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Additional MMC

MattyRyan
Hey everyone,

I apologize if this seems redundant, I tried looking through the forum first before posting.

I see quite a few topics about feature control frame call-outs of multiple diameters with MMC and how to apply it in PCDMIS. I'm still not entirely sure I've come across the answer (if I did and someone has that information I'd greatly appreciate it). I've tried a few different ways to apply it, but nothing gets me to the answer I know I should have (based on diameter sizes, etc.). I'm simply looking for the steps on how to apply the additional MMC. The following is what I'm looking to dimension out in PCDMIS.



Any help on this is greatly appreciated. Again, I apologize if this sounds like a redundant question, I'm just really stumped at the moment.
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  • is correct. The callout is backwards and the tolerance should come before the datum references. However, ignoring that, this is how you are supposed to approach this in PC-Dmis....


    I assume you have a recent version that uses the geometric tolerance command?

    You firstly need to add a geometric tolerance to control the relationship of B to the higher precedence datum A. This tolerance will be used to calculate the MMB boundary for the secondary datum B(M).
    Next you must add a geometric tolerance that defines the relationship of C to the higher precedence primary datum A and secondary datum B(M). This tolerance will be used to calculate the MMB boundary for the tertiary datum C(M).
    Lastly, create your geometric tolerance from your screenshot. PC-Dmis will look up through the routine for datums B(M) & C(M) and use that data to calculate the MMB boudaries for the A|B(M)|C(M) datum reference frame.

    refer to Y14.5-2009 Fig. 4-16 and para 4.11.6.1
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  • is correct. The callout is backwards and the tolerance should come before the datum references. However, ignoring that, this is how you are supposed to approach this in PC-Dmis....


    I assume you have a recent version that uses the geometric tolerance command?

    You firstly need to add a geometric tolerance to control the relationship of B to the higher precedence datum A. This tolerance will be used to calculate the MMB boundary for the secondary datum B(M).
    Next you must add a geometric tolerance that defines the relationship of C to the higher precedence primary datum A and secondary datum B(M). This tolerance will be used to calculate the MMB boundary for the tertiary datum C(M).
    Lastly, create your geometric tolerance from your screenshot. PC-Dmis will look up through the routine for datums B(M) & C(M) and use that data to calculate the MMB boudaries for the A|B(M)|C(M) datum reference frame.

    refer to Y14.5-2009 Fig. 4-16 and para 4.11.6.1
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