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vilemduha / blendercam

Automatically exported from code.google.com/p/blendercam
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Overcut option? #20

Closed narvf closed 8 years ago

narvf commented 8 years ago

Is it possible to add an overcut option in corners? I have no experience in programming. This is useful for example in plywood when i have two or more elements to put on inside another.

Like here for example http://www.cambam.info/doc/plus/images/overcut.png

vilemduha commented 8 years ago

Since there are so many overcut options, I so far decided not to try to add this feature. It would have to have manual input anyway probably...

ghost commented 8 years ago

I do it manually using the drill strategy as an operation. I just mark all the corners that need overcut and do it as a chained operation. I use a circle curve the diameter of the bit (usually an end mill) and then its easy to place exactly on the corner. Just use alt-D to clone the curve while in edit mode for each corner and move the curve on the z axis to the depth of cut needed. I guess if you have a lot of corners to do then automating it would be faster.

vilemduha commented 8 years ago

Well it would, especially also because the overcut is correct when you do not put a circle in the corner, you just need to touch the corner with the side of the circle. I always thought about overcuts as part of design, not relaly something CAM should do...

narvf commented 8 years ago

Great idea nfz. I do my projects in inkscape and the import svg filem. Se it's not such a big problem to add circles and use drill option :)

vilemduha commented 8 years ago

Hi, just commited overcuts operator. Select curve or text object - hit space, write overcut.

Let me know if this works correctly.

ghost commented 8 years ago

Checking it out...

ghost commented 8 years ago

I must be missing something. I set up a square using a bezier circle and applied the overcuts operator. A curve is created with the identical shape (a square). I played with the diamter and threshold and can see in the terminal window new calculations being done but no change in the shape. overcuttest

blendercamovercut.blend.zip

I will keep playing and take a look at the code. Probably silly user error.

vilemduha commented 8 years ago

just check also outer polygons option. - it is quite logical to make the overcuts only in holes, and your shape doesn't have any hole - the algorithm assumes it is working on a whole shape which is to be cut. If you check the

vilemduha commented 8 years ago

hm ok - so the algo is written this way - it adds overcuts only to inner angles. I will add an invert option, where it's assumed that you actually want to create only the hole. Test it with some text object to see how it works now..

vilemduha commented 8 years ago

also, remember you can always use the Intarsion operator, which is there to make perfect inlays - shapes that can be milled both from inside and from outside.

vilemduha commented 8 years ago

changed this and now things should give more sense. here you can see inner/outer overcuts, vs intarsion operator result: image

ghost commented 8 years ago

Cool. My test case works now. Thanks. I will play some more with this then update the wiki. Its definitely a lot faster this way than the way I was doing it. Greatly appreciate this.

narvf commented 8 years ago

Great. I will check this in free time. Thank you.

schef commented 8 years ago

Hey guys. I'm just trying this out and am not sure how to use this when i have an mash object for example a cube 20x20x3 with inside hole which is 5x5x3. is there a way to apply overcuts to cam path?

vilemduha commented 8 years ago

Use curve objects.

schef commented 8 years ago

Should i convert my whole object to curve? Or just use a 2d curve? Do you have a good sugesstion on how to move from mash to curve..

schef commented 8 years ago

Are there some sugesstions to overcome this specific problem. I am trying to use blender only but am not sure how to make cornerovecut on the mesh objects. Any sugestions would be appreciated (also workaronds).

ghost commented 8 years ago

Could you post an image of the mesh and the cam path?

schef commented 8 years ago

So my tool is 3.5mm

blendercam_overcut_mesh

vilemduha commented 8 years ago

this is a perfect case for doing it as a curve, not as a mesh object... -Create a curve -use overcut operator on it, -use the result curve for your profile operation. I am closing this as an "issue", since I consider this now more a support topic, which should be handled in the forum.