I'm trying to revolve cut a shape but my main body is an ellipse shape. The revolve seems to go around a circle but I get a weird point so the surface isn't smooth.
I'm trying to revolve cut a shape but my main body is an ellipse shape. The revolve seems to go around a circle but I get a weird point so the surface isn't smooth.
Hello,
I don't have access to SW at the moment, so please forgive me if I'm repeating, inaccurate, etc.
If your current cut profile is elliptical, then what follows doesn't probably won't help much.
As another point of attack, how about an elliptical profile cut, instead of a circular one, to better match your part (although perhaps harder to fab)?
Either change your current profile to a quarter ellipse or swap axes:
1) Draw the cut profile in your current plane, except make it semi-elliptical and have it extend across the long axis.
2) Draw a construction line, for the revolve axis, on the ellipse's long axis, dimming it to get the final required length.
3) Do a two direction revolve cut, parallel to the recess' bottom surface, swinging enough of an angle (+/-90°) that doesn't cut into the part at the recess.
I'm not sure what you meant by "weird", but cutting a circular profile onto the end of an ellipse will "funk" things up a bit visually, especially because you're cutting your recess' edge.
This is still a circular cut, I just swapped axes and hopefully the elliptical profile improved the aesthetics..
Anyway, I hope this helps.
Cheers,
Kevin
Darr
As another approach, you can use your sketch to make a "revolve boss/base" feature with "Merge Result" turned off, scale the new body in the Y direction, then combine that body in subtract mode from your model. I am not saying this is the best solution, but maybe it offers you some other opportunities.
Dwight
That's a great idea, as it will let you cut away from your existing body. I'd just worry about the scaled body matching up perfectly with the original, although theoretically it should be able to.
I like it. Using that method, you could create the whole body as a cylinder to start with, create the revolved cut, the scale down to the elliptical form and add the other features from there.
Dwight's Idea works great and is easy to do. Carry the decimal places out int the scaling out as far as possible.
You should do a swept cut using the outside edge of the ellipse as the path. Actually I don't think that will give you the result you are looking for.
One option is to create this end shape using the Dome feature, but this would need to be done before cutting that hole.
Another option is to create a lofted surface between a section of the ellipse and a point on the end, and set the Start/End constraints such that the surface has the right tangency. Then use the surface to cut the part.
You can see my attached file for the latter example. For some reason Cut with Surface and Intersect tools didn't work, so that's why I used thickened cut.