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CNC 3018 PCB drill bit break

Discussion in 'CNC Mills/Routers' started by Chris Van Gewden, Sep 7, 2021.

  1. Chris Van Gewden

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    Good day everyone,

    I ask for help with my CNC 3018 PCB board milling.

    I’m new to CNC 3018 as beginner. I tried mill for PCB to made own Diy Z probe from YouTube,

    YouTube link:
    but PCB End Mill break,

    I downloaded Z probe from this link, I opened fusion 360 and save as NC file for UGS.

    I successfully tested to mill on wood with V cutting bit, the I started mill with PCB mill bit size is 0.8mm, but it don’t cut the PCB board deeper. I tried to made deeper and it is worse to cut and PCB ugly look.

    Check attached files to see picture of damaged PCB mill bit and board.


    [​IMG]
     

    Attached Files:

  2. Rob Taylor

    Rob Taylor Master
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    0.8mm is an extremely small tool- very fragile and very little chip evacuation. Probably only good for cutting out copper traces on PCBs, not for actually milling FRP.

    Start over from the CAM step with a 1.5 or 2mm end mill and it should be more successful- assuming your feeds and speeds are correct, which shouldn't be hard to look up for FRP.
     
  3. Chris Van Gewden

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    What does FRP stand for?
     
  4. Giarc

    Giarc OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    I believe it is Fiber Reinforced Plastic. But maybe I am wrong.
     
  5. Christian James

    Christian James Journeyman
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    Not sure I understand you fully Chris but are you trying to route a PCB using a regular 0.8mm straight shaft cutter? What you need is a V shaped tool, perhaps 30 degrees with say a 0.2mm tip if you want to route a pcb.
     
  6. Rob Taylor

    Rob Taylor Master
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    Indeed. AKA, fiberglass. The stuff PCBs are made out of, assuming you're using a standard FR4 board and not something else.

    He wants to cut full-depth shapes out as well as isolate a solder pad, from the looks of the video thumbnail.
     

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