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Sketching on a curved surface...help

Sketching on a curved surface...help

Sketching on a curved surface...help

(OP)
I am relatively new to this program and I need help!  I have an elliptical shaped sketch, which has been extruded.  This sketch has a radius on both sides.  The question is in regards to making a new sketch on the surface of the elliptical.  It does not like this.  My initial thought would be to do a 3D sketch, or create a plane that is parallel to the surface of where I want to sketch, but neither of these seem to work.  The 3D sketch makes the most sense to me, but if this is possible how can I build a relation in 3D?  Thanks

RE: Sketching on a curved surface...help

Check out the Wrap function.

cheers

RE: Sketching on a curved surface...help

What is it you want to accomplish with the sketch? There's always the possibility that you don't need to actually have the sketch on the surface of the extrude. Knowing what you're trying to accomplish would help to point you in the right direction.

Jeff Mirisola, CSWP
http://designsmarter.typepad.com/jeffs_blog
Dell M90, Core2 Duo
4GB RAM
Nvidia 3500M

RE: Sketching on a curved surface...help

(OP)
My end goal is to extrude a circular boss from the curved surface. Thanks  

RE: Sketching on a curved surface...help

Think the other way. Create a plane where you want the feature to end, place the sketch on it, and extrude Up to surface, selecting the curved surface.

cheers

RE: Sketching on a curved surface...help

Or, if the second extrude will be perpendicular to an existing plane, just place the sketch on said plane and extrude the needed distance.

Jeff Mirisola, CSWP
http://designsmarter.typepad.com/jeffs_blog
Dell M90, Core2 Duo
4GB RAM
Nvidia 3500M

RE: Sketching on a curved surface...help

(OP)
Thanks everyone I will post with the progress!  Cheers

RE: Sketching on a curved surface...help

Not to be a pain, but that will be almost impossible to mold (as-is).  But it looks like you got it to do what you needed--nice!

Jeff Mowry
www.industrialdesignhaus.com
Reason trumps all.  And awe transcends reason.

RE: Sketching on a curved surface...help

(OP)
Theophilus, if you don't mind me asking what would make this part difficult to mold?  Is it due to the extruded bosses or the width of material?  I was hoping to use a resin which is a little less brittle than a typical urethane resin.  Any suggestions would be great!  Thanks

RE: Sketching on a curved surface...help

Well, you've got the undercuts beneath the "barbs" on your posts.  Somehow you need to get the mold to pull apart without ripping off your barbs--and since there are two, you cannot pull in the simpler direction (from the sides of the part), but would need to pull sort of top/bottom--and you have the curls of the main part that get in the way.  It might not be quite enough room to do that.

You could consider a shut-off from behind the part up to the barbs, but you wouldn't be able to have fully-round barbs that way (without some fancy tricks).  Check it out.  (I could go into more detail, but it's tough with words and no models.)

Jeff Mowry
www.industrialdesignhaus.com
Reason trumps all.  And awe transcends reason.

RE: Sketching on a curved surface...help

(OP)
Thanks for the insight, I am learning everyday.  Design changes are already in the process.  Thanks!

RE: Sketching on a curved surface...help

Could you get away with just one post?
Or maybe join the two posts to create one obround post?
Or even have the posts vertical instead of horizontal?

cheers

RE: Sketching on a curved surface...help

(OP)
I believe the best option for my application would be a rectangular extrusion with a similar rectangular barb, condensing the two barbs into one.  If I am envisioning this correctly a potential mold could be pulled from the sides with less problem. Thanks

RE: Sketching on a curved surface...help

Yes, that's true--could simplify your mold substantially that way (and really reduce tooling costs).

Jeff Mowry
www.industrialdesignhaus.com
Reason trumps all.  And awe transcends reason.

RE: Sketching on a curved surface...help

If the barbed post can extend across the full face of the part, the part could then be extruded, which could end up being much cheaper than a moulded part. Even if the post cannot extend across the full face, the part could still be an extrusion; the ends of the post could be notched back.

cheers

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