What's wrong with this mirror?
SOLIDWORKS Forums
9 days ago

Boss extrude 3 looks fine, but when it's mirrored it's not up against the wall like it's supposed to be. Part of it is off the wall and part of it is embedded into the wall. What's wrong here?


Categories: Modeling and Assemblies, Parts and Features

Comments
Last comment By: Matt Peneguy   Wed, 15 Nov 2017 19:02:58 GMT
Re: What's wrong with this mirror?

Hello,

 

Extrude3 isn't on the interior surface.

Since the helmet continues arcing inward above Extrude3, the coradial is inboard of the surface.

Create a perp plane to Plane8 and the central axis and in section you'll Extrude3 is proud of the inner surface.

Because of that is, I believe, why Mirror6 goes goof.

 

Cheers,

 

Kevin C.

By: Kevin Chandler  Tue, 14 Nov 2017 17:28:39 GMT
Re: What's wrong with this mirror?

What is the central axis?

By: Eric Eubanks  Tue, 14 Nov 2017 17:52:29 GMT
Re: What's wrong with this mirror?

I am with you Eric.....I am not sure I understood all that either.  But I can't open the part, so I am running blond blind anyway.

 

Kevin Chandler , can you translate that to some sort of Solidworks Lingo?   LOL  Just picking on you, but seriously, I did not follow what you said.

By: Dan Pihlaja  Tue, 14 Nov 2017 17:54:55 GMT
Re: What's wrong with this mirror?

Is plane 9 what you meant?

By: Eric Eubanks  Tue, 14 Nov 2017 17:55:26 GMT
Re: What's wrong with this mirror?

Hello,

 

When I opened the part, view temp axes was on.

By "central axis", I meant the temp axis at the center of the helmet:

 

Click ok to create the above plane, then use it to do a section view and you'll see the extrude is in the inner surface:

 

I hope this helps,

 

Kevin C.

By: Kevin Chandler  Tue, 14 Nov 2017 18:08:43 GMT
Re: What's wrong with this mirror?

I went back to sketch 12 and rotated the sketch and included that in the boss extrude3

By: Tom dunn  Tue, 14 Nov 2017 18:17:21 GMT
Re: What's wrong with this mirror?

Hello,

 

That's what I was trying to illustrate with the images.

As I said in my first reply, the mirror is goof because the extrude, I surmise, isn't where Mr. Eubanks thinks/intended it to be.

 

Cheers,

 

Kevin C.

By: Kevin Chandler  Tue, 14 Nov 2017 18:23:49 GMT
Re: What's wrong with this mirror?

your part appears to be symmetrical. why not just cut the part in half and mirror/pattern the whole body that is modeled correctly. much easier approach with less room for error.

By: Newell Voss  Tue, 14 Nov 2017 18:28:53 GMT
Re: What's wrong with this mirror?

It isn't a glitch or a bug.  Every vertex on the mirrored body is correctly mirrored across the mirror plane.  The mirror plane definition is incorrect.  The mirror plane is defined as the midplane between the Front and Right planes, but the feature being mirrored isn't located symmetrically between the front and right planes.  This view shows what's happening.

 

By: Jim Sculley  Tue, 14 Nov 2017 19:02:10 GMT
Re: What's wrong with this mirror?

I stand corrected.

I understand what you are saying now.

By: Kelvin Lamport  Tue, 14 Nov 2017 20:39:53 GMT
Re: What's wrong with this mirror?

Kevin Chandler, Whether Boss-Extrude3 is merged or not with the helmet shouldn't make a difference, because the Mirror6 feature used the Bodies option.

The location of the mirrored body is just wrong.

By: Kelvin Lamport  Tue, 14 Nov 2017 18:19:49 GMT
Re: What's wrong with this mirror?

I don't know why that mirror isn't working. It appears to be a glitch or bug.

Workaround: Create an axis at the intersection of the front & right planes, and use a circular pattern.

By: Kelvin Lamport  Tue, 14 Nov 2017 18:11:47 GMT
Re: What's wrong with this mirror?

That seemed to work well, but now there's a line between the two halves. I don't think anyone would want a helmet that already has a crack in the middle. How do I fix that?

By: Eric Eubanks  Wed, 15 Nov 2017 17:32:04 GMT
Re: What's wrong with this mirror?

You could combine the bodies:

By: Matt Peneguy  Wed, 15 Nov 2017 17:35:39 GMT
Re: What's wrong with this mirror?

using insert>features>combine merge your bodies in to one and will often remove surface/knit lines as a result. even when it doesn't, the geometry is there to produce the tool which will in turn yield the helmet as a finished product. even if a surface appears split, but is identical/symmetrical the machining program is smart enough to treat is as one continuous region so it wouldn't show up from any method of production via additive or conventional machining.

By: Newell Voss  Wed, 15 Nov 2017 17:39:03 GMT
Re: What's wrong with this mirror?

Newell,

But in this case, wouldn't the helmet shell be injection molded?  In that case, it would be best to combine the bodies, correct?

By: Matt Peneguy  Wed, 15 Nov 2017 17:44:39 GMT
Re: What's wrong with this mirror?

yes you are correct and that is what I was trying to offer as a solution. I simply put it that way because I wasn't sure if he had already combined the bodies or not since I didn't look at the file. I was just trying to say that split lines on a surface will not impact or translate to a finished product.

By: Newell Voss  Wed, 15 Nov 2017 18:26:17 GMT
Re: What's wrong with this mirror?

I misread your post, split lines,  not bodies...  Thanks for clarifying.

By: Matt Peneguy  Wed, 15 Nov 2017 19:02:58 GMT
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