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Tool randomly going deeper than simulation

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  • Tool randomly going deeper than simulation


    I am using fusion 360 to model a guitar neck. During 3d pocket milling of the back of the neck, the tool randomly digs about 1/8" deeper than it should for one path then returns to normal operation. I have no idea what is causing this, it doesn't seem to happen during parallel cutting or other operations, just pocket. If it was the machine losing count then it would have to "regain" count to resume as it does. Simulation in fusion360 does not show the cut that is in error. It looks like its following the right x, y path but just screws up the z temporarily.

    What is causing this? Machine runs fine before and after. I have a stinger 1 and I am using the post processor that comes with fusion360.

    sr-24 w/ gantry lift, FTC, 1kw spindle
  • #2

    Can you check the z values in the tap file in the problem location? I suspect they might be lower than expected.
    Charlie L
    Stinger II, 48 by 48, 1.7 kW Spindle, FTC + Laser + Recoil + Vacuum, July 2012
    WinCNC 2.5.03, Aspire, PhotoVCarve, Windows 7 Pro SP1

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    • #3

      as charlie suggested -
      does fusion have a "preview toolpath" feature where it will animate the cutout of the part? sorry not familiar with fusion, just grabbing at straws here.

      if it does, you may be able to slide the mouse around the area that the deep cuts occur and see if the same (deeper) cuts were in the toolpaths. if they aren't there, i suspect that they are in the hardware...
      Panther PT-404 (aluminum)
      6 position ATC w/5hpHSD, Aspire 11/WinCNC, Recoil, Laser, Hurricane
      near bottom of the learning curve!!

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      • #4

        I'm new to CAM but I do use Fusion. Which pocket operation are you using?

        I have a similar behavior while using a morphed spiral. At the very end, the bit plunges to Z0. Sorry to say I haven't looked into it because it's not doing any harm. One thing to note though, is I do see it in the simulation and the toolpath in Fusion, so take a closer look.

        If I needed to get rid of it I would probably look at the Avoid Touch Surfaces settings for the path and/or the Tool Containment and Contact Point Boundary settings under the geometry tab. Like I said, I'm still figuring this all out myself so I don't know if those will do the trick but it's where I would start looking.

        - William
        Cobra Elite 408, ATC, 5 hp spindle, vacuum table, 4th axis, Fusion 360

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        • #5

          Originally posted by William View Post
          I'm new to CAM but I do use Fusion. Which pocket operation are you using?

          I have a similar behavior while using a morphed spiral. At the very end, the bit plunges to Z0. Sorry to say I haven't looked into it because it's not doing any harm. One thing to note though, is I do see it in the simulation and the toolpath in Fusion, so take a closer look.

          If I needed to get rid of it I would probably look at the Avoid Touch Surfaces settings for the path and/or the Tool Containment and Contact Point Boundary settings under the geometry tab. Like I said, I'm still figuring this all out myself so I don't know if those will do the trick but it's where I would start looking.

          - William
          3d pocket clearing, but there is no option for Avoid Touch Surfaces from what I see like on other methods.
          sr-24 w/ gantry lift, FTC, 1kw spindle

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          • #6

            Originally posted by kt88saturate View Post

            3d pocket clearing, but there is no option for Avoid Touch Surfaces from what I see like on other methods.
            Did you get this figured out? You might also try setting the bottom height to bottom of your pocket
            Cobra Elite 408, ATC, 5 hp spindle, vacuum table, 4th axis, Fusion 360

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            • #7

              Originally posted by William View Post

              Did you get this figured out? You might also try setting the bottom height to bottom of your pocket
              I just redid all the dust collector hose grounding this week. I had insulated wire spiraled around the hose but now I've switched to bare wire with a ton of zipties to keep it in contact with the hose.

              I looked through the project toolpath thoroughly but did not see any issues during simulation. I also looked at the toolpath in a gcode previewer to confirm, looks great. I am going to run some long toolpaths tonight and tomorrow to see.
              sr-24 w/ gantry lift, FTC, 1kw spindle

              Comment

              • #8

                It should be a bare wire and it needs to be inside of your hose. It will help a little outside of the hose but it can effectively "grab" the static if it is inside.

                https://www.camheads.org/forum/new-c...lection?t=8650
                4'x8' Stinger IV w/ 4.2 hp spindle and 4 tool ATC
                Mister system
                Phenolic Vac table
                Hurricane Vac
                Vcarve Pro 10



                Catholic school IT director, wannabe woodworker, Krav Maga instructor, and CNC enthusiast

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                • #9

                  Originally posted by Logan Y View Post
                  It should be a bare wire and it needs to be inside of your hose. It will help a little outside of the hose but it can effectively "grab" the static if it is inside.

                  https://www.camheads.org/forum/new-c...lection?t=8650
                  Fantastic. Key details I am missing.
                  sr-24 w/ gantry lift, FTC, 1kw spindle

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                  • #10

                    I followed the video from Logan's post and went through 20 hours of tool path without issue.

                    I ran a grounded bare copper grounding wire with two loops a foot on the outside of the hose, with another wire on the inside.

                    So far, so good. I don't foresee any issues as I have not been able to run for more than ~5 hours before having an issue.

                    Probably going to put the dust collector collection bag inside of a grounded metal trash can as well. I wrapped copper around it and could feel the static dissipate immediately.

                    I can fully confirm running an insulated wire around the outside does not work. :/ I was beginning to question whether or not the ground rod at my house was sufficiently buried. I might check that anyways.
                    Last edited by kt88saturate; 08-08-2021, 09:42 AM.
                    sr-24 w/ gantry lift, FTC, 1kw spindle

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