intersect function

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intersect function

Postby Leggy » Wed Jul 03, 2019 7:33 pm

hi Ive working on a design see attachment
the square plate is flat, when you pull the circle through the plate and intersect with selected the top face distorts
any ideas?
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Re: intersect function

Postby TIG » Wed Jul 03, 2019 8:30 pm

The file you attached is the backup file ["step test 15.6~.skp"]
Note that on a PC it'd be named "step test 15.6.skb"

That said, and assuming that the SKP's contents are much like the main model...

There are some critical areas that need fixing.
Try thomthom's SolidInspector² to see them...
It is a relatively simple form that can be made from scratch quite easily, but in its current 'mangled' state it'll be quite hard to 'fix'...
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Re: intersect function

Postby Leggy » Thu Jul 04, 2019 8:30 pm

sorry try again
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Re: intersect function

Postby Leggy » Thu Jul 04, 2019 8:32 pm

sorry correct one
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Re: intersect function

Postby TIG » Thu Jul 04, 2019 9:03 pm

That's the backup of a backup file ! ending in "~~.skp"
Don't you have a file named "step test 15.6.skp" ??
With not ending ~ characters - which show it's a backup file ?
If you have worked on the backup file you should rename the file without the ~ otherwise it's the route to confusion......
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Re: intersect function

Postby Leggy » Fri Jul 05, 2019 1:02 pm

try again
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Re: intersect function

Postby Leggy » Fri Jul 05, 2019 1:05 pm

morning
how can you tell what's mangled :o , I keep getting messages that something is wrong , but can never see why
thanks
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Re: intersect function

Postby Dave R » Fri Jul 05, 2019 1:27 pm

There's a lot of bad geometry created by the intersection of the two shapes and you need to clean it up. Some of it Solid Solver or Solid Inspector will do but a lot of it will need to be done manually.
Screenshot - 7_5_2019 , 7_20_55 AM.png


Hiding outer surfaces will make it easier to get inside and erase the unneeded stuff.

When you get it all unmangled, it should look like this.
Screenshot - 7_5_2019 , 7_21_20 AM.png


Much of the problem comes from the size you are working at. If you'd taken the advice given in your other thread about working at a larger scale, you would have an easier time of it.
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Etaoin Shrdlu


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(THERE'S NO PLACE LIKE)

G28 X0.0 Y0.0 Z0.0

M30

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Re: intersect function

Postby TIG » Fri Jul 05, 2019 2:22 pm

As Dave says...
It's not a solid because it has lots of modeling errors.
SolidInspector² shows you have many internal partitions and missing faces - both of which prevent solidity - every edge must support two faces - no more, no less.
There are also a lot of leftover faces and edges within the form [especially near the part with the hole].
Your form's size also gets very near the 1/1000" tolerance limit - especially where the curved upstand's segmentation doesn't match the part around the hole and the 'valley' between them is therefore not evenly formed.
Modeling with softened/hidden edges also makes life difficult to see what you are doing.
In the attached SKP [v2017] I've fixed the issues and it's now reporting as a solid.
Note how I've tweaked the Style to shown end-points and profiles, so the repairs are then easier to see.
To get inside I used section-cuts [fill off in Style].
I also un-smoothed all edges, and selected all to use 'unhide', so I could see everything as I went through erasing unwanted geometry.
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Re: intersect function

Postby pbacot » Fri Jul 05, 2019 6:28 pm

You guys have a lot of patience and generosity...
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Re: intersect function

Postby Leggy » Sat Jul 06, 2019 2:23 pm

you guys certainly do , Thanks so much for your help
I did scale it up by x10 but obviously wasn't enough
ill download the extensions next week
Thanks again Dean
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Re: intersect function

Postby Leggy » Sat Jul 06, 2019 2:27 pm

so is that view on x-ray?
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Re: intersect function

Postby Dave R » Sat Jul 06, 2019 3:38 pm

Leggy wrote:I did scale it up by x10 but obviously wasn't enough


As I wrote the other day in your other thread:
you should model in meters instead of millimeters.


That's effectively scaling up by a factor of 1000! I don't know why people are so afraid to scale the model up sufficiently.

Leggy wrote:so is that view on x-ray?


Yes.
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Etaoin Shrdlu


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G28 X0.0 Y0.0 Z0.0

M30

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Re: intersect function

Postby Leggy » Sun Jul 07, 2019 2:41 pm

Hi
I see now its in solid inspector, I've downloaded
thanks again Dean
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