Trying to make open irregular container

st_sh · December 12

Hi everyone,

I'm trying to build a container. This is my sketch:

https://cad.onshape.com/documents/d1562c583638f2639501b91d/w/26524bef232a3c8069f11d40/e/310bc66d5ac56dbc72169ddc?renderMode=0&uiState=675a90524a4a43331b88530a

I've achieved a black outline, and then I copied and edited the shape again and placed it within the original shape to achieve 1.2mm walls.

I'd like to extrude the outer shape first, then the inner shape to hollow it out but first I think I need to move the smaller (internal) shape 1.2mm away from the front plane, leaving a solid wall, and then extrude the inside to 1.2mm from the opposite side to achieve another wall there. I'm very new to this so I am not sure if I'm even on the right track.

Any advice would be appreciated. Thanks!

robert_scott_jr_ · December 12

I think your end result is to have a box with walls and bottom of 1.2mm thickness. If so, just extrude the entire sketch up 1.2mm and then use Extrude/Thin on one of the perimeter sketch shape entities. Which way (arrow selection) to direct the extrude depends on which perimeter you choose. - Scotty

jelte_steur814 · December 12

yeah: like robert said: use extrude/thin option.

or extrude the solid, and use shell afterwards. no need for offsetting wall in sketches. that works, but it's not vey flexible or easy.

st_sh · December 12

Thanks! I'll look at that option now. Did I go about this correctly? I spent a lot of time adding the inner boundary, but maybe I could have kept it a solid shape with a single line, and somehow converted it to a hollow object with constant wall thickness?

st_sh · December 12

Sorry, I misunderstood until I did it. It's perfect! Thank you

st_sh · December 12

One more question if you don't mind. I have completed the box but I don't know how to remove the top accurately. If I try to extrude/remove into the box it takes the walls off as well.

robert_scott_jr_ · December 13

The link you provided is view only so it's not possible to examine the feature tree to see what you have done to produce the results you have. Just glancing at the feature tree, it looks like there is an abundance of extrudes. If possible, please make your document Public so we can take a peek. - Scotty

st_sh · December 13

I just updated sharing to allow onshape users to copy etc.

MDesign · December 13

https://forum.onshape.com/discussion/comment/110899#Comment_110899

Not sure what your calling the top, but just select whatever face and extrude cut it through the box.

S1mon · December 13

This sort of part would probably be much easier to make with a shell feature at the end.

St_Sh_ · December 13

https://forum.onshape.com/discussion/comment/110940#Comment_110940

This is what I ended up doing, but the problem was that it shortened the part by 1.2mm. Not that this is a problem in my case, but I wondered how to do it perfectly in case I wanted to keep the height the same. I could have extruded/removed a rectangle from the top but since I used extrude/thin to make the item I didn't know how to select the inner top face (without selecting the walls all the way to the top).

St_Sh_ · December 13

https://forum.onshape.com/discussion/comment/110942#Comment_110942

Ooh, this would have been perfect. I didn't know about the shell feature but just read up on it and it seems like it would have been the right way to go. Next time!

MDesign · December 13

Here's a different way with less extrudes.

https://cad.onshape.com/documents/ac1c929bf8a0dd2ecdff6699/w/249e292c4166ef63d3dd4c03/e/f477868495f1214f15ecbecf

MDesign · December 13

https://forum.onshape.com/discussion/comment/110943#Comment_110943

You either have to cut a section to see in or set it to tranlucent like I did. then when you select the face…hover over it and press ` to get the pop up or right click and select other.