Diamond bits on plywood – vibrations

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This topic contains 6 replies, has 4 voices, and was last updated by  Sergey Drobyshevskiy 1 month ago.

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  • #46074

    I was cutting some wood and plywood with 1 flute simple bit and it was working fine.

    Some time ago I found that people prefer Diamond Bits for the plywood because they produce more clear cuts on the top. I tried a couple of bits (3.17, 2.4, and 2.1) but comparing to 1 flute 3.17 I am getting serious vibrations.

    Do you have any quess what is the reason and what am I doing wrong?

    My build is quite stiff, every single bearing is really tightened. But on these bits I am having very serious vibrations. The top of the part is better (no hair), but the cut itself is having slight wobble. (on the screenshot below left was cut by 1 flute, and right ones is Diamond 2.1mm)

    IMG_20171015_174340

    Sorry no luck to embed the video from YouTube – Video shows sound I get. Some resonance?

     

    #46084

    Ryan
    Keymaster

    Is the diamond bit a 2 flute? I think you just need to slow down your RPM’s, or cut deeper per pass.

    Do you have a link to the bit, I’m not sure what it is.

    1 user thanked author for this post.
    #46099

    Ryan, so sorry, due to some reason thought these are called diamond bits, but these are CORN type bits!

    Here is the lot: https://www.banggood.com/10pcs-11_522_53mm-Carbide-End-Mill-Cutter-PCB-Drill-Bits-p-1090388.html?rmmds=myorder

    Just noticed that price is a bit…mmm.. cheap, even for chinese made)) But the geometry looks fine

    Do you think what you said above could be right for these bits?

     

    P.S. I think I had around 10 000 RPM, and 1.5mm depth  that time

    #46148

    Bill
    Participant

    Those are drill bits, best for pushing down into wood and not so good for pushing sideways.

    #46157

    Hmm.. Are you sure you are looking at the right link? (or you’re referring to the name Chinese decided to give to the goods?)

    They do not look like a drill ones. I’ve heard they are used for the brittle materials like PCB, Carbon, and Plywood

     

     

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    #46166

    Barry
    Participant

    I wouldn’t use those for plywood, they’re really made for pcb(fiberglass) or carbon fiber panels.  The ones you linked to will gum up with wood and glue.  Plain old 1 or 2 flute endmills work best for plywood.  Plywood really is a shitty material to cut no matter what though.  The glues they use are really hard on the end mills.

    1 user thanked author for this post.
    #46168

    Thanks guys,

    Seems like I will forget about these, and will contunue to deal with 1 flutes… (and sleep well)

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