# Thread: simple problem creating depression in surface

1. ## simple problem creating depression in surface

This has got to be ridiculously simple, I'm just stumped how to do it. I've got an oval shape sketched on the top side of a solid surface. How to I cut out the oval into the solid like a bathtub. Where all the cut surfaces are basically rounded.

2. if the hole is just an oval body, with nothing else, then a revolute cut would do the trick.

if its a complex shape you could model the volume to be removed as a solid model, then use a binary operation to subtract it from the stock.

3. Ah, well you give me too much credit regarding my knowledge of Solidworks. What would the step by step method be for completing a revolute cut ?

4. Can you describe the shape you're wanting to cut a little better? Is it decorative as in just for show on a CAD model representation of your house, or is it functional, will you want to make this for real?

Also is it a perfectsemi circle shape of the oval you are removing from the top surface? or is it like the bath I've just got out of and goes down a way and then starts to curve in? Curves in SolidWorks are called Fillets )

So your two options from the outset are a standard "Extrude-Cut" down to the right depth and then use a Fillet option to curve the bottom of the bath, and a second fillet at the top would probably be a nice visual effect too.

Otherwise if it is just a perfect revolute (thanks Daedalus that was a perfect introduction of such an underused word) then use a "Revolve-Cut" you might have to go hunting for the button in your drop-down menus. Oh and still fillet the top as in pictures it picks up the light nicely and in manufacture a radius is easier to remove from the mould, and getting into the bath, well its better not to have sharp edges ;o)

Let us know how you get on, and post up a picture of your bath (just please don't be in it)

J

• ## bathtub

The "bathtub" will be milled in copper, it's actually a native art form that is often carved. Because it's organic in shape the lines are irregular and the dimensions are not important, other than the depth. The bath cannot go deeper than half way through the stock.

I tried a revolute cut but the depression went too deep; the oval is too wide and a revolute cuts the same depth as the width of the oval. I tried a sweep cut with a series of profiles but they intersect themselves. The only thing that comes close is a loft from the oval on the surface down to a smaller oval on the mid plane but that leaves a small flat oval on the floor which is not right. The floor should be completely curved. (see the pic).

Perhaps I need to construct geometry for the bath shape and then cut with surfaces or extrusions.

• Can you express an ideal shape of the cut out from the side?

J

• can you post a photo of the artwork you are planning to copy? Is this just forming a decorative engraving on the surface of a part?

There are many ways of solving this, but without seeing the artwork its hard to tell which will be easiest.

• ## native art bathtub

Here's a few pictures of the art piece that will be milled in copper. The work is basically a series of complicated contoured surfaces (carved). The form lines are all free form; the walls and floors of the cavities all curved and angled.

I found the "Dome" feature and applied it to the bathtub oval problem. I reversed the action which acted like a cut and created a smooth contour; more what I had in mind. Would there be another way, I was thinking perhaps the "Shape" feature. I'm using 2004 version which does not seem to have the "Indent" tool which might work as well.

• Hi, sounds like you have solved your modelling problem, and looking at the part it would be a pain to model the way I was thinking.

On something like that it might be worth considering outsourcing to someone with a 3d laser scanner, as you will save a lot of time and effort that way, and get a more authentic looking model.

The copies of this in copper, are you making lots of them? are they just copper for appearances sake?

The reason I ask is the last carved part I had to replicate I used an epoxy resin casting method, and it gives very nice detail. Now i assume you can load epoxy with copper powder filler to give the color / appearance your after. Its not exactly a production process, but its really easy for low quantities.

• Copper is a traditional material, used by the natives in rough form before first contact by the Europeans. We considered using molds but it's difficult to get clean edges that replicate carved surfaces, and copper is difficult to cast. Appreciate the input !!