I have a drawing with at least 15 datum structures.my question is this.if datum -e- is the same as datum -d-
as in both being the center of the part is it ok to perform a scan on a profile feature that has a datum callout to datum -d-, to datum -e- alignment.in this case I feel aligning to -e- is more accurate due to the fact it is a circle. datum -d- is outside of part with very little straight surface area to measure.keep in mind I am using a model.I have customer returns and I have moved my alignment several times to see if scan results change the results have all been the same.seems to me if x y z coordinates are correct the scan is accurate.the datums used are center of part -d- or -e- as well as -x- and -y- which is another profile feature on other end of part which I know were specifically machined with the same tool.customer sees .0001 to .015 tolerance variance. tolerance on this profile is +-.0015 Ille take any help I can get.
