tricky product to model

[grantpoadhindle]

Hello all ,

I've got a stamping to model with a shell pattern …….I'm looking work flows to model the attached

Thanks in advance

[TheCADWhisperer]

File>Export and then Attach your *.f3d initial attempt here.

[grantpoadhindle]

please see attached

[TheCADWhisperer]

Blue lines should keep you awake at night.

I would start by editing Sketch1 such that the center of the R30.7828142 arc is at the Origin and the entire sketch is fully defined. 

Your images are all at angles.

I would take photos orthogonal to the part (against a neutral background like orange or green or plain white sheet of paper, place in canvas and scale to 1:1 (as close as possible, considering parallax error - to use as reference).

[Beyondforce · Accepted solution]

Hey @grantpoadhindle ,

Here you go, I hope it helps:

[grantpoadhindle]

Thanks Beyondforce  …… that's a great solution..... I will have a play around with it and post my results 🙂

[Beyondforce]

Great, I'm glad I could help 👍

[laughingcreek · Accepted solution]

if you want that smooth transition at the base then there is probably some surfacing work in your future.  Attached is a quick example (but it's also a sloppy model, don't emulate all my bad habits!)

I wouldn't consider this a beginner approach.  but look through the time line and see if it gives you ideas.

[grantpoadhindle]

Thankyou for looking 😀

[grantpoadhindle]

Thank you very much that's great !

[chrisplyler]

I just want to throw out that the part pictured looks suspiciously like a casting, not a stamping.

[TheCADWhisperer]

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@chrisplyler wrote:

I just want to throw out that the part pictured looks suspiciously like a casting, not a stamping.

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...and true fidelity might require just a bit more effort...

[grantpoadhindle]

@TheCADWhisperer @chrisplyler ….

Guys …. the process the pull is made by is what we in the uk call a hot brass stamping.

I know some of the process names are slightly different between the USA and UK sometimes.

anyway ...

I'm getting some nice results with the lofting workflow , I've boundary filled the surfaces to make a solid but I'm having trouble shelling the solid... see attached

[wersy]

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@grantpoadhindle  schrieb:

@TheCADWhisperer @chrisplyler ….

Guys …. the process the pull is made by is what we in the uk call a hot brass stamping.

I know some of the process names are slightly different between the USA and UK sometimes.

anyway ...

I'm getting some nice results with the lofting workflow , I've boundary filled the surfaces to make a solid but I'm having trouble shelling the solid... see attached

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But you can thicken the shell.

[laughingcreek]

It's looking good indeed.  a couple of comments -

-fix those yellow errors AS YOU GO.  otherwise your working off cached geometry and all sorts of weird things can happen.  it's not really worth trying anything else till those are fixed, particularly the loft.

-lots of things effect fusions ability to shell/offset/thicken (they're all related under the hood). One is the presence of near tangency  conditions.  in your second loft you didn't insure that the surface from the first loft had a smooth transition to the second loft, so there is a near tangency condition there.  in my testing I found that limited the shelling of that surface to 1 mm and failed above that.  it's going to take a little work to fix this.

Another thing that effects shelling/thickening/offsetting is geometry that folds onto itself and kinks.  the last valley at the sides of the shell have a curvature that eventually fold onto itself.  you can fix that thru trial and error, adjusting the curve out till it will thick enough for the purposes (that looks like 3 mm).  right now it's failing above 2.2 mm, so it's close.

[grantpoadhindle]

Thanks @laughingcreek  very good of you to take the time to look at this.

with regard to the thicken workflow failing ….that's why I was trying to shell the solid ...

maybe if I fix the yellow errors it may work for me.....I will keep plugging away.

thanks to all  @wersy @TheCADWhisperer @chrisplyler @Beyondforce for assistance ..what a great forum 🙂

[grantpoadhindle]

Got it near enough eventually …. 🙂 ….thanks again

@laughingcreek @wersy @TheCADWhisperer @chrisplyler @Beyondforce 

[Beyondforce]

Nice work my friend! 👍

[laughingcreek]

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@grantpoadhindle wrote:

...with regard to the thicken workflow failing ….that's why I was trying to shell the solid ...

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Not sure you understood the point.  If a surface won't thicken, then a solid later made from that surface won't shell.  i wasn't suggesting you use thicken instead of shell.  By going back in the timeline and testing surfaces at earlier stages by thickening them, you can get a pretty good idea if those surfaces will later cause a shell operation to fail.  what I showed you was 2 locations in your model that were causing the shell feature to fail.

your current model is probably good enough.  later on if you decide that the slight crease in the bottom bowl area is offensive you will at least have some notion of how to go back and fix it.