_M= CIRCULARITY OF CIRCLE CIR_1 UNITS=IN ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
    M 0.0050 0.0000 0.0020 0.0000 0.0050 0.0030 -------->
    DIM CIR_2_D= LOCATION OF CIRCLE CIR_2 UNITS=IN ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
    D 2.3886 2.3905 0.0025 0.0025 -0.0019 0.0000 -#-------
    END OF DIMENSION CIR_2_D
    DIM CIR_2_M= CIRCULARITY OF CIRCLE CIR_2 UNITS=IN ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
    M 0.0022 0.0000 0.0020 0.0000 0.0022 0.0002 -------->
    DIM CIR_3_D= LOCATION OF CIRCLE CIR_3 UNITS=IN ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
    D 2.3890 2.3905 0.0025 0.0025 -0.0015 0.0000 -#-------
    END OF DIMENSION CIR_3_D
    DIM CIR_3_M= CIRCULARITY OF CIRCLE CIR_3 UNITS=IN ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
    M 0.0019 0.0000 0.0020 0.0000 0.0019 0.0000 --------#
    DIM CIR_4_D= LOCATION OF CIRCLE CIR_4 UNITS=IN ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
    D 2.3889 2.3905 0.0025 0.0025 -0.0016 0.0000 -#-------
    END OF DIMENSION CIR_4_D
    DIM CIR_4_M= CIRCULARITY OF CIRCLE CIR_4 UNITS=IN ,$
    GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
    AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
    M 0.0026 0.0000 0.0020 0.0000 0.0026 0.0006 -------->
    sigpic

    James Mannes

  • #2
    Is everything equal? I mean are the circle hits and the cylinder cross section hits in the same place? If there was form error thats how the dimensions would look.
    Badges..... We don't need no stinkin badges.

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    • #3
      No, that was the problem. I was re-doing someone's work and the cylinder was not created the way I would have done it (15 points 5 levels vs. their 5 points and 5 levels). Caught it after I posted. Thanks anyways.
      sigpic

      James Mannes

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