Unwanted Internal Islands in Hatch and No Hatch Area

[Anonymous]

I'm working on a project evaluating the material usage on our plasma tables. The software only allows the operator to save the nests they create in g-code. I have a program that can create a DXF from the G-code, and I have using the HATCH command in Autocad to find the area of the skeleton.  This works great when the parts are large and simple, but I run into many issues when the parts have more features and islands. When this happens, the hatch area disappears from the properties menu.

In the file I've attached, even with Outer Island Detection selected, some internal islands are included in the hatch.

I've tried to run PEDIT, to join the segments, but there are too many open segments to stretch.

I also tried many different gap sizes, but this creates other problems, like completely covering some parts with the hatch.

Is there anything I can do that might be able to get the hatch sorted out?

[pendean]

Is this a continuation of your similar problem posted in another forum? It appears to be:
https://forums.autodesk.com/t5/autocad-lt-forum/hatch-extends-beyond-selected-area/m-p/9622532#M1842...

You seem to be having the same exact problem, and the same exact solution should work as you appear to still have the problem of open area that are not closed properly.
And how are you selecting the boundary you wish to hatch? Hint, actually electing only the boundary you wish to hatch is the best approach.

[TheCADnoob]

This doesn't address the question you asked but may help with what you are trying to do. Have you looked into the nesting tool that can be used in Autodesk Inventor?

https://www.autodesk.com/education/free-software/autodesk-inventor-nesting

Quick video

https://www.youtube.com/watch?v=OXagiEj0n0s

[Anonymous]

This is for the same project, with a (possibly) similar problem on another drawing. This time when I select the interior just inside the rectangle, the hatch builds without an error message but doesn't show the hatch area in properties.

[j.palmeL29YX · Accepted solution]

In >>this video<< is shown a suggestion. Give it a try.

Please mark "Accept as Solution" if my reply resolves the issue or answers your question, to help others in the community.

[Anonymous]

I think I found a solution. Even though I didn't get a message i found:

"A closed boundary could not be determined" when creating a hatch in AutoCAD products 

I ran the overkill command and copy pasted in a new window. I was then able to get the hatch area.

[pendean]

This is still the same exact problem as last time (except new shapes) and the same fix still applies: you can either redraw the outlines to be closed on a new layer (see video tip above) or use HATCH command's GAP TOLERANCE exactly as you tagged to be the solution in your last post.

Forgive me, but why do you think this problem is different? Do explain, perhaps more guidance is needed for you. Do let us know.

[Anonymous]

This is incredible. Thanks very much.

[Anonymous]

Even when I create another layer and use boundary, I still have some random internal islands. Jürgen's solution works great for me, but I'm wondering what could be causing that. Is the hatch trying to follow one side of a line? do the lines have "directions"?

[cadffm]

General,

Sure, a line have START and END point,

direction is from start to end.