Mulit Body Modeling Video

[MarkFlayler]

Guys, check out this video I did on Multi Body Modeling in Inventor 2010. About 7 minutes long.

[shift1313]

Thats a good video mark. Very well explained.

 

Question for you. When you Made Components and had your assembly file, you noted that there are no constraints, but in your model treel all your components are grounded. If you Un-ground them, will they all move individually or is there some other reference that keeps these parts fixed to each other. Say since you made a sort of vise and you wanted to show different positions or drive it for an animation would this be possible?

[MarkFlayler]

They will move individually if ungrounded but the geometry will still update as if they were together. This means less complexity to the assembly by avoiding mundane constraints as these parts all share the same origin. If I wanted to unground the slider and use constraints on it, nothing is stopping me. Multi Body is generally used for plastics but has some great power as well with static assemblies too. The next video I am going to make will be on Layout Design which if you know SW sketch blocks you should understand that one right away too.

[shift1313]

cool. I do use multibody parts but I havent used them in the context of your video. That is a cool trick!

[Lazer]

Nice tutorial Mark, very well done:). Looks like the new multi body is very powerful.

[shift1313]

I did run into one limitation of it this weekend. I drew a motorcycle sub frame as a multi-body part and went to run a stress analysis on it with no luck. It doesnt support multi-body parts and suggested putting it into an assembly or creating a part from it. I did both and still got the same error so I had to go back to the original and roll back through my operation making everything union.

[JD Mather]

... suggested putting it into an assembly or creating a part from it.

 

Did you go to the Manage tab and push all of the solid bodies out to individual parts and an assembly? (Make Components command from Mangage tab should result in an assembly like any other assembly - that you can run FEA on. One problem - relatively long parts relative to thin cross section don't do well in Inventor FEA.)

[shift1313]

Yes I did JD. I did both Make Part and I also made an assembly, a weldment from the assembly and so on. Even though it was no longer a multibody part i still had the same error until I made it a single solid body from the get go. This was only one instance and I havent tried it in another context.