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mfilleti

trimming to surface or curves

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I'm having a hard time trimming a flat surface to a curve or to a surface. I keep getting the "cannot trim surface, selected curves do not form a closed boundary" message. I've tried extending the two surfaces until they extend beyond eachother before trimming, but I still have had no luck. Any suggestions.

 

That is all

Matt eek.gif

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The ends of curve must extend beyond the edges of the surface.(look in top veiw to make sure)

Try to project the same curve in to the surface and use the trim option.

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quote:

"cannot trim surface, selected curves do not form a closed boundary"

This is the dreaded catch-all error message for trimming surfaces, I HATE it! It tells you nothing useful!! Sorry for the rant but there are reasons for an unsuccessful trim and this message doesn't help at all.

 

Generally surface trims work better with curves than other surfs. Extend your curves beyond the underlying untrimmed surface for best results. Sometimes you have to untrim the surface and retrim to new curves. Trimming works better in the 'construction plane' option than 'normal' to the surface. When possible, trim to a 'plane', this works good. Sometimes when it won't trim in 'top' view it will in 'bottom' view (view #4). Try, try, try anything, you can get it.

 

Good luck, you need it!!!

 

BerTau smile.gif

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One little tip I caught my self doing is being in the wrong construction plane at the wrong time.

You get in a hurry and do not catch things like that.

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THE GUYS COVERED MOST OF THE PITFALLS BUT ONE THING WAS NOT STRESSED ENOUGH. THE CONSTRUCTION PLANE THAT YOU AR IN WHEN YOU MAKE THE TRIM MAKES A BIG DIF!! oops caps again. try makeing the same trim in top and side and you will see what i mean. sometimes you can make things better by projecting the curve onto the surface you are trying to trim, but there again that is driven by the const. plane you do it in.

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I usually copy to a new level

(In case it blows up)!

I also un trim it, make sure or extend the surf past the curves then trim it.

Very view dependent, if Norm will not work, then I try View.It can be a B**** sometimes.

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Copy the surface then bring up the copy now go to Screen Blank unblank that surface now you can extend the new one or trim it to a new bounder from the parent surface being the unblanked surface.

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Imagine that first surface (that looks like a reverse u shape in section = not a closed contour) intersect the second one in the middle of it. The system doesn't know what to do with the area below the u shape on the second surface. I would use /create /curve /intersection/options/ extend surface/ to make sure that the system could trim areas that are not intersected by extending the curve to the edge of the second surface.

If the surface is already trimmed and it has a hole in the middle, you will have to untrim it, trim the surface first with an open contour extended over the edges of the surface to trim. After that, trim the surface back with the closed boundary. Hope it makes sense to you.

 

[ 08-21-2002, 09:03 AM: Message edited by: Mariana Lendel ]

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Now there are some names from the past. Scott Bond and my old buddy Bernie. :D

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Now there are some names from the past. Scott Bond and my old buddy Bernie. :D

This thread is 13 years old.

 

A real blast from the past

I haven't heard from Scott in years

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I just talked to Scott a few days ago.I wanted to see if he needed passes for Westec. He will be coming to Westec this year. I have not talked or seen Bernie in a long time.

 

Who's that CadCam guy? lol

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One last tip.............get everything listed above and still don't trim............Save file..........shut off Mastercam........start Mastercam and open file.........then try and trim........works everytime.....4 me.......

 

 

;o)

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Speaking of names from the past, there's Midwest! :D

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