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Starting a sketch from the face of a context of another part in an assembly
john_gentilin
Member Posts: 15 ✭
In this document,
https://cad.onshape.com/documents/9ec3baa19294f3198f092b39/w/26baf85d5c38ccafe4ec1fc0/e/9e352b7a38551480396b76b2
Note: Look at revision "V5" in case I move on from here.
On the Neck Assembly, I created Neck Parts as a "New Part Studio in Context". In that Part Studio, I am shooting sketches off of surfaces in the assembly. i.e. Neck Parts::Sketch5. My question here is the volatility of that sketch. I moved the servo motor in the assembly but the sketch surface did not move with it. What it did do is make a shadow copy of the original. The same happened when I pulled the diameter from the other stepper shaft in Sketch1 using the "use" command. I just want to verify the "use" and derive sketch from other context's are really copies of the original and are not tied to changes in that original part.
https://cad.onshape.com/documents/9ec3baa19294f3198f092b39/w/26baf85d5c38ccafe4ec1fc0/e/9e352b7a38551480396b76b2
Note: Look at revision "V5" in case I move on from here.
On the Neck Assembly, I created Neck Parts as a "New Part Studio in Context". In that Part Studio, I am shooting sketches off of surfaces in the assembly. i.e. Neck Parts::Sketch5. My question here is the volatility of that sketch. I moved the servo motor in the assembly but the sketch surface did not move with it. What it did do is make a shadow copy of the original. The same happened when I pulled the diameter from the other stepper shaft in Sketch1 using the "use" command. I just want to verify the "use" and derive sketch from other context's are really copies of the original and are not tied to changes in that original part.
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NeilCooke
Moderator, Onshape Employees Posts: 5,379 
Hi John, an in-context edit is versioned i.e. it is associative to the assembly at that moment in time. This makes it very robust, since in most cases you don't want a part to update when an assembly part moves. If the parts need to move together (rather than one of them change shape when the other moves), it still needs to be mated.
In your case, if you want it to update when you move the motor, right click the part and select "update context". It is not dynamic. Your in-context will then update to the latest "moment in time". Hope that makes sense.Senior Director, Technical Services, EMEAI6
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In your case, if you want it to update when you move the motor, right click the part and select "update context". It is not dynamic. Your in-context will then update to the latest "moment in time". Hope that makes sense.