How to create a cornet. 1

• Nov 9, 2010

• #2

btrueblood

Mechanical

May 26, 2004

9,897

"Easy to make one from paper"

Do you mean to make a cone?

Or the bell end of a trumpet (cornet)?

Both are bodies or shells of revolution...hint hint.

 

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• Nov 9, 2010

• Thread starter
• #3

hoiro

Mechanical

Nov 9, 2010

4

Hello btrueblood,

I mean none of the above. A cone is simple, but I want to make something like the picture attached.

Hope you can help me.

Thanks!
Robert.

 

 http://files.engineering.com/getfile.aspx?folder=79716dc4-5268-4190-a7ed-b8c6da910481&file=cornet.jpg

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• Nov 9, 2010

• #4

btrueblood

Mechanical

May 26, 2004

9,897

Looks conical to me...

Are you trying to model the folded seam along one or two edges? Or the non-perpendicular trim at the open end of the cone?

If the former, I'd think you could sketch the form of the ends you want and use a loft to join the sections.

 

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• Nov 9, 2010

• #5

CorBlimeyLimey

Mechanical

Nov 5, 2003

15,292

Can you loft from a sketch of the open end profile on an angled surface, to a point?

 

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• Nov 10, 2010

1
• #6

rollupswx

Mechanical

Dec 31, 2007

918

Looks easy enough - can you attach what you have tried so far?

 

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• Nov 11, 2010

• Thread starter
• #7

hoiro

Mechanical

Nov 9, 2010

4

Hello btrueblood,

I want to make the conical shape exactly like the pictures attached to this reply. Eventually I want to make the conical shape from 3 mm thick lether. The scribbled lines are the stitches through the two layers of lether.

Hope you can help me.
Robert.

http://files.engineering.com/getfil...-4e9b-a4a3-7a37d588f057&file=Flat_pattern.JPG

http://files.engineering.com/getfil...4611-8606-1f8737ba919d&file=Conical_shape.JPG

 

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• Nov 11, 2010

• #8

rollupswx

Mechanical

Dec 31, 2007

918

Looks easy enough. Can you attach ipt of what you have tried so far?

 

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• Nov 11, 2010

• #9

btrueblood

Mechanical

May 26, 2004

9,897

Hoiro,

I think you may be asking too much of the software, i.e. if you want Inventor to take the shape of the 3d (rolled) cornet, and "unroll" it to a flat pattern, or vice versa, it may not do it very well. Or, it might, but you will need to spend a lot of time defining the bend lines for it to make many, many tiny bends until it gets the shape sort-of like you want.

And I will likely be proven wrong in my statements above by some much more clever people than me who use Inventor in some very strange and mysterious ways...

If you want to just make a model that reasonably mimics the shape of the formed (rolled) cornet, then use the loft commands.

 

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• Nov 13, 2010

• #10

rollupswx

Mechanical

Dec 31, 2007

918

Did you give up on this one? Looks like with the correct trimming it should be fairly easy. Do you have some dimensions?

 

 http://files.engineering.com/getfile.aspx?folder=6ad9832f-faa7-41cd-b0ef-b38805e0e0a6&file=Cone.jpg

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• Nov 15, 2010

• #11

btrueblood

Mechanical

May 26, 2004

9,897

...and there ya go! Star for rollup.

 

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• Nov 16, 2010

• Thread starter
• #12

hoiro

Mechanical

Nov 9, 2010

4

Thanks btrueblood and Rollupswx!

I guess it is possible to make a model with autodesk Inventor, but it will not be same as the real thing. If you, for example, look at the top of the cone in the attached picture posted earlier in this threat. This specific shape it hard to approach.

Is there no function with which you can bend a sheet metal around a certain line of shape outside the sheet metal?

Anyway, the dimensions are 3 mm thich material, 'short side of the cone' = 11cm, 'long side of the cone'= 16cm.

Hope you can send me an ipt-file!

Thanks!
Robert.

 

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• Nov 16, 2010

• #13

rollupswx

Mechanical

Dec 31, 2007

918

Hope you can send me an ipt-file!

Click to expand...

Attach here what you have completed so far. Are you familiar with 3D sketches and wrapping 2D sketches?

 

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• Nov 16, 2010

• #14

rollupswx

Mechanical

Dec 31, 2007

918

I was hoping for some minimal information before spending the time to nail it down.

So many times I hear, "but that isn't really what I want" after I spent significant time on someone else's problem.

A traditional hand drawn top, front and r.side with dimensions and scanned or photographed with a cell phone would be a good start. An Inventor file would be better.

 

 http://files.engineering.com/getfile.aspx?folder=2f790ea7-c8c9-4243-8faf-35e8929ceaea&file=Cone_Dims.png

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