Does anyone have insight of how the best way to model and represent an o-ring within an assembly? This particular scenerio I have is a static face seal, but I would like the same procedure for rotary seal config. The seal should represent the compressed state. This would also allow me to compare the compression design values to standards.
After some fiddling, I figured out one way which was to sketch a construction circle the nominal diameter of the o-ring as well as a line representing the depth of the groove. The o-ring center corresponds to the midpoint of the const. line. Locating the the o-ring center was just an equation from the groove dimensions.
Maybe there is a more logical or universal technique?
Everybody I talk to seems to have a different method based on the application. One of the easiest to work with is to just model the o-ring to the gland dimensions (square profile). Then in your case you would need a different configuration for face or axial seals. Or, you can you some variation on contruction lines in layout sketches as you've already tried.
Myself, I model the gland, then drop in the o-ring just to fill the BOM.
Like Dale said, everybody seems to have their own preference on this. I show mine the same way I always did on the board. I have modeled them as ellipses with it tangent to a plane. Then for a static seal that plane is conincident to the sealing surface. For round inserts, I use a different mating scheme, but the o-ring is still shown as an ellipse. This indicates that it is under compression.
YMMV
jk
krupnikas,
I use a revolved ellipse. The minor is the compressed height and I exaggerate the ellipse major to show the ID and OD as being squashed.
Ken B.
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