Welcome to the Onshape forum! Ask questions and join in the discussions about everything Onshape.
First time visiting? Here are some places to start:- Looking for a certain topic? Check out the categories filter or use Search (upper right).
- Need support? Ask a question to our Community Support category.
- Please submit support tickets for bugs but you can request improvements in the Product Feedback category.
- Be respectful, on topic and if you see a problem, Flag it.
If you would like to contact our Community Manager personally, feel free to send a private message or an email.
Mirror Extrude Should Always Have a Symmetric Result
paul_bunnell
Member Posts: 26 EDU
It seems to me that mirroring anything should produce a symmetric outcome, but that is often not the case when mirroring a feature. The short version is that I have an extrude with "up to face" as the end condition that removes the the right 1/3, then the mirror is not removing the left 1/3, it is removing the left 2/3 (up to the same face as the original)
The clearance for the right knuckle is an extrude-remove going from the outside inward up to the inner circular face of the right knuckle. I'll call it Face A. (plus an offset).
The tab "Is - Before" shows everything up to that point with the mirror suppressed.
The tab "Is - After" enables the mirror. The reason the middle knuckle is gone is that the mirrored cut isn't removing the left 1/3, it is removing the left 2/3 because it is going up to Face A.
The tab "Ought" changes the extrude from "remove" to "new" and creates a temporary cylinder. Mirror is changed from mirror feature to mirror part and works as one would expect. Then the boolean subtracts the two temporary cylinders to create the cuts.
Obviously the "ought" tab is a viable work-around, but In my mind, the outcome of a mirror should always be symmetric.
Tagged:
0
Comments