SPLIT SURFACES? PARTS? HOW TO

larry_hawes

Can't seem to find a way to split surfaces or parts to achieve a simple goal. Hopefully the video is not too confusing, but I would like end up with 2 parts, the outside shell and the inner piece which I can then thicken, or thicken first? Stumped...

Thanks

http://www.youtube.com/watch?v=R9TGpzOUtSw

https://cad.onshape.com/documents/8acf41d7601759a3aec23186/w/1d701d0a0218f280501c96e0/e/da4e430afcbd9255e092b2ba

bradley_sauln

@larry_hawes This is a great challenge and great questions. Thank you for including the video to talk through what you are looking for.

There are 2 things that you needed a little more information on but you are VERY close in your attempt.

First off with split. Since these are surfaces the part vs face split is a little confusing. You can perform a PART split on the surfaces so that you split the surfaces into 2 smaller surfaces. Face split technically also works but this makes it easier to follow and manage later on.

The second thing that was missing is understanding what a valid split is with Onshape. A valid split must fully cut through a component. Look at the following picture, the dark blue surface is not being fully split by the tool (light blue surface) you've selected.



I ended up modifying sketch two to make that line coincident with the corner so the lightgher blue surface fully and cleanly splits the darker blue surface. Rotating the model in your document should better show this and then looking at my solution here.




Here is my solution: https://cad.onshape.com/documents/83c2246b41f2bab81a670331/w/0c2116cd858bd587e5c377d6/e/b93d4c66e03c4fb704bedd5d

I want to make sure you fully understand how and why this works so feel free to ask follow up questions!

bradley_sauln

@larry_hawes This is a great challenge and great questions. Thank you for including the video to talk through what you are looking for.

There are 2 things that you needed a little more information on but you are VERY close in your attempt.

First off with split. Since these are surfaces the part vs face split is a little confusing. You can perform a PART split on the surfaces so that you split the surfaces into 2 smaller surfaces. Face split technically also works but this makes it easier to follow and manage later on.

The second thing that was missing is understanding what a valid split is with Onshape. A valid split must fully cut through a component. Look at the following picture, the dark blue surface is not being fully split by the tool (light blue surface) you've selected.



I ended up modifying sketch two to make that line coincident with the corner so the lightgher blue surface fully and cleanly splits the darker blue surface. Rotating the model in your document should better show this and then looking at my solution here.




Here is my solution: https://cad.onshape.com/documents/83c2246b41f2bab81a670331/w/0c2116cd858bd587e5c377d6/e/b93d4c66e03c4fb704bedd5d

I want to make sure you fully understand how and why this works so feel free to ask follow up questions!

larry_hawes

Thank you Bradley for the clear explanation. I had a feeling that sketch 2 was not placed/constrained correctly but I was under the false impression that PARTS were PARTS and SURFACES were SURFACES and never the twain shall meet.

"Since these are surfaces the part vs face split is a little confusing." Indeed, when splitting surfaces using the PART split tool even though there are no PARTS, only SURFACES, the command is truly a bit downright confusing. It became quite easy with Sketch 2 corrected and using PART split on the SURFACES. Learned a valuable tool but it does seem a confusing tool combination..

Thanks again.

larry_hawes

...and splitting faces (which seems logical since they are surfaces) is not the preferred or an optional method why? Looks like that works but neither method works with Sketch 2 not coincident.

larry_hawes

Hopefully the accepted answer leaves room for another challenge within the same document, if not I'll post a new thread.

Video should be clear and again I'm missing a simple tool I am sure...

http://www.youtube.com/watch?v=hKSwB41V3Yo

https://cad.onshape.com/documents/8acf41d7601759a3aec23186/w/1d701d0a0218f280501c96e0/e/da4e430afcbd9255e092b2ba

bruce_williams

Good exercise @larry_hawes and thanks for explanation @bradley_sauln

Larry - I saw you were trying thicken and that does not give correct edges.  Here is an example using Boolean plus 1 FS, Enclose, and Shell.

larry_hawes

Nice Bruce, don't understand the Boolean Plus 1 FS, where to find it, or how to insert it, but it seems to be the tool I was looking for. So nice to see such different approaches, very helpful. Is the Boolean Plus FS ready for prime time? Couldn't seem to find/insert in to my docs?

bruce_williams

In Add Custom Features - Community Spotlight - search for 'boolean' and it comes up as Boolean Plus Surfaces

larry_hawes

VERY nice, thank you.