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How do I cut an o-ring grove in the face of a cylinder?
alan_brunsman706
Member Posts: 7 EDU
The grove would be the shape of an o-ring but bent to the shape of the cylinder.
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Best Answers
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Sorry, I am not asking this correctly. The o-ring does not go around the cylinder. That is too easy. The o-ring is around a small hole in the side of the cylinder. It is on the side of the cylinder. The o-ring shape would be the same if you pressed it against the side of the cylinder.
I have tried doing this in Solidworks. I formed the curve and profile of the o-ring but I could not get it to cut the profile along the curve. no luck. It was easy to cut a flat o-ring grove but I could not put in the extra dimension.0 -
I'm not exactly sure what geometry you need, but here's one way to go about it.
https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/e2f1eae15625bdc140b7f720
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John's solution got me thinking about the newer Projected Curve.
https://cad.onshape.com/documents/18d823f88ac2b45dd10de9c0/w/7743cbf857f18503bbffe555/e/8c2ce9900185757dc7835163
www.accuratepattern.com5
Answers
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Model the o-ring in place, then Boolean subtract it from the cylinder with the"keep tools" option checked.
Or if you don't need the o-ring ring use a Revolve to cut away the groove.
Owen S.Business Systems and Configuration Controller
HWM-Water Ltd0 -
Does that cut a bent o-ring grove or a flat o-ring grove? To seat the o-ring properly I need the grove in the cylinder the same depth all round.0
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You can either use the Revolve feature which will allow you to perform a cut around the cylinder. Or you can take a look at this: https://www.onshape.com/cad-blog/custom-feature-spotlight-how-to-use-the-o-ring-feature1
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I agree with Sheldon. Just sketch a typical o-ring groove cross-section and revolve-cut it. That cross-section is typically just a rectangul with rounded corners and a specific ID/width to get proper fit and compression depending on the specific o-ring size you're using.0
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Sorry, I am not asking this correctly. The o-ring does not go around the cylinder. That is too easy. The o-ring is around a small hole in the side of the cylinder. It is on the side of the cylinder. The o-ring shape would be the same if you pressed it against the side of the cylinder.
I have tried doing this in Solidworks. I formed the curve and profile of the o-ring but I could not get it to cut the profile along the curve. no luck. It was easy to cut a flat o-ring grove but I could not put in the extra dimension.0 -
I'm not exactly sure what geometry you need, but here's one way to go about it.
https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/e2f1eae15625bdc140b7f720
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John's solution got me thinking about the newer Projected Curve.
https://cad.onshape.com/documents/18d823f88ac2b45dd10de9c0/w/7743cbf857f18503bbffe555/e/8c2ce9900185757dc7835163
www.accuratepattern.com5 -
Wow! Thanks for the help.
I have one more variable that I did not include. The cylinder needs to be tapered along the axis. A slight draft like a injection mold draft would work. How hard is that to add? The draft is on the o-ring side. Follow?0 -
It's like that herealan_brunsman706 said:Wow! Thanks for the help.
Here is my take on it. Hopefully I've understood the direction of draft required. Someone else may have a cleaner method but it's a start:-alan_brunsman706 said:I have one more variable that I did not include. The cylinder needs to be tapered along the axis. A slight draft like a injection mold draft would work. How hard is that to add? The draft is on the o-ring side. Follow?
https://cad.onshape.com/documents/65bfff954a1a1e427f2d5c6a/w/7528c1745d261331f48fc094/e/e5e6a6f4b839dc1e68b57d72
Similar to the previous method but:-
(a) Cylinder drafted on its initial extrude
(b) New construction plane created so o-ring center hole is normal to surface
(c) 2 surfaces are split to create the o-ring sweep path
Happy CAD-ding,
Owen S.
Business Systems and Configuration Controller
HWM-Water Ltd1 -
alan_brunsman706
Is this the desired draft you are looking for? In the example from my previous document, I modified the sketch used for the remove sweep. If you activate the section view, you can see the draft angle.
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