A design contest again...

emagdalenaC2i

The contest as usual is to design this part with the least number of features:

Rules:

- Precision 0.1 mm
- The Part is symmetrical

Bonus:
- Create this drawing with only 1 view (plus isometric views)

The best answers will be marked as accepted answers ;-)

Good luck  

BenTaylor

Best I could do was 5 features - that "chamfer" is tricky

jon_sorrells

https://cad.onshape.com/documents/c02df21084b34739688ca657/w/04eb412c608143f200c83401/e/c9f34603532b51c4544b6a3f

The chamfer is not the same all the way around, but it's still within the 0.1mm tolerance.

Saved a couple features by doing extrude intersect with draft from the same sketch, to move the bottom face back and do the chamfer at the same time.

Alex_Kempen

So, nobody said FeatureScript wasn't allowed...

https://cad.onshape.com/documents/eebb66e5a6139b9b86708957/w/093d288d7231f660efc44c25/e/442d6999fa2e78f6d076b67d

emagdalenaC2i

I can't open your document... and, No.. FeatureScript and derive feature are not allowed 

BenTaylor

Best I could do was 5 features - that "chamfer" is tricky

emagdalenaC2i

@BenTaylor Yes, I know 
I did it in 5 features too.
Please, share your document if you want to win the contest

emagdalenaC2i

Here is a different approach

https://cad.onshape.com/documents/2db9c560fc4f7bcb3d8143d4/w/60bee1191db830d3df0f13ee/e/1219082eaa5dd746f33ab789

jon_sorrells

https://cad.onshape.com/documents/c02df21084b34739688ca657/w/04eb412c608143f200c83401/e/c9f34603532b51c4544b6a3f

The chamfer is not the same all the way around, but it's still within the 0.1mm tolerance.

Saved a couple features by doing extrude intersect with draft from the same sketch, to move the bottom face back and do the chamfer at the same time.

bruce_williams

wow!  nicely played @jon_sorrells

follow up question for group - how would this be manufactured? Being a patternmaker, I see a sand or investment casting.  Course the material is not spec'ed. 

tim_hess427

Maybe this process can scale up!

pasta macaroni extruder machine made in China - YouTube

matthew_stacy

Holy macaroni @tim_hess427!  That pasta machine is fabulous.  But how do we chamfer the ends of each noodle?  And how do they keep the noodles from sticking to each other????  Magic.

StephenG

If the goal is to create part geometry that will reproduce the supplied drawing then only 3 features are necessary.





A simple equal distance chamfer gets the job done.


If a "perfect" 2 mm x 2 mm chamfer is required all around the edges of the "pasta tube" then lofting will be required. Fortunately, the pasta I consume has no such requirement.

emagdalenaC2i

@StephenG you forgot about the height (dimension of 38mm).
That is why a simple chamfer is not used

StephenG

Opps. Had to add an additional feature to get the 38 dimension. 

Needed 4 features to recreate your drawing.


This was more of a design/drafting puzzle than a design modeling contest. Note: Still used a simple chamfer feature.

matthew_stacy

@emagdalenaC2i , when the dust settles I hope that you will share your secret to "Create this drawing with only 1 view (plus isometric views)".  I created a named section view in the Part Studio, but apparently these can't be inserted into drawings yet.

So how did you create a section view in the drawing without first placing a parent view to derive it from?  Inquiring minds want to know.

emagdalenaC2i

matthew_stacy

@emagdalenaC2i, thanks for the lesson on Broken-Out-Section-View.  That's a handy tool.

StephenG

High precision pasta. Cooked up via lofting.

(Of course the feature count went way up: replaced a simple single chamfer feature with 2 additional sketches, a loft, and 2 mirror features.

Comments:
Provided contest drawing is ambiguous. The 15 and 22,3 dimensions are linear dimensions, therefore the shape of rotated profile(s) are not truly known. The included shaded ISO views gives the impression the profile(s) are simple circles, but ellipses with slightly different major and minor diameters of could have been used to produce an equivalent "section view".    

One of the rules state "The Part is symmetrical". But symmetrical with or about what? 

The 2 mm dimensions are open for interpretation relative to what happens around the edge. Think a simple note with a leader is a better way to communicate what is needed.

  

Clever use of the "Broken-out section" function to create what appears to be a section view, but without a parent view and associated section cut line it is not a true section view. However, it was never said it was a section view, so I was fooled. However, you still used another view to set the cut depth, that makes 2 views are required. It is possible to define the cut depth using "blind" option with a keyed in value; that would make the drawing possible with only 1 view. It is also possible to create a drawing sheet showing just a true section view and not its parent, by moving the parent view to another sheet.

Interesting puzzle to work on and I learned some things.   

Confession:
Loft is not a perfect 2x2 all around (only used 3 profiles in the loft). Section cut at 90 degrees (Section B-B) looks very close. but at +-45 degrees (Sections C-C and D-D) things kind of wander a little. I am sure this can be improved with additional section profiles and possibly guide curves.