ISO GPS (GD&T) Mini-series - What are Datums

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Datums Explained!

Understanding Datums in GD&T - a pivotal concept in geometric dimensioning and tolerancing.
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A functional based ISO GPS is always using datums for the simulation of natur contacts (which appear between two parts) at a single part specification (where the contact partner is missing, isn‘t it?).
A functional based specification is not using datums for orientation in manufactoring processes like verification instead of nature function (we are talking about „fit“ or „touch“ according ISO 5459 -> fit only at linear sizes).
If the nature contacts are not suitable for manufacturing processes, the nominal design itself should be optimized - not the functional based ISO GPS (remember ISO 8015!)

chrmeiss
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