Creating perfect circular dimple (cut) on a circular surface (ring)

Forum|Forum|13 years ago
June 6, 2013
3 replies
15405 views

I have a ring and on the surface of that ring I am trying to create a perfect cicle dimple cut. The problem is that since the surface I'm trying to cut into is circular the round dimple turns into an oval. Is there any way to make this feature so that looking down on the ring, this dimple looks like a perfect circle? Here is a picture of the ovular dimple on the ring.

Hopefully I've explained myself.

Thanks

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General

T

TomU

23-Emerald IV

I would think you could do the following:

1.) Extrude a cylindrical surface to represent the outer edge of the dimple that extends through the face of the ring.

2.) Use the intersect feature to create a curve where the cylindrical surface intersects the outside of the ring.

3.) Use the top edge of the surface, the intersect curve, and the center axis of the surface as references for a variable section sweep. Create the dimple surface using a conical shape.

4.) Copy and Move the surface

5.) Pattern as needed

6.) Solidify the initial moved copy

7.) Pattern the solidify

T

TomU

23-Emerald IV

I have created a part and uploaded it. You can download it here: http://communities.ptc.com/servlet/JiveServlet/downloadBody/3666-102-1-4658/pattern_dimple.prt.2.zip

You will need to drag the insert arrow back to the bottom of the feature tree. (The filesize is too large if the features are left resumed.)

T

TomU

23-Emerald IV

Screenshot

P

ptc-255508

1-Visitor

If its just an aesthetic feature you could;

- profect a circle onto the surface as a guide

- revolve an ellipse which you can then adjust till it matches the circle

- set the revolve axis horizontally in the above image and offset from the surface

T

TomD.inPDX

17-Peridot

There are ways but obviously the feature won't be a spherical dimple.

I might try a variable section sweep. you can project a circle onto the surface and use that as a trajectory. Take a look at the arc dropdown in the sketch, you can pick a conic from there for the profile that varies with the sweep, or you could enlist an ellipse.