Inventor General Discussion

Inventor General Discussion

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kmteh
Posts: 4
Registered: ‎10-18-2007
Message 1 of 9 (1,697 Views)

How to unfold taper cylinder?

1697 Views, 8 Replies
08-31-2010 02:20 AM

Hi Expert

 

May I how how do I unfold /flatten this taper cylinder to 2D view for CNC programming?

Please advise also if MDT 2009 has the function to do this. If not how can I do it with Autodesk Inventor.

 

Many Thanks.

 

Regards

 

KM  

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JDMather
Posts: 28,254
Registered: ‎04-20-2006
Message 2 of 9 (1,687 Views)

Re: How to unfold taper cylinder?

08-31-2010 04:20 AM in reply to: kmteh

You will need to model as 3 parts (5 total if the ends are not the same) in Inventor.

 

MDT does not have sheet metal functionality.

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johnteng00
Posts: 97
Registered: ‎03-19-2007
Message 3 of 9 (1,591 Views)

Re: How to unfold taper cylinder?

09-16-2010 07:03 AM in reply to: kmteh

hi guys,

 

here is the solution:

a. download smartunfold from solid3dtech.com

b. explode the solid into surfaces.

c. using smartunfold to unfold each piecese.

 

any problems, just ask for support from solid3dtech.

john

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JDMather
Posts: 28,254
Registered: ‎04-20-2006
Message 4 of 9 (1,574 Views)

Re: How to unfold taper cylinder?

09-16-2010 07:50 AM in reply to: johnteng00

Don't need any third party software. 

Inventor will handle this problem just fine.

 

Just for fun - post your solution to the problem.

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BMiller63
Posts: 2,533
Registered: ‎01-28-2009
Message 5 of 9 (1,564 Views)

Re: How to unfold taper cylinder?

09-16-2010 08:02 AM in reply to: kmteh

See attached examples.

These are both modeled as a single part and will produce a flat pattern.

The variations are how the holes are handled (probably only one is correct, but I provide both for comparison)

These files are Inventor 2010 files.

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JDMather
Posts: 28,254
Registered: ‎04-20-2006
Message 6 of 9 (1,554 Views)

Re: How to unfold taper cylinder?

09-16-2010 08:21 AM in reply to: BMiller63

Don't look like valid solutions to me.

Measure flat.
Measure loop at smaller cylinder.  More than 2.75 difference in circumference layed flat?

 

Might stretch the larger cylinders from that flat, but compress the smaller?

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BMiller63
Posts: 2,533
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Message 7 of 9 (1,539 Views)

Re: How to unfold taper cylinder?

09-16-2010 08:57 AM in reply to: JDMather

JD,

I don't claim them to be accurate to a certain forming/manufacturing process (none of that information was provided), but I think the 2.75" is because of the forming method used. I just used the default Unroll Method of Centroid Cylinder, using the Developed Length option is probably the more realistic way to go?

 

Feel free to offer suggestions on which method would be best (based off of your experince), I was just offering a modeling method. In real life, I'd have to have a conversation with whomever I was going to source this with, before creating anything accurate.

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JDMather
Posts: 28,254
Registered: ‎04-20-2006
Message 8 of 9 (1,519 Views)

Re: How to unfold taper cylinder?

09-16-2010 09:11 AM in reply to: BMiller63

To me this is an Inventor fantasy part when created using Contoured Roll feature.

Others have pointed out similar fantasies.

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BMiller63
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Registered: ‎01-28-2009
Message 9 of 9 (1,511 Views)

Re: How to unfold taper cylinder?

09-16-2010 09:29 AM in reply to: JDMather

 


JDMather wrote:

To me this is an Inventor fantasy part when created using Contoured Roll feature.

Others have pointed out similar fantasies.


 

it very well could be, again in real life I'd find that out when I spoke to a forming house and they said: "yeah, right! We can't do this." or "Well, we can do it, but we'll have to build some tooling, how many of these are you going to need made?"

 

It's that last part that often sends us back to the drawing board. A quote that includes custom tooling may be worth it if we're needing 10,000 pcs, but not for just 100 pcs.

 

I've sent some Inventor fantasy parts out for quote, and see no shame in doing so. There are many manufacturing processes that I have only a general understanding of, that I deal with on only a semi-regular basis. In those cases, I speak with vendors, they make suggestions, etc. Most often, if I can give them a drawing from a model like the one I've posted here, they'll use it to move forward, but the released revision model and drawing come from an "as built".

 

Of course that's not the way we were taught that it works when we were in school, but that's how it often works in real life!

 

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