I'm trying to mirror a Cut Extrude using the Plane 6, but as the title suggests, the completed feature "propagates" instead of making a symmetrical sibling
I'm trying to mirror a Cut Extrude using the Plane 6, but as the title suggests, the completed feature "propagates" instead of making a symmetrical sibling
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Lucas,
Did you do an up to surface with your extrude cut you are trying to mirror? I suspect this would be why it's failing as the mirrored version would go up to the same surface & remove everything. If so try doing a blind extruded cut instead & mirror that.
Kevin Pymm is right. Since that Extrude was set to "Up to Surface", the Mirror uses the same face. I tried a blind Extrude set to the same distance, but that doesn't work since Extrude2 isn't centered on Extrude1. I'd recommend creating a second Extruded Cut on the other side, using Convert entities to get the same shape, and use the appropriate surface for the end condition. You can then use Plane7 to mirror these two features if that's the result you want.
Same as said above, you need to change your end condition because the mirror will cut up to Plane 5 as well, seemly making a through all cut.
Alternately, you could change your sketch plane to Plane 5 and reverse the cut direction with a through all or up to next end condition. If you mirror that about Plane 6 it will give you the desired result.
Sarah Dwight wrote:
Alternately, you could change your sketch plane to Plane 5 and reverse the cut direction with a through all or up to next end condition. If you mirror that about Plane 6 it will give you the desired result.
Sarah,
I'm afraid you're mistaken. That would work well, but BossExtrude2 isn't centered on BossExtrude1, as I said above. I didn't investigate the cause, but I suspect it's because of all the undefined sketches.
Oh you're right that it doesn't go up to the opposite face of Extrude2, but that's not technically what he said he wanted.
He wanted a mirror of Cut-Extrude1 about Plane6. He will get that with my suggestion. Whether the rest of his model is symmetric about Plane6 is the OP's choice. Maybe he wants it that way. Maybe this is helpful to show him it is not!
The fact that the mirror function used the end condition of the cut-extrude is the real issue here.
I would expect it to just mirror the geometry, not the end conditions within the feature. That's weird (to me).
It is really weird when you use Plane5 for the sketch and make the end condition Plane3. Mirroring that about Plane6 looks like this... which is unexpected because I assumed the cut would go away from Plane6 not through it. The preview shows what I expect. The final product does not.
Just as a quick additional solution for the OP if you are dealing with this issue in a more complex situation is if you make anything you are needing to mirror a separate body and then use bodies to mirror it breaks the issue of up to surface constraints. Just turn off Merge Result on the first feature that'll eventually be mirrored and have the rest all setup as merge result>selected bodies>"Name of Body that is to be mirrored" Then after the body is added either use Combine to make all 3 bodies merged back together. Just as a note in this circumstance the way you'd do it is make the original feature a boss extrude with merge result turned off and then after mirroring the body Combine with subtract (Yup Good ol' Boolean Operations!)
P.S. Personally I hate using blind condition when a Up to Surface condition is the ideal geometric condition and by mirroring the body it circumvents this problem in the software.
~Eric
Oh Great! Now I have to down load the model and try all three methods to see if i understand these variations.
Did you do an up to surface with your extrude cut you are trying to mirror?
Yes
That's precisely what I need
I suspect this would be why it's failing
You are correct
As "blind", it works fine
Since that Extrude was set to "Up to Surface", the Mirror uses the same face
The fact that the mirror function used the end condition of the cut-extrude is the real issue here.
You got it
Now someone tell me that the intern that dassault left to program this feature was fired already
Seriously... That's the most ***** bug I ever encountered while working with CAD
I'll do as Glenn and/or Sara wisely suggest
(Because it's possible. I wonder what would be if not...)
Both achieved the result I intended
I found Sara's solution particularly more clever due to it's simplicity, compatibility and flexibility
Glenn's solution works very well for this piece, but if I change the spacing between the planes (if ever necessary), the changes are not reflecting
I'll also fix the overall badly planned features. In my defense, they are a reflection of the messed up measurings available on the blueprint I'm following
Eric's answer summarizes well my building preferences: mirror a body when the thing is totally symmetric.
Didn't use it this time for the reason stated above: blueprints with confusing measurements that conduct the construction on a different way
Thank you all for the attention and solutions
And a middlefinger to dassault
I'm with Eric on this one, it looks like the whole part is symmetrical, so I would model one half and then mirror around the centre plane, rather than having to mirror several features to get the result.
Stu...
Well, I'm glad to see this is still being a pain in 2019 v5....sigh
Same as said above, you need to change your end condition because the mirror will cut up to Plane 5 as well, seemly making a through all cut.
Alternately, you could change your sketch plane to Plane 5 and reverse the cut direction with a through all or up to next end condition. If you mirror that about Plane 6 it will give you the desired result.