topic Re: Sketch: Unable to trim 2 rectangles in Fusion Design, Validate & Document Forum

Shetch: Unable to trim 2 rectangles

Anonymous — Tue, 07 Jun 2016 03:32:19 GMT

I'm trying to combine to rectangles in sketch mode. I put the smaller one flush against the larger one, trimmed the outsides of the smaller rectangle at an angle. However, when I attempt to trim the inner line to connect them, the red line indicates that only the line used by the larger rectangle can be trimmed whereas I want to trim only the smaller rectangle line. I see two white points so I would think it would offer me the chance to trim the smaller rectangle line. Why can't I?

Re: Shetch: Unable to trim 2 rectangles

jiang_peng — Tue, 07 Jun 2016 03:53:54 GMT

Hi,

It is possible that the two white points are not actually touching the longer line. Could you please move the two white points a bit and try again?

thanks

Re: Shetch: Unable to trim 2 rectangles

Anonymous — Tue, 07 Jun 2016 04:15:03 GMT

I zoomed in all the way and it exactly touches but if I move the point a tiny amount and bring it back for both points trim does work. Is that a bug?

Re: Shetch: Unable to trim 2 rectangles

jiang_peng — Tue, 07 Jun 2016 06:02:31 GMT

In some cases, the gap between geometries is too small. Even zoom into maximum, we still can not see the gap with our raw eyes

Re: Shetch: Unable to trim 2 rectangles

jeff_strater — Tue, 07 Jun 2016 14:35:47 GMT

you can tell that the points are not really connected because they are drawn as open circles:

If they are connected, you should see a coincident constraint. Here is an example of a similar sketch where one side is connected and the other is not.

So, the best way to get this to work is to add coincident constraints between the point and the line.

Jeff

Re: Sketch: Unable to trim 2 rectangles

Anonymous — Tue, 07 Jun 2016 15:12:00 GMT

OK, so I added coincident constraints by clicking the coincident constraint button, clicking the white point followed by clicking the line. I did that for both points. As the attached image shows, the 2 coincident contsraint icons show up. When I go to trim it still doesn't work. What am I doing wrong?

Re: Sketch: Unable to trim 2 rectangles

jeff_strater — Tue, 07 Jun 2016 15:40:53 GMT

Very strange. This should work. Here is a video showing that it works for me:

However, your picture is evidence that it does not work for you. Would you be willing to share your design here? I think that's the only way we are going to get to the bottom of this.

Thanks,

Jeff

Re: Sketch: Unable to trim 2 rectangles

Anonymous — Tue, 07 Jun 2016 15:53:45 GMT

Will this work?

https://gallery.autodesk.com/fusion360/projects/sketch-trim-test

Re: Sketch: Unable to trim 2 rectangles

Anonymous — Tue, 07 Jun 2016 15:54:23 GMT

Or this?

Re: Sketch: Unable to trim 2 rectangles

Anonymous — Tue, 07 Jun 2016 16:39:06 GMT

Attaching screencast:

Re: Sketch: Unable to trim 2 rectangles

jeff_strater — Wed, 08 Jun 2016 00:12:29 GMT

Thanks for the model, @Anonymous,

I would say that this is a bug. This should work. I suspect the problem is that there is some overlapping geometry:

and this is confusing the Trim command.

If I delete that line, it helps, but it seems that Trim is still confused. I have to actually drag the small lines to get it to work. Here is a video:

I'll file this as a bug.

Jeff