Earlier today I had a 1st piece that a vendor brought in to get approval for a diameter with high runout. Our callout was for .003, they were getting .004, and also showed me a line profile CAD graphic from their MCosmos run machine where their max deviation was ~.004, value of the profile about ~.008. I use PcDmis and it has a profile modifier which let me replicate their line profile measurement value but I was still getting ~.007 for my runout. I saw that my graphic was much more shifted to the left than theirs and tried to break down why.
It ended up being approved because of the application (unrelated to the measurements I got), but I want to know what other people use for their settings to get positional.
The position of the diameter I was measuring had x-y values of -.0032 & .0001 when reported respectively, but in LSQ the values were -.0017 & .0004. The difference being almost double in true position value, what is the standard way to report the feature? I know PcDmis default reports everything as outer tangential, not just the datums, but is that standard in MCosmos? This was my first time reading a report from that software and I don’t know if the runout was only reporting their roundness or something because it didn’t specify a datum with it like in the PcDmis report window.
submitted by /u/CartoonsAndSurreal
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