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In context part studios - master modelling technique.. Design assembly - parts not fixed in space?
Andrew_Gunstone
Member Posts: 6 ✭
Hello, forgive me but moving from creo, solidworks etc to Onshape.
Trying to do master modelling design for a project that we have - industrial designer creates the surface reference file and i create a new top level assembly with these REFs in place. I then create seperate parts and edit in context to take the surfaces from the REFs. This way if the designer changes a surface this is replicated into the seperate parts. All parts are inserted to the same origin. This works in creo, solidworks etc. I have tried to start it in Onshape.
However i find that the parts which were created in context and that form my design assembly are free to move?! I have one that is fixed but normally they were inserted at the origin - why are they now free?
If someone can help this would be amazing, thanks.
Answers
Inserting a part into the asm doesn't actually mate it. You still need a mate. (or you can use the "rigid" part studio insertion option.
Put a MC at the origin of each part, and a MC at the origin of each sub-asm and top level asm. Then when you insert them into the sub-asm, use a fixed mate for each part, referencing the part's MC and the sub-asm's MC.
You can also fixed mate the sub-asm's to the top level asm referencing the MC's at each's origin.
There is also a featurescript called mulitmateconnector that you can use to assign a MC to each part in a part studio if there are many parts.
Also FYI, there is a newer functionally built as a FS that works like Pub-Geom in ProE/Creo did, if you had the advance assembly option in ProE. Here is a video and link for the FS. Just an option for you…
https://cad.onshape.com/documents/40d43cad542dccfa4772d7e1/v/856bd2b631f7e35c4a2b34ad/e/788996d08647863b81b2ff61
Using "Derive" features to bring in the ref. surfaces in your part studio is a better way than using contexts. The "publish geometry" Featurescript linked above adds a bit more on top of that but relies on the derive workflow.
@eric_pesty can you give a bit more info please on this other workflow?
thanks to the others for their inputs as well, much appreciated.
This (and other strategies) are discussed in detail in https://learn.onshape.com/learn/course/master-model/introduction-to-master-model-workflows/defining-master-model-techniques
Also Greg's Video linked above by Nick goes over a lot of the concepts.