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Using Inter-Design Constraints to Update Features in Other Parts




Often times during the design process, features in one part are based upon features in another part. After changing the first part you have to go back and manually update the features in other part. Editing the part from within the context of the assembly can give you some time-saving advantages. In the above engine assembly, we want the three holes on the Intake to always be aligned to the corresponding three threaded studs of the Engine Block.

Editing the child part

In the assembly, right click on the child part and select Edit Here (this can be done either in the Design Explorer and on the actual part in the workspace); in this case we will edit the Intake. Since we are now editing the part you will notice that the workspace changes from the assembly workspace to the part workspace.




Editing sketch in the Intake

In the Design Explorer, right click on the sketch where the holes are located and select Edit. We want to make the three selected holes have the same diameter and the same location of the bolt studs. To do this, use the Coradial sketch constraint and select the first circle and the first bolt stud cylinder. Since we are editing the Intake, the circle will move in relation to the bolt studs in the Engine Block. A green reference circle and the coradial sketch constraint will be now be visible.




Viewing the new sketch

Exiting out of sketch mode will update the geometry accordingly. Since the other two holes are still not aligned (initially we only aligned the first pair together), edit the sketch and use the Coradial constraint between the other holes in the Intake and the bolt studs in the Engine Block. All three holes will now be coradial to the three studs.




Getting back to the Main Assembly

Now that we have completed aligning the holes to the shaft studs, we need to get back to the main assembly. First, since the holes we were constraining were in the first sketch we need to move the dogbone to the bottom of the Design Explorer so we can see the rest of the features; the easiest way to do this is with the keyboard shortcut of F5. When the rest of the features are shown, in the Design Explorer right click on Intake (the file name of the part we are editing) and select Edit Root Assembly. The workspace icons will change from the part modeling icons will change back to the assembly icons.




Editing the Engine Block

Since the holes of the Intake are constrained to the studs in the Engine Block, moving the stud location or changing the diameter will update in the Intake automatically once you exit out of sketch mode.