what causes this issue when cutting wood

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    Default what causes this issue when cutting wood

    so im cutting 6mm plywood cirlcles(4x4") and im using the poor mans compression bit trick, im using a double fluted down cut bit to get through the top half and then a double fluted upcut to finish and im getting hairs in the middle of my cuts and dont know how to solve this problem

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    Default Re: what causes this issue when cutting wood

    Why are you switching bits mid-cut? Most people use the same one for the whole thing; have you tried that? It seems that the cut quality might have something to do with the change-over.

    [FONT=Verdana]Andrew Werby[/FONT]
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    Default Re: what causes this issue when cutting wood

    i switch between a downcut and upcut bit to imitate a compression bit, im trying to cut coasters that are printed on and need very little chipping on the top and bottom, which is working pretty well, but now for some reason hairs stay in the middle



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    Default Re: what causes this issue when cutting wood

    Maybe the upcut is slightly smaller?

    Gerry

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    Default Re: what causes this issue when cutting wood

    the bits are identical, except for the cut direction, W2-418 D/U from cut guru



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    Default Re: what causes this issue when cutting wood

    Quote Originally Posted by bzen View Post
    the bits are identical, except for the cut direction, W2-418 D/U from cut guru
    There could be a slight difference from the factory. Tolerances do shift in the manufacturing process, and since they are "up" and "down" cut bits, they were more than likely made on different machines or at least different times.

    Juan


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    Default Re: what causes this issue when cutting wood

    i didnt think about it like that, is there something i can do to check for it being different sizes? besides the possible difference in sizes are there any other things that could be causing it?



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    Default Re: what causes this issue when cutting wood

    What if you cut a little deeper or shallower with the downcut?

    Gerry

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    Default Re: what causes this issue when cutting wood

    i tried changing the depths on the initial cut and that didnt fix it so im really at a loss right now



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    Default Re: what causes this issue when cutting wood

    It could just be the quality of the material you're using. It looks like the fuzz is at the joint between 2 layers? Could just be a poor glue joint? Or does it happen on multiple sheets?

    So, say you cut deeper than where the fuzz is with a downcut, then you should see the fuzz before you even run the upcut bit.
    If the fuzz is appearing only after running the upcut, than my guess is that the upcut is a smaller diameter.

    Gerry

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    Default Re: what causes this issue when cutting wood

    yea when i run multiple passes with just the downcut bit there is no fuzz, so im the thinking the smaller diameter is it, any tips for how to cut these coasters with as little chipping as possible with out using a compression bit



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    Default Re: what causes this issue when cutting wood

    I would duplicate your setup with the same bits on scrap material. Try using different cutter comp on one of the bits until you either eliminate the problem, or make it worse. If the problem is like ger21 says, (which does sound logical) then adjusting the cutter comp on one of them should help isolate the issue to one of the bits.

    Juan


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    Default Re: what causes this issue when cutting wood

    so i was finally able to convince my boss to buy a compression bit, its a whiteside solid carbide compression bit, 1/4 cut 1/4 shank, can compression bits be plunged into the cut like the other bits, i have seen other posts about ramping into the cut and im wondering if that is something i have to worry about with a compression bit, i would like to avoid any potential failures if possible as this is my first time using a compression bit



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    Default Re: what causes this issue when cutting wood

    You shouldn't plunge with any bits, and I wouldn't recommend it, but yes, you can if you want to.

    Gerry

    UCCNC 2017 Screenset
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    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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    Default Re: what causes this issue when cutting wood

    whats the best way to start?



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    Default Re: what causes this issue when cutting wood

    I always ramp in along a lead in move.

    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)


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    Default Re: what causes this issue when cutting wood

    ok ill have to practice ramping in (if you have any tips for ramping i think you can tell im pretty new to these machines), everything i cut is either prepared for me in our digital department or i create a file in coreldraw x7, but i was under the impression that plunging into a cut wasnt bad for the bit as long as the material doesnt exceed the max material thickness of the bit



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