Multiple parameters and joints confusion.

[jamesf2SRYX]

Hi All.

I have what I think is a simple problem, I just dont know where im going wrong.

I have a frame that needs to support a cylindrical shell and spin it around.  I want to be able to modify the height, width, front and back lengths of the frame so I can shuffle the wheels around and see where they work best.

I can get it to work no problem, but as soon as I change the parameters i put in, there is always something that goes wrong.  I think there must be some "best practice" at doing this that im missing.

I have a feeling its to do with using projected geometry too much.  But then how else do you use existing geometry to make your parts?  

Like I said i think this is basic, but im missing it somewhere.  Ive done this one several times with bodies, components, joints, mirrors, no mirrors etc.  

The actual design itself doesnt really matter, its more the concept of how to approach this.

Last time i posted and someone helped me, i accidentally marked my own reply as the accepted solution and offended the person who helped me.  I wont do that this time!

https://a360.co/4iaOqy3

Any help much appreciated.  

Kind Regards
James

[TrippyLighting · Accepted solution]

If you run Modify->Compute all, you'll find that your design's timeline has 11 warnings (yellow icons). That is before any parameter change.

Also, it is good practice to debug your design as you add parameters, not just at the end, making debugging very tedious.

[davebYYPCU · Accepted solution]

The Shell component starts life at the File Origin.

We end up with the Frame End on the File Origin, and the model is mostly symmetric at the Nozzle Shell alignments.

Gunna make things confusing.

User parameters you have are almost the same, long frame members being 980 and 920, but in the window, they are both the same.

Gunna make things confusing.

If - big IF, the wheels are to run at 45 degrees to the shell, why would you have a frame height and a frame width, as separate parameters?

Gunna make things confusing.

You have a lot of hole count parameters, and again 

Gunna make things confusing.

Which parameters are breaking?

Happy to help if I can.

[jamesf2SRYX]

Thanks both for the advice.  I will do a new model and see how I get on.  Will post for your review if you dont mind.

[jamesf2SRYX]

Hi

I did it again and it seems to work this time.  Thanks both for the advice.  I changed the model parameters which makes it a bit more awkward to find later, so i will create user parameters next time, but checking the model as i go along helps.  Also i changed it a bit to remove the hole commands.  That seemed to be an issue?  Maybe, not sure, but it works now enough for me to carry on with the real thing.  Many thanks.

James

https://a360.co/3XVaWCI