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Thread: Trying to get rid of tool marks, suggestions appreciated.

  1. #1
    Join Date
    Jun 2018
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    4

    Default Trying to get rid of tool marks, suggestions appreciated.

    I have used a 1/32" ballnose on my final pass with 12 spacing.
    attached in is an image showing the tool marks. Is the only way to smooth this out by decreasing my spacing which significantly increases my carving time?
    I would appreciate any thoughts.
    Thanks,
    Groovy
    Attached Images Attached Images

  2. #2
    Join Date
    Jan 2011
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    gleason, wi 54435
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    Default

    the extra time it takes to run a 6 percent stepover will be a lot less than the time it takes to fix it by hand and the result is better.

  3. #3
    Join Date
    Dec 2000
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    Thorp, WI
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    Default

    What size is the piece? A 1/32" ballnose is pretty small and the design doesn't have that much detail. 8% stepover works well for most ballnose bits that I have used. Don't use the "Offset" strategy, use raster and make it raster parallel to the gantry. 3D work requires a proper set of ramp values tailored to the task or you'll get axis "jiggle" and possible lost steps with a standard controller. Also, make sure you have no play in any axis, adjust and tighten up as needed.

    http://www.shopbotblog.com/2008/03/a...m-performance/

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  4. #4
    Join Date
    Mar 2004
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    Lenox High School, Lenox MA
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    This is a tip I copied from an older thread I hope it helps.
    Too much wasted time, just use the 3D roughing toolpath and use a 0.25" downcut end mill (not a ballnose) at 48-50% stepover with a machining allowance of 0.04" and up to 0.375 per pass depending on the quality of your end mill. Run it as 3D raster across the grain (keeps long slivers from plugging the dust foot). Then run the 3D finish toolpath across the grain as well with an 8% stepover. Done. You may think that a final finish pass across the grain will leave scoring, but with the proper tool and stepover, it will be fine and have a lot less fuzzies to clean up.

    Phil

  5. #5
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    Scott will forget more about 3-d then i will ever learn. That said I am curious about the size of your model. Do you know how to determine which size ball nose to use? It would not hurt to post a preview of you tool path. I typically use 8% stepover

  6. #6
    Join Date
    Mar 2004
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    Lenox High School, Lenox MA
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    882

    Default

    Quote Originally Posted by cowboy1296 View Post
    Scott will forget more about 3-d then i will ever learn. That said I am curious about the size of your model. Do you know how to determine which size ball nose to use? It would not hurt to post a preview of you tool path. I typically use 8% stepover
    The best way I have found to determine what size ballnose to use is with the toolpath animation. For example start with a .25" ballnose and follow up with a .125", slow the animation down so you can observe the difference. If necessary follow up with a .062." Experience will help.

    Phil

  7. #7
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    Feb 2010
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    yup that is exactly how i do it. And if the differance in the preview is not so great go with the larger bit, if it is great go with the smaller bit.

  8. #8
    Join Date
    Oct 2013
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    3rd rock
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    81

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    JMO, but it looks like it may be the model. The tool marks aren't symmetric, so the model might require some smoothing.

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