# Thread: Cutting out 2D sections

1. ## Cutting out 2D sections

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How can I cut out sections of a 2D object? I want to do something similar to slicing, but instead of having to define a plane, I'd like to use something like a polyline. I want to do this so that I can cut off a section of the 2D object and move it. The figure below shows what I want to do:

2. maybe make it a REGION 1st, then slice it, then explode it back.... thats how i would know how to do it.

i dont know of a command that lets you do it for a polyline.

3. Similar to this ...
how can you cut according to your viewpoint only?
Have you ever just wanted to cut as if you had a knife? Without the calculations ...

such as a 2x4 that you looking straight toward ...
is there a way to make a sloppy cut like that?

The only way I know how to make your type of cut is also with the explode option. ;(

4. Gib65

Draw the red line and use the BPOLY command. Pick two internal points -one in each area -and let the program to create the new objects. It will not delete the original lines but two new polylines (or regions) are created and you may move them as you wish.

5. Yes, that's exactly what I needed. Thank you.

6. ## that

Awesome ...
never heard of that command ...
BPOLY= "bisect poly" ???

7. Just to increase your confusion: try to use BOUNDARY in place of BPOLY
BPOLY= "bisect poly" ???
Sorry, ask someone who speaks English better as I do.

8. they're wanting to know what the "B" in "BPOLY" stands for. is it BOUNDRY POLY or BISECT POLY.

bisect = cutting one object into two parts. ;-)

9. So that I don't start another thread on such a similar note:

Is there a way to cut a solid according to your viewpoint? As in if the example above was actually a 2x4 and you wanted to just make a lazy cut through the entire solid with the line drawn ...
I've looked for this many places and I'm stumped ...
If I rotate items in 3D I can make precise cuts sometimes, but often I just want to say "cut this right here" and have it just cut everything toward my view and away from my view ...
For instance, if you had a model of, oh say a fire hydrant,and you were looking dead at it from Z ... or the view Top ,or Front or whichever ...
and you could draw a line from left to right accross the object and have it cut whatever the line crossed.
I kjnow this is very sloppy which is not what CAD was intended for, but sometimesal you need is a cut, and with a complex model itbecomes difficult to rotate it arround and align the slice points ....

Is this a function of me having a poor understanding of the various slice commands?

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Can you draw your cutting line? Start the SLICE command, pick the two ends of the line and as third point enter @0,0,1.
See HERE an example- scroll down to the image 14.

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