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First — Any profile control called out without a datum is nothing more than a form control similar to flatness, circularity etc.

ISO 1101 Virtual Condition Size - The boundary generated by the collective effects of MMC, size limit of a feature and any associated geometric tolerance, virtual condition must be considered in determining the fit between mating parts.

What does the grey tick mean on messenger? However, the four ones I am talking about the most familiar to all of us.

it is because we inspected the same piece with two different equipments using the same alignment method manual.

Remember that the profile control specifies the total amount of tolerance available.

profile of a line 0.

This is different from company to company though.

If you have datums called out you are controlling size, location, orientation and form of the affected surface.

1 away from true position gives you a reported diameter of.

Let us know if you have further questions.