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Won't shell because of certain curves?
wander_kars
Member Posts: 6 ✭
Hey,
I'm a green newb to OnShape, I started this year but I'm having so much fun, in combination with the 3dprinter. I've made some repairs at home, designed toys with my 8y son (TinkerCad) and designed boxes for tools. My problem concerns the latter.
I want to shell out this inlay with a wall thickness of 2mm. It shells, but with a max wall thickness of 0.3mm… Sometimes it's a set of fillets ('Innerfillet') which I could maybe solve by adding them later. But the real problem are my 'fancy' loft connection in the wrench and the oval part of the screwdriver ('schroevendraaier'). Since these shapes don't appear overly weird to me, I don't get why they cause this problem. But I'm new, so is my scope of what can go wrong with shelling.
I've tried to reconstrict them more tidey, use separate chamfers or fillets, resketch the parts on a separate plane, recreating the loft or sketches for the loft or planes for the sketches of the loft., rearrange the features, made them as new parts and then boolean cut them out. Every try I'm getting less convinced that'll do the job. Cause it's always the same problem with two points on the face I use for the loft (which hits the handle), ánd the revolved oval part on the screwdriver. I'm on this for 3 nights now, this is getting ridiculous because I'm not designing a rocket engine. It is just a box with some removed revolved/lofted shapes. Could someone please explain the logic behind this? I really want to understand this. And a solution would be awesome too, but first the logic (also because it isn't very specific why these areas won't work, it's just… error red).
Best Answer
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rick_randall
Member Posts: 382 ✭✭✭
@wander_kars - You may already know this, but the "shell" command is sensitive to two conditions - 1) self intersecting curves and, 2) non-manifold bodies. Small radii are usually the culprits for failure in both cases - If you can, shell first then add fillets. Fillets larger than the shell thickness won't be a problem. Once you understand this, "shell" is almost bulletproof. Good luck, and keep at it.
0
Answers
A picture is worth a 1000 words (and view only link is even better!)
Sooooo I fixed it in 5min after posting my question. It appeared the shell function was in the wrong direction all the time (?!). So i'm sorry for posting, but I'm also sort of happy now.
Still, the link (I sadly also forgot to add to my post):
https://cad.onshape.com/documents/1e3da4ace7bd5205263d789c/w/83af4bb3ac69954c4f7f0fcd/e/f3a3d0817003d00d3b872e6f
I will be back with a question, no worries. There are still features to conquer and mistakes to be made. Thanks in advance!
Oh, im sorry! Apparently my next post didn't come through! I literally found out the problem 5min after posting the question. Obviously, lol! It appeared I changed the direction of the shell (i thought i removed/reapplied it several times and also played with the direction, but i didn't?). Anyhow, I made it work! Thanks for the quick reply tho! I'm sure I'll need you in the future, cause I'm not done playing, learning, fixing… and shelling.
I made a mess of the project while playing with this problem, but I will make it clean again, fillet some stuff and then finally print it.
https://cad.onshape.com/documents/1e3da4ace7bd5205263d789c/w/83af4bb3ac69954c4f7f0fcd/e/f3a3d0817003d00d3b872e6f
@wander_kars - You may already know this, but the "shell" command is sensitive to two conditions - 1) self intersecting curves and, 2) non-manifold bodies. Small radii are usually the culprits for failure in both cases - If you can, shell first then add fillets. Fillets larger than the shell thickness won't be a problem. Once you understand this, "shell" is almost bulletproof. Good luck, and keep at it.
Ok: 3rd try commenting back.., other replies got blocked I think.
So I found out what was wrong, just a few minutes after placing the question (obviously, lol). Don't laugh, I apparently flicked the direction of the shell. I'm sure I fiddled with it to fix the problem, but since it must've been a multilayered problem which has been solved accidentaly while troubleshooting I just lost track of all the things I had changed. Still kinda flabbergasted it's just that tho… I'm trying to put the link here but. robots.txt doesn't allow acces to the url. Anyhow, you can find it under: 'Ratel inlay ding'.
Thanks for the reply @GregBrown. I'm sure I will need your help in the future. Once I found out the next challenge: How to post the project link over here. I'm going to clean the project, fillet some stuff and finally get to printing it.