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Issue with outside cut and rad bone multi inside

Discussion in 'SketchUcam Bugs' started by pappabj0rn, Dec 28, 2014.

  1. pappabj0rn

    pappabj0rn New Member

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    Hi!

    I've run into an issue while doing some small parts that I want to use the rad bone tool on.

    I'm using a 3mm bit to cut out an H-shape, but when I use the rad bone multi inside tool with tool diameter set to 3mm, the outside cut tool fails to generate the white area and thusly no g-code is generated for that cut.

    At first, I was trying to cut my parts using a 1mm bit, and I could use the bone tool with no issues (tool diameter set to 1mm), so I find it odd that it would break at 3mm. And I also think I've been able to use bones + outside cut (both set to 3mm), but I can't get it to work now. I can't recall doing anything different then.

    I've attached a simple example skp with out the bone tool applied, and an image showing the result with the bone tool and outside cut applied.

    A workaround I've found is to set a slightly larger tool diameter for the bones tool, which I'll do in the future, but I don't think that's the expected behaviour.

    The ruby conslole does not give any arror message.

    Sketchup 2014 + Sketchucam 1.2a
     

    Attached Files:

  2. ewo

    ewo Moderator Staff Member

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    Sorry my last post didn't work well so i edit it

    Read the help file The big blue ? mark.
     
    swarfer likes this.
  3. swarfer

    swarfer Moderator Staff Member

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    Using a larger bone diameter than the tool bit is DOCUMENTED in the help.
    It has to be this way, and is indeed 'forced' when you use the phlatbone tool diameter dialog, it sets the diameter larger than the current tool bit by an amount that usually works (for smaller bits you may need to increase it manually).

    Why? because if it uses the exact tool diameter then the offset lines that are used for the cut overlap, and it cannot generate Gcode for overlapping lines since Sketchup automatically simplifies them into a single shortened line that breaks the loop.
     
  4. pappabj0rn

    pappabj0rn New Member

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    Yeah, I've found the documentation after having fiddled with it for some time, should have checked it earlier. I'm at work now so I haven't got it in front of me, but I think I read that the tool will use a slightly oversized cutaway because of the reason you've stated. If so, then this shouldn't be an issue.
    But, I don't think there is any issue with the bone tool, rather the outside cut is behaving weirdly some times.

    Before I had managed to workaround my problem, I tried doing the bones by hand. I used a circle with a diameter of 3.1 mm and placed it at the corners, and then removed the original corner. This worked - for one of the parts.
    Using the same tecnique on another shape gave me the same error as before.

    The no_white.png I attached earlier is a bit too zoomed out to show it, but the corner cut lines aren't overlaping.
    Is there any way for me to log or debug what is happening when I use the outside cut tool? Maybe I could just add some tracers that will give me something to look at in the ruby console.

    I'll have a look at the code and try to reproduce a failing example.
     
  5. swarfer

    swarfer Moderator Staff Member

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    I have now had a chance to load your file into sketchup2014 and I see your problem.

    you are trying to do an outside cut on a shape that is inside an existing area (the big rectangle).
    just delete the big rectangle, leaving the H shape. apply the outside cut to the H shape and you should get what you want.

    if what you want is a large rectangle of material with an H shape cut out of it, then you need to draw the H shape larger and use an inside cut to cut it out.

    make sense?
     
  6. pappabj0rn

    pappabj0rn New Member

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    Thank you for taking the time swarfer!
    I'm not sure why I draw the rectangle, for some reason I thought I had to. I've always done it, but as I clearly can skip it, I will. (It's just a representation of the material I'll be cutting into.)

    I found an interesting thing while doing some tests, which can be seen in the attached files.
    Starting of with a 25x25mm square, and progressively adding features to it, outside cut fails when I have two rectangles cut out with bones applied to them (3mm bone tool diameter).
    But, the last figure is ok, why is that? The thing that differs on the last figure is the the upper bone cuts was done with tool diameter set to 3mm, while the lower cuts are with tool diameter set to 3.1mm.

    edit:
    Oh yeah, using 3.1mm for both upper and lower bone cuts also works.
     

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    Last edited: Dec 30, 2014

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