topic Re: How to trim complex shapes in AutoCAD Forum

AutoCAD - How to trim complex shapes

robin.pragerX2JU2 — Thu, 13 Oct 2022 10:47:05 GMT

Hi!

I am wondering how to trim a large number of lines around a countour, the countour is easy to see by the eye but I can not find a way to trim it. See picture 1 for how it looks like without trimming and picture 2 for how i want it to look like after trimming.

[ The subject line of this post has been edited to include the product name by @handjonathan ]

Re: How to trim complex shapes

tim_crouse — Fri, 07 Oct 2022 15:22:28 GMT

Use the "XTRIM" command

Best Regards

-Tim C.

Re: How to trim complex shapes

robin.pragerX2JU2 — Fri, 07 Oct 2022 21:11:50 GMT

Hi Tim! Thank you for the answer!

the contour is not a single entity, it is formed by multiple lines and arcs. So I don’t think xtrim will work (I am not sure)

Do you have another solution.

best regards Robin

Re: How to trim complex shapes

leeminardi — Fri, 07 Oct 2022 22:15:34 GMT

Draw a rectangle around some of the drawing and then use the BOUNDARY command to create a singe polyline by picking a point inside the rectangle. Trim as necessary.

Re: How to trim complex shapes

tim_crouse — Fri, 07 Oct 2022 22:39:02 GMT

If you can set the boundary on its own layer or as a separate color, you can use qselect to select the boundary then use xtrim.

If you can share the drawing I could experiment .

Best Regards

-Tim C.

Re: How to trim complex shapes

leeminardi — Sat, 08 Oct 2022 01:38:03 GMT

Here's an example of using boundary. The red lines are similar to the rolling profile you are using to create an involute curve. The green polyline is the result of the boundary command.

Re: How to trim complex shapes

tim_crouse — Sat, 08 Oct 2022 02:06:24 GMT

Ah, now I see. Good work.

Hopefully the original complex boundary can be uploaded so we can do a couple tests.

-Tim C

Re: How to trim complex shapes

robin.pragerX2JU2 — Sat, 08 Oct 2022 06:54:48 GMT

Hello guys! The boundary box worked very well. I very much aprreciate your time and effort! I can upload a dxf file so you can try for your own. My next step will be to try and make it automated.

best regards Robin