Compound mitre joints on a CNC. Help


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Thread: Compound mitre joints on a CNC. Help

  1. #1
    branrichards's Avatar
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    Default Compound mitre joints on a CNC. Help

    Hello all,
    I want to make a 4 sided pyramid out of plywood (I attached a picture to illustrate). The pyramid in the screen shot is just there to demonstrate the shape, its the sides layed out that i want to mill, I also attached a picture of the CAM hoping that better explains. I'm hoping i will be able to construct the pyramid using the panels, im essentially "hoping" to use the my cnc to cut compound mitre joints.

    Wondering if anyone had any input on the best strategy for achieving this, I had an attempt and it didn't work well i got a fair amount of smoke before aborting ...ha, I tried using a 2 flute 6mm ball nose endmill.

    I ran 1600 Rpm
    2500 mm/min feed
    1mm Depth of cut (about 15 passes)
    2 flute 6mm ball nose endmill

    Im also aware i may be asking to much from a cnc mill and may need to make this on my table saw but given the joints dont have to be perfect i thought i would try it, even if there is a bit of sanding evolved so the edges join nicely it would still advantageous

    Thanks for reading hoping someone might steer me in the right direction



  2. #2
    Member routalot's Avatar
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    Default Re: Compound mitre joints on a CNC. Help

    No picture showing.It isn't that difficult a task with the right software.Model the pyramid with the correct panel thickness,separate the individual panels with the joint surfaces and generate the program to cut them.You will need a packer beneath the panels when they are being machined or the ball end mill will be cutting some grooves in your table.You may need to machine joint faces one at a time if you need to leave clamping arrangements in place.



  3. #3
    branrichards's Avatar
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    Default Re: Compound mitre joints on a CNC. Help

    I not sure why my attached picture never show up






  4. #4
    Member ger21's Avatar
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    Default Re: Compound mitre joints on a CNC. Help

    Is that 1600 rpm, or 16,000?

    1600 is not going to work.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

    JointCAM - CNC Dovetails & Box Joints
    [URL]http://www.g-forcecnc.com/jointcam.html[/URL]

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  5. #5
    branrichards's Avatar
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    Default Re: Compound mitre joints on a CNC. Help

    Quote Originally Posted by ger21 View Post
    Is that 1600 rpm, or 16,000?

    1600 is not going to work.
    16,000 sorry typo



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Compound mitre joints on a CNC. Help

Compound mitre joints on a CNC. Help