GD&T Datum Selection
GD&T Datum Selection
(OP)
I am having difficulty setting up the three datum planes for GD&T. I am trying to dimension this WRT to the way the part will be held down during insepection.
It is my understanding that the three planes must be perpendicular to each other. My primary and secondary planes (A & B) are perpendicular. The part is such that there is no plane perpendicular to both A & B. In real life, there will be a jig pin constraining the last DOF for the part.
How do I achieve this? Can I create datum C normal to A & B and through the point where the pin will be even though it won't lie ony any real surface? Do I use datum targets for this?
Any help is greatly appreciated.
It is my understanding that the three planes must be perpendicular to each other. My primary and secondary planes (A & B) are perpendicular. The part is such that there is no plane perpendicular to both A & B. In real life, there will be a jig pin constraining the last DOF for the part.
How do I achieve this? Can I create datum C normal to A & B and through the point where the pin will be even though it won't lie ony any real surface? Do I use datum targets for this?
Any help is greatly appreciated.





RE: GD&T Datum Selection
Chris
SolidWorks/PDMWorks 08 3.1
AutoCAD 06/08
ctopher's home (updated Jul 13, 2008)
RE: GD&T Datum Selection
I've never posted pics before. I hope it works.
Thanks.
RE: GD&T Datum Selection
RE: GD&T Datum Selection
Is it allowable to represent datum C with only a datum target and NOT show it as a datum plane?
Thanks!
RE: GD&T Datum Selection
RE: GD&T Datum Selection
Clear as mud?
Believe it if you need it or leave it if you dare. - Robert Hunter
RE: GD&T Datum Selection