Can anyone explain about primary datum feature and secondary datum feature and ternary datum feature
I want details about this question I confused so many times in Catia design.
1 Answer
What are you confused about? There is a lot of information on the internet about datums and how to apply them to GD&T dimensions.
Are you having problems with CATIA? Maybe you can attach a picture showing what you are trying to do?
A C Venkat 14 Jun, 2018 03:01 AM If anyone ask me what is datum feature and that was given in drawings how to answer them
A C Venkat 14 Jun, 2018 03:03 AM Why that was given in drawings and how can I relate with 3d modeling.
Jack K 15 Jun, 2018 02:03 PM Since you haven't attached the drawing, I don't know why the datums were on the drawings. But they should be on the drawing when a GD&T tolerance references the datums.
Jack K 15 Jun, 2018 02:08 PM Typically a 3D model is based on the nominal dimension sizes, and the datum callouts can be ignored. If you want, you could add 3 planes to the model as references for the datums.
