Below are 3 screenshots of me trying to trim a surface with another surface. You can see that I select the trim tool. I then select a surface body. Then I try to select the part of the surface I want to trim, and rather than trim, it adds it to the trimming tool selection.
I've never had this kind of trouble with this before. Is there any chance this is an update bug? Or am I just missing something simple?
Thanks!
Sometimes it matters where you are selecting the surfaces. Please attach your model so the Forum users can take a look. If you do not know how to attach your Fusion 360 model follow these easy steps. Open the model in Fusion 360, select the File menu, then Export and save as a F3D or F3Z file to your hard drive. Then use the Attachments section, of a forum post, to attach it.
John Hackney, Retired
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I had to do a little backdoor work to get it but I think this is what you desire. Model is attached.
John Hackney, Retired
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Here is a little cleaner one, timeline is a little cleaner. The main problem is your loop surface passes through partial rounded edges of the saddle surface. If you need further help, let me know.
John Hackney, Retired
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If my Forum post solved your question, please select the "Accept Solution" icon to do three things. First it allows others to find a solution to a similar question, two, it closes the Forum post and last, it acknowledges that you accept the solution given. If you need further help, please ask.
John Hackney, Retired
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John is correct - it can depend where you select the surface to trim. In the video below, you can see that my first attempt failed, but by selecting the surface to trim in a different place, it works.
We have had similar behavior for some time now, and trimming is a bit quirky.
When selecting a surface to trim, it will be enabled anywhere in an area where there is nothing on the backside, but in areas where there is a surface on the backside, it will be added to the trim tool if it is not near the edge of the surface.
I feel this UI has a little room for improvement, but if you understand the above behavior, this is a problem that familiarity solves to some extent.
Changing the orientation for selecting might work in this particular case but in many, many other cases it doesn't.
I have experienced this many, many times and have not been able to pin a particular selection orientation as a root cause.
Sometimes the trim command works beautifully, other times and in even simpler situations than this, it completely fails and behaves exactly how the OP describes and no way of differently selecting stuff helps.
There is definite room for improvement here and that needs to be recognized!
I was only trying to show how to get trim to work in this particular case. But, point taken, no disagreement
