I am currently reviewing the Sync side of SE (ST8) with a view to driving wider use within my company. There's lots of useful information and videos on this site which has been a great help. As part of this process gaining a greater understanding of how ST works, its strengths and weaknesses is important in view of any internal discussions we have.
As part of the testing we looked at multi-body parts in the sync environment. The part in question is not important more the process and my understanding of why it behaves as it does. I believe I understand but would like to throw this out to the group so somebody more knowledgeable and expereinced than I can clarify for me.
Test MB (Sync) part in question.
Try to move the boss either via the torus or edit the 180 dim.
If I did the same edit in a single body Sync part then this failure does not occur. I believe the issue is down to the face on the web which was created tangent to the boss and therefore any move wants to change the size/shape of that face which in a MB part using sync is not possible? I've tried the various options in the command as well as turning off all design intent.
I created a similar MB part in ordered and used a sketch to control size etc. When I change the same 180 dim then the part updates as a single body sync part in that the faces tangent to the boss adapt at their angle changes due to the boss moving.
I hope that all makes sense.
Solved! Go to Solution.
Not really a sync user, but a quick test shows you can create a concentric relationship between the axes of 2 cylinders, each in different bodies.
So in your case, this should enable you to move the boss and have the mating face of the web move at the same time.
It's the web that causes the issue, delete the web and you can move the boss. I believe it is the face mating the web to the cylinder which is unable to chnage size/shape in the MB sync part which causes the failure. I'd like to know if other think I am correct in saying so and if so then is this working as intended or could it be considered a 'bug'?
Ok. I didn't take the test far enough.
Have to agree with you it doesn't work.
For me this is yet another example of the limitations of sync modelling.
There may be fancy ways round the problem, but that isn't the point - it should be simple.
Ok, I sort of have this working, by applying relationships.
Concentric for the 2 cylindrical faces.
Tangency between top face of web and the boss.
Tangency between bottom face of web and boss.
You also can solve that with live rules only.
But therefore You must turn on the tangent contact live rule too!
Thanks guys, OK one final question. Using live rules is there a setting which means the rib will maintain the correct association with the base? In a single body part the tangent connections would adapt to allow the boss to move rather than as happens in the MB part (as I have it).
If you applied locked dimensions, wouldn't that do what you are asking?