hydraulic cylinder flipping

[philqpr]

Hi,

I am experimenting with a hydraulic cylinder arrangement consisting of 3 hydraulic cylinders, the end cylinder keeps flipping. I have tried various constraints to stop this from happening but with no joy. 

Any solutions to this problem greatly appreciated.

Please see attached dataset and word document highlighting the flip issue.

Please note on the attached dataset to keep within the 5MB limit I have moved the end of part marker up on 5 attached parts, this will become evident when the assembly is opened up. please open up individual parts and move end of part marker - any constraint issues after an assembly update will clear once this is done.

Regards

Phil

Inventor Professional 2014 service pack 2

Windows 7 64 bit SP1,

Intel core i7-2600 CPU @ 3.40GHz,

16GB ram,

[WHolzwarth]

How about this? I've deleted unneeded constraints and added some angular limits.

Only changed files (2014) are attached.

Walter

[johnsonshiue]

Hi! It seems to have something to do with Angle:4. It is not using the Explicit Vector option (3rd option), so sometimes the solver gets confused with 0 and 180.

Thanks!

[philqpr]

Thanks for the replies and taking the time out to answer.

The use of the joint command in 2014 is something I have not used, there is alot potential in using this command - I need to get up to speed with this. I will look at tutorials for this command.

The explicit vector option does make a difference, I had been experimenting with this during the day and so far has been producing stable results.

Cheers

[WHolzwarth]

Yes, many people don't know about the benefits of Joints.

You can:

- Replace 3 Mate or Flush constraints with only a single Rigid joint

- Replace an Insert or Mate/Mate combined with an Angular constraint with only a single Rigid joint

- Transfer Joints easily to Dynamic Simulation

- More can be said by Autodesk marketing 😉

But you can't:

- Transfer Joints to Studio or Showcase. Well, perhaps Autodesk marketing will tell, why not 😉

Walter