Question on Drop Cutter

flatline
2010-09-08
2013-03-08
  • flatline

    flatline - 2010-09-08

    First I have to explain, I have no professional knowledge of milling 3d or 2.5d. So right now I try to figure out how to get the results I´m looking for.

    I just stumbled over a strange thing when finishing the part with a dropcutter task. Vertical faces are not vertical anymore. They have a slight angle.

    I´m using a 8mm cylindrical cutter. So it should be possible to mill this vertical.

    What am I doing wrong?

     
  • Lars

    Lars - 2010-09-09

    Hi flatline,

    first of all: thanks for the screenshot - this usually helps a lot!

    Currently the implementation of the DropCutter always creates non-vertical lines. It just computes the height of the model at each position of a xy grid. The connection between two adjacent points with a different height is necessarily non-vertical.

    Can you think of a better approach? The current implementation schould be quite usable for natural shapes, but it is not sooo great for models with a lot of orthogonal corners.

    Alternatively you should run the ContourCutter before - then you won't notice the non-vertical line (through the air) in the second part of the program (DropCutter).

    cheers,
    Lars

     
  • flatline

    flatline - 2010-09-09

    Hi Lars,

    Ok, I understand. I realized that when I go for a higher percentage overlap, the grid is finer and the angle is much steeper.

    But your hint with the contour cutter is good. I will try this.

    To solve this "problem", I think the best way is to refine the grid when the difference in Z of two point next to each other is to big.
    Anders Wallin has som good explanation on his page. http://www.anderswallin.net/2010/03/octree-in-python/

    cu Michael

     
  • flatline

    flatline - 2010-09-09

    Worked quite well. For doing this with an old 8mm metal-drill, the result is excellent.

    Thanx for this amazing software. Now I can do everything on my MAC and don´t have to deal with Windows. :)

     

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