Full Version: Specific model and general milling preparation questions ?

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As a follow-up to this technique I've attached a simplification because although I could create planar on one side after following your technique Michael as I was unable to reproduce on the other side. A mirror does work, but planar or the following technique does not. I extruded a line vertically from a magenta curve on one side and a cyan curve on the other. The magenta curve can be boolean diffed or trimmed with the "curiosity" object without issue while cyan curve cannot do either. I'm unable to see any difference between the two sides and reproduced in a symmetrical manner so I'm stumped ?
Furthermore when viewing from left side I should see cyan curve and from right side magenta curve, but I see magenta from both sides.

Sven

Attachments:
masthead base follow-up.3dm

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Hi Sven,

re:
> The magenta curve can be boolean diffed or trimmed with the "curiosity" object
> without issue while cyan curve cannot do either.

I'm sorry I'm not understanding this part.

Is this the curiosity object here? :



And the magenta curve is this one?



I'm not understanding how you would boolean those together, if a plane is extruded from the magenta curve upwards, it just barely grazes the end of the curiosity object and does not divide it into pieces:



- Michael

Image Attachments:
sven_bool1.jpg  sven_bool2.jpg  sven_bool3.jpg 

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Hi Michael, I assumed too much...



so in this image I can successfully boolean diff the blue object from the magenta base object ( trim works equally well ) resulting in...



but when I try the same thing with cyan curve ( either boolean or trim ) it doesn't work. I've tried recreating ensuring symmetry so I'm not sure what I'm doing wrong...



lastly, I notice that viewing from the right results in same image as viewing from the left, but should I see cyan and not magenta line from the right ?

right view


left view

Image Attachments:
Screenshot from 2024-02-25 12-06-50.png  Screenshot from 2024-02-25 12-12-17.png  Screenshot from 2024-02-25 12-17-03.png  Screenshot from 2024-02-25 12-20-39.png  Screenshot from 2024-02-25 12-20-47.png 

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I hope the next model help you

Attachments:
masthead base follow-up.3dm

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Hi Sven, ok thanks I think I understand better now.

Surfaces that barely graze each other and are also tangent can tend to be more difficult in surface/surface intersection calculations.

It will be easier for Trim to work on your cyan plane if you select the edges as the cutting objects rather than the full object, like this:



Then it should be cut up ok:



Also another way you can do it is to draw in 2 connecting lines like this:


Then select the lines and edges like this:



And then Construct > Planar can make a trimmed plane there:



- Michael

Image Attachments:
sven_planar_1.jpg  sven_planar_2.jpg  sven_planar_3.jpg  sven_trim1.jpg  sven_trim2.jpg 

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Thanks for explanation Michael. I realize that there are other solutions, just figured I had to be doing something wrong given the symmetry of model and it working one side, but not the other.

Thanks for the models vic.

Sven

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