Parameters of G2 curvature Continouity Radius

Parameters of G2 curvature Continouity Radius

busycleta
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Parameters of G2 curvature Continouity Radius

busycleta
Advocate
Advocate

 

Dear Community

 

I have this Part here and on the drawing, I'd like to point out the mathematical Paramterization of the R5 G2 continuous Radius.

 

busycleta_0-1629466123874.png

 

BackGround:
Profile Manufacturers sometimes "re-program" the 2D Section of a profile.

 

Is there Any Idea on how I could achieve this, or create a "call out" thereof in the drawing?

 

busycleta_1-1629466220895.png

 

 

Part
https://a360.co/3B2ccX5

 

 

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Message 2 of 7

TrippyLighting
Consultant
Consultant

No, because it makes little sense. You also forgot to include the tangency weight, which I believe might be application specific. I'll have to ask someone from the Fusion 360 team if that is true, or verify with other applications.

The "curve" of that radius is based on a 5 -degree spline with 6 CVs. It has variable curvature.


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Message 3 of 7

ClintBrown3D
Autodesk
Autodesk

Hi @busycleta 

 

In terns of documenting it on the drawing, if you use the "note tool", you can add in a manual call out, as shown below.

2021-08-21_09h07_28.gif


Clint Brown
Senior Product Manager - Autodesk Fusion



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Message 4 of 7

TrippyLighting
Consultant
Consultant

I had to dig a little more to find a good example of how to properly dimension free form surfaces/curves.

I've seen many examples of this when working in the automotive industry, but usually, the information on those drawings is highly proprietary, so cannot be shared.

 

However, I did remember an excellent example from the Apple Accessory Design Guidelines, which are public domain. Here is a screenshot of the fillet dimensioning of an iPhone 12 Pro Max (Page 171):

 

 

Screen Shot 2021-08-21 at 10.32.42 AM.png

 


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Message 5 of 7

busycleta
Advocate
Advocate

Hi , thanks for your input,

 

In my example screenshot you can see that tangency weight is set to 1, I will also check how the analytical formulation of the G2 "Radius" is usually noted down in a human readable form.

 

Best Greetings

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Message 6 of 7

ClintBrown3D
Autodesk
Autodesk

Hey @TrippyLighting 


Thanks for sharing, yes the reason they detail the G2 curves like that, is that they are tangent splines, not radii.

 

This is pretty easy to do in Fusion, I made a quick video to show the workflow.

 

 

@busycleta I hope this gets you a bit closer to what you need.


Clint Brown
Senior Product Manager - Autodesk Fusion



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Message 7 of 7

busycleta
Advocate
Advocate

 

This is great work, thanks for pointing out the details on how to realize on a drawing.

 

I might have to use this workflow as well.

 

What I originally wanted is the analytical description of that G2 Spline so the mafacturere of the profile can somehow program that into his CNC. Some Kinde of instruction, where he can work out the G-Code From that.

 

Best Greetings

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