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Problem milling round holes!

Discussion in 'OpenBuilds Bug Report' started by Kaj H. Nielsen, May 18, 2021.

  1. Kaj H. Nielsen

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    I will make 8mm. hols with a 6mm. mil, but they are not round.
    My machine is controlled by Black Box which is connected to a PC or Interface, but with the same result.
    Where and how can I fix the problem?
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Mechanical. Loose "something". Hold endmill, give it a wiggle. Follow unwanted movement, and tighten the source of the wiggle
     
  3. Alex Chambers

    Alex Chambers Master
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  4. Kaj H. Nielsen

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    Hi Peter,
    I have to keep going because I work there, but do not think I can get an OK result.
     
    #4 Kaj H. Nielsen, May 18, 2021
    Last edited: May 18, 2021
  5. Kaj H. Nielsen

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    Hi Alex,
    I think I have to go in there ,
    I have not tried it yet.
     
  6. Gary Caruso

    Gary Caruso OpenBuilds Volunteer
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    Post your settings a test file here, could be settings or the drawing might be turning circles into hexagons for example.

    Cheers
    Gary
     
  7. Kaj H. Nielsen

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    Hi Gary

    When I mill these 8mm. wholes they all have the same shape, but not round.
     

    Attached Files:

  8. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Post a photo of the cuts too.
     
  9. Kaj H. Nielsen

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    DSCN2259[1].JPG DSCN2260[1].JPG the bottom whole is the problem.
     
  10. Gary Caruso

    Gary Caruso OpenBuilds Volunteer
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    On Estlcam preview they don't look like circles and they are broke up into segments.
    Cheers
    Gary

    upload_2021-5-18_16-17-1.png
     
  11. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Indeed, GCODE after all:

    What CAM are you using?

    upload_2021-5-18_22-42-20.png
     
  12. Kaj H. Nielsen

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    I use DeskProto
     
  13. Palle Iversen

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    Hallo
    Det samme sker i VCarve Pro.10.5, der genereres ingen runde huller.

    Palle Iversen
     
  14. A.J.W.E. Klappe

    A.J.W.E. Klappe Well-Known
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    Hey It is not Deskproto that causes this problem, but your drawing program. I myself have been using Deskproto for four years now. It is comprehensive and easy to learn. Good luck. Bert
     
  15. Kaj H. Nielsen

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    Nice to know Bert, I'm new to DeskProto, but well satisfied.
    I use Dev Wing Mold as a drawing program, for glider wings and the small 8mm. holes are for guide pins in the molds,
    therefore it is important that they are precise.

    And I see that Palle have the same problem in VCarve.
     
    #15 Kaj H. Nielsen, May 19, 2021
    Last edited: May 19, 2021
  16. Gary Caruso

    Gary Caruso OpenBuilds Volunteer
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    Is there a way to mark centers and call out the hole size in the cam? some cam programs can do this.
    Gary
     
  17. A.J.W.E. Klappe

    A.J.W.E. Klappe Well-Known
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    Hello Kaj,

    You should actually give Inkscape a try. It is free to download from www.inkscape.org and is a very good program. I use it for all my drawings and I have already made about 500 with it. By the way, you can also use this to convert an image from the internet to a vector that you then convert in Deskproto to a Gcode. Give it a try.
    Good luck
    Bert
     
  18. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Please post in a new thread, as your issues may be different. Vectric does a steller job, so far more likely mechanical
     
    Palle Iversen likes this.
  19. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Post your original CAD file so we can see if the drawing, or cam setup, introduced error
     
  20. Kaj H. Nielsen

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    Here a screenshot of the a hole from DeskProto,
    it seemes ok --or! because the result is like the picture from Gary.
     

    Attached Files:

  21. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Are you drawing in DeskProto directly then. Not a DXF import or similar?

    In that case, check what Post you are using, and its parameters. Why is it exporting circles as G1 segments instead of G2/3 Arcs, etc
     
  22. Kaj H. Nielsen

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    CAD+CAM files
     

    Attached Files:

  23. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    So the above doesn't answer the question, but can we assume the STL is imported?

    Because the STL holes (as all STLs are based of triangulated segments) does not contain round holes. Its segments, at a very low resolution:

    upload_2021-5-19_16-39-39.png
     
  24. Kaj H. Nielsen

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    Is that understod right Peter,
    that STLs can not make round holes, when exported to the DeskProto CAM?
     
  25. A.J.W.E. Klappe

    A.J.W.E. Klappe Well-Known
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    Hello Kaj / Peter,
    you cannot draw in Deskproto.
    You can import DXF files or grayscale images. From there you can then create your Gcode. If you use Inkscape you get a clean round hole instead of a segmented hole.
    Bert
     
  26. Kaj H. Nielsen

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    Thanks for all the inputs.

    Will bee back when I can mill round holes in my plugs.
    It does not look easy as I construct my wings in devWingMold.

    Kaj
     
  27. Gary Caruso

    Gary Caruso OpenBuilds Volunteer
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    I think he is carving 3D molds for glider wings, would be difficult to do in inkscape..
    BTW many options for accurate dimensional 2D drawing out there (free as well). I'm using NanoCAD because I learned 30 years ago how to use autocad so this was no learning curve.
    As for the perfect round hole, it is just a matter of having enough segments that the pin will fit.
    Cheers
    Gary
     
  28. Kaj H. Nielsen

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    Has now fine adjusted GRBL.
    And the result is seen on attachment. 100mm.x100mm. and Ø60 is on target, (this is where the adjustment is made) but 30x30mm and Ø8mm are not. ??
    It is on two different drawings
    100x100 and 30x30.
     

    Attached Files:

  29. Kaj H. Nielsen

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    I promised to be back when I managed to mill round 8mm.holes.
    Attached are 1 file showing how it can be done in DeskProto CAM.
    4mm. mill and as small values, in "Distance between toolparths" and "Stepsize along toolparth", as possible.
     

    Attached Files:

    #29 Kaj H. Nielsen, Jun 14, 2021
    Last edited: Jun 14, 2021
    Giarc likes this.

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