Is anyone here an expert, or at least really good, in GD&T as it relates to profiles of a surface? I'd like to be able to share with someone a print I'm working on putting this type of tolerance on.
Jason
Profile of a Conical Surface (GD&T)
Feb 04, 2008
1 Replies
I don't know what the drawing standard calls for, but in the optics drawings I've done and seen conics are typically laid out in the following steps.
- Give the equation for the conic in the notes, making sure to use well annotated datums for the coordinate axes (e.g. apex of the parabola, planar backside, axis of symmetry, etc).
- Present a table of points that includes all the locations of interest. In the case of a round aspherical lens with diameter D, the table would show Z for R=3D0 to D. A 2D table can also be used to represent 3D dimensions (XYZ).
- Sometimes specific points of interest are assigned as datum targets.
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