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Valued Contributor
mjkelly
Posts: 97
Registered: ‎12-10-2003
Message 1 of 7 (100 Views)

Positional Reps & Flexibility tutorial

100 Views, 6 Replies
08-20-2004 08:37 AM
Is there a tutorial which explains positional reps and flexibility out there anywhere. The help within IV9 is not much help - as usual. I have tried several combinations of positional representation overrides and flexible state overrides within a set of assemblies and see no differences when it comes to flexibility. I guess I just do not understand the implementation.

Thanks.
*Hugh Henderson \(Autodesk\)
Message 2 of 7 (100 Views)

Re: Positional Reps & Flexibility tutorial

08-20-2004 09:31 AM in reply to: mjkelly
mjkelly, With Pos Reps, you create a new pos rep where you can then override assembly constraint(s) and give them a new value. If you do this repeatedly, you can end up with are several pos reps you can click on to get different positional states of your assembly. Example: a door in several pos rep states...closed, open, ajar overriding an angular constraint. Flexibility is a totally different animal. Flexibility allows occurances of a sub-assembly to be in different positions at the same time. Previously, if we wanted this, you would have to bring in the subs as unique ones, not occurances in order for them to be in different states at the same time. Example: An IC engine with a piston and connecting rod as a sub-assembly occurances. Even if the connecting rod is free to rotate, occurances must be at the same "free" angle at any time. With flexibilty, we can have the occurances containing the connecting rod be at different angles at the same time. I hope this helped... Best regards, -- Hugh Henderson (Inventor Workflow QA) "mjkelly" wrote in message news:17060094.1093016284018.JavaMail.jive@jiveforum2.autodesk.com... > Is there a tutorial which explains positional reps and flexibility out there anywhere. The help within IV9 is not much help - as usual. I have tried several combinations of positional representation overrides and flexible state overrides within a set of assemblies and see no differences when it comes to flexibility. I guess I just do not understand the implementation. > > Thanks.
Valued Contributor
mjkelly
Posts: 97
Registered: ‎12-10-2003
Message 3 of 7 (100 Views)

Re: Positional Reps & Flexibility tutorial

08-20-2004 09:53 AM in reply to: mjkelly
Hugh,
Yes, that clears things up for the most part. The only question I have is how are these occurrances of the same assembly shown in the top level assembly? Is it just a matter of applying different constraints to each occurrance? Does that mean that each occurrance must be designated as "flexible"? Sorry, that was more than one question.
*Alex Hatziemmanuel
Message 4 of 7 (100 Views)

Re: Positional Reps & Flexibility tutorial

08-20-2004 10:48 AM in reply to: mjkelly
There is an update book available..... Autodesk Inventor 9 Update AOTC $59.95 per pack (1 in a pack) Your Price: $35.97 Part #: 527090500081600 The Autodesk Inventor®9 Update courseware is designed to enable attendees to understand the new and enhanced functionalities offered in Autodesk Inventor 9. This is a two-day course which focuses on updating the student's prior Autodesk Inventor experience in the areas of: Enhancements to Sketching, Part Modeling, Assembly Modeling, Drawing, and Data Management. There is heavy emphasis on the use of hands on exercises. Instruction length: 2 days "mjkelly" wrote in message news:33356098.1093020869330.JavaMail.jive@jiveforum2.autodesk.com... > Hugh, > Yes, that clears things up for the most part. The only question I have is how are these occurrances of the same assembly shown in the top level assembly? Is it just a matter of applying different constraints to each occurrance? Does that mean that each occurrance must be designated as "flexible"? Sorry, that was more than one question.
Distinguished Contributor
ForrestJudd1
Posts: 107
Registered: ‎06-08-2004
Message 5 of 7 (100 Views)

Re: Positional Reps & Flexibility tutorial

08-20-2004 10:53 AM in reply to: mjkelly
Each occurrence is shown just like it would be in previous versions of Inventor.

The difference is that each occurrence can individually be marked as "Flexible" (toggle this in just the same way you might toggle Adaptivity) in which case any available degrees of freedom can be exploited *for that occurrence only*.

Just like each occurrence of the same assembly can be displayed (either visually or positionally) differently, each can be 'flexible' in the top level assembly.

I think the easiest way to see this is to bring two copies of the same cylinder assembly into a top level assembly, and make both Flexible. If you leave the cylinder assembly under-constrained so that you could freely drag the cylinder rod through its available stroke, you can move the cylinder rods of each occurrence of the cylinder assembly separately.

I've attached a (very) rough assembly that shows what I'm talking about.
*Hugh Henderson \(Autodesk\)
Message 6 of 7 (100 Views)

Re: Positional Reps & Flexibility tutorial

08-20-2004 10:57 AM in reply to: mjkelly
mjkelly, I put an example in customer.files for Flexible Assemblies with instructions. If you look at the example for Pos Reps in C:\Program Files\Autodesk\Inventor 9\Samples\Models\Representations\Stapler, you will see how Pos Reps work instead of my "hand-waving" I hope I'm correct in interpreting that your question is now strictly about flexible assemblies. "how are these occurrances of the same assembly shown in the top level assembly?" -they are shown in the same way as previous releases in both the assembly browser and graphics window. e.g. piston_assembly:1, piston_assembly:2 etc. "Is it just a matter of applying different constraints to each occurrance?" -We don't need to apply different constraints. Basically, a DOF of the sub-assemblies can be in different positions. "Does that mean that each occurrance must be designated as "flexible"?" Yes. If you want the DOF of each sub to be independent, you must make each one flexible. Thanks! -- Hugh Henderson (Inventor Workflow QA) "mjkelly" wrote in message news:33356098.1093020869330.JavaMail.jive@jiveforum2.autodesk.com... > Hugh, > Yes, that clears things up for the most part. The only question I have is how are these occurrances of the same assembly shown in the top level assembly? Is it just a matter of applying different constraints to each occurrance? Does that mean that each occurrance must be designated as "flexible"? Sorry, that was more than one question.
Valued Contributor
mjkelly
Posts: 97
Registered: ‎12-10-2003
Message 7 of 7 (100 Views)

Re: Positional Reps & Flexibility tutorial

08-20-2004 11:12 AM in reply to: mjkelly
Excellent explaination! Thanks.

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