Not seeing bonus

Good Morning All,
I'm stumped on why the bonus from cylinder 3 and cylinder 4 shows up in FCFLOC1 Size but is not applied in FCFLOC Position?
The only bonus I'm getting is from cylinder 5
Cylinders 3 and 4 are on the same axis and cylinder 5 is perpendicular to 3 and 4.
Any help is appreciated, thanks.

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WilliamL over 1 year ago

Try changing the feature name to not include the minus symbol or semi-colon and instead use an underscore? I'm not sure if this will help, but I know we shouldn't use common symbols used in equations.

See here :

https://docs.hexagonmi.com/pcdmis/2022.2/en/helpcenter/mergedprojects/core/06_pref_topics/Setup_Options_ID_Setup_tab.htm
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Michael R over 1 year ago in reply to WilliamL

Datum A is cylinder 3, cylinder 4 is Datum B, and a point on the end is Datum C.
Datums A and B are on the same axis therefore the A-B in the feature data frame to my understanding is the proper build with the minis sign separating A&B.
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WilliamL over 1 year ago in reply to WilliamL

Ah I see now, I've not had to use common datums yet personally, and did not know how PCDMIS generated labels for them. So your actual feature label names do not include the minus or semicolon?

Looked at the report again, and I apologize. I didn't even look at the first 3 reported items. Are you using Least Squares? I don't see the math type in your report window, unless that is removed in the report label format
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WilliamL over 1 year ago

Like this LSQ on my report window.

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bfire85 over 1 year ago

You don't get added "bonus" from datums. The feature shifts about the datums and once the feature hits the datum's maximum material boundary, it gives you a measurement.
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Michael R over 1 year ago

When I look in the position portion on the FCF I see a deviation of .0067 for cylinder 5
Then when I take away the .0021 bonus for the feature itself I'm now down to .0046
I also get .0009 bonus from Datum A cyl 3 and .0008 from Datum B cyl 4
If I take away the .0009 and .0008 from the remaining .0046 then my true position value that I report to my customer should be .0029
Is my understanding of this correct?
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Michael R over 1 year ago in reply to bfire85

Thanks for that,
The reason I included the MMC on A and B is because our customer has it on his True position callout.
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Schlag over 1 year ago

No bonus...... Story of my life in this industry...... Hope this helps....
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Michael R over 1 year ago in reply to Schlag

Thanks Schlag and bfire85 I understand now that the MMC on Datum A and Datum B are used on the Datum Shift only.
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Dismas121 over 1 year ago in reply to Michael R

Not correct. Datum shift is not bonus. It is, essentially, wiggle-room you would get from a hard gage from having datums that are different sizes from nominal. The datum shift permitted allows the target to move within the wiggle-room. How much it has moved is shown on your report as "FCFLOC1 Datum Shift". You can see there how much the target has been allowed to move and rotate. Bonus tolerance only comes from the feature of size that you are measuring for location. I would report to the customer :

Nominal TP 0.0000
Permitted TP 0.0021
Actual TP 0.0067 (OOT)
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