Creating a gentle funnel out of a surface?

nick_brooks

I'm a beginner trying to create essentially a simple box with a spout in it to drain liquid. I've got this far (pic) with sketches, extrudes and transforms, but I'm hitting a brick wall trying to find a way to make the "inside bottom" surface curve smoothly down toward the spout.

I guess what i'm looking for is a way to distort a surface down in a "funnel" sort of way (i.e. highest at the four corners and lowest at a point that I define). Is there a simple way (or any way) to do that? 

mahir

Lots of ways to do this. Here's my take. It uses a two-stage loft between 3 profiles.Lofting Sketch1-to-Sketch2 hollows out the "box". Lofting Sketch3-to-Sketch4 makes the spout.

https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/ea9d733c17dbd650b65c9236

fastwayjim

I think the best way to do that is a loft feature. Create two sketches, the "top" and the "bottom" of the funnel, and then create a loft, and remove it from the existing "inside bottom" of your current model. If you share the geometry with me, I can show you.

mahir

Lots of ways to do this. Here's my take. It uses a two-stage loft between 3 profiles.Lofting Sketch1-to-Sketch2 hollows out the "box". Lofting Sketch3-to-Sketch4 makes the spout.

https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/ea9d733c17dbd650b65c9236

Tony_C_

I like a good challenge. 

When you make you funnel you can use guides in your loft to really shape how you want it to flow.

https://cad.onshape.com/documents/61cdaced1aada6c2cfc602ef/v/1eb6a49b34d244abaf12ad9b/e/359c0cd185cbed1faf230a0f

Tony_C_

mahir said:

Lots of ways to do this. Here's my take. It uses a two-stage loft between 3 profiles.Lofting Sketch1-to-Sketch2 hollows out the "box". Lofting Sketch3-to-Sketch4 makes the spout.

https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/ea9d733c17dbd650b65c9236

One thing about OS.....It is really interesting to be able to see how someone else tackles making the same thing.  And what you can learn from it.

I've never played around with loft end conditions....Gonna have to look into that a bit more. 

mahir

Yep, end conditions are handy when you want some control over your loft shape, but you don't necessarily need a specific shape provided by a guide curve.