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I am using an Autodesk Inventor Version.10 for our mechanical design. I need to have some information’s about a particular functionality to be done via Inventor.

We are working in a mechanical product design, and it involves number of components to be assembled together to get the overall product assembly. In the initial phase, we are not quiet sure about the all the individual componential tolerances, and thereby its influences on the total assembly chain tolerances. Because false interpretation of individual tolerances will have the effect of Collision, mis-match, failure rates etc…

To figure it out, we are in need to have a functionality in Inventor for the automatic generation of optimal tolerance values for each and every component in an assembly on the basis of...

1)    Given - Allowable upper and lower limit of the total Linear chain Length

2) Material Properties of the each and every component with Heat Expansion  Co-efficient with defined operating temperatures. Because the selected tolerances will subjected to changes on the overall chain length

As I understand, In Inventor Version 10, we don’t have these kinds of optimisation capabilities for automatic generation of tolerance values on each component on the basis of Upper/Lower limits of the dimensional chain.

May be, there is some other calculation program to do this with the interface of Inventor. If you know any of those program , please let me know.

Moreover, if you have these kind of possibility in the higher version of Inventor (Version. 11 and so on ). Please let me know.

I hope you got an overall picture, what we would like to do?

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You can include tolerance values in the linear measures in every part and drawing.

But it is impossible to automatically calculate the "optimal" tolerance values. Not in Inventor 10, not in Inventor 2009 and not in any other CAD-system I know.

That's for a simple reason: How should a software guess what you want? It's just not possible for a computer-program to find tolerance alues that will work in your design.

I'm sorry.

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Cheers,
    Jochen

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Hi Jochen ,

Thanks for the quick reply. Including  the tolerances in the drawing and linear chain comes the next part.

First of all; I have developed or designed all the required individual parts wiht Nominal Dimesional values for the designated application. Inorder to assemble all the parts together, I am in need of right tolerances for all the parts to make it as a finished one.  I cant assume a rough value in the initial stage. So, I need to have some sort of guiding procedures or a functionality to do this.

I will input my values like  Overall chain length with upper and lower allowable tolerances, operating temperature of the assembly and material. Then the functionality should generate a tolerance combination by a  statistical or an arithmetical appraoch. We can validate this generated one with respect to manufacturing aspects.

I need something like "Konstruktion Assistent" in inventor. you are inputting some paramters, its generates the corresponding component.

As you have mentioned, we dont have these possibilites in Invnetor. But I am not quiet sure if this is the case for all the CAD softwares. I have seen one calculation program from MITcalc for Tolerance analysis for 1d,2d,3d chains.
check out  www.mitcalc.com.  The have lot of porgram in excel interfaced with Inventor. Butunfortunately, this tolerance program cant have the control over the paramters in the models in Invnetor..

So, i thought if we have this things directly in Invnetor or other cad programs, it would be nice.

Bye

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Yes, your´e right. This would be nice. But for the time being there´s no tool that implements this functionality.

So You have zo stick to the Excel-Sheets and introduce the dimension into Inventor manually. Or You can link Inventor parameters to the (embedded) excel sheet to drive these parameters.

Best way would be a skeleton-modeling approach driven by your Excel calculation.

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Der vernünftige Mensch paßt sich der Welt an;
der unvernünftige besteht auf dem Versuch, die Welt sich anzupassen.

Deshalb hängt aller Fortschritt vom unvernünftigen Menschen ab.
(George Bernard Shaw)

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Toleranzberechnung2009.PNG

From Konstruktions-Assistent R2009, not much though...
It can also generate a nice litte report in html.

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Grüße von Harry

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Hi!

Best would be, to design in a way that tolerances have less influence.

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Roland  
www.Das-Entwicklungsbuero.de

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Hello,

for your requirements there is a software "Tolerance designer" available. For information follow this link:
http://www.teq.de/teq/en/software/software.htm 

For further information please contact Dr. Christian Beck at TEQ

Best Regards

Mathias

[Diese Nachricht wurde von matze_p am 30. Okt. 2008 editiert.]

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