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  1. #281
    Member Project_Hopeless's Avatar
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    Question Re: Router Bits and EndMills: Pictures, Descriptions, and Uses

    I have a DIY CNC router that is speed limited running 5mm lead ball screws. So plenty of torque limited speed.

    My immediate need is to cut plywood up to 3/4", both softwood and hardwood including marine grade.

    My router is a 2-1/4HP with a min speed 8000rpm. So from my understanding I'd probably want a 1/4" single flute carbide cutter to maintain a decent chip load.

    Is my understanding correct?

    Second, I searched Ebay for Onsrud and a lot of single flute cutters come up labeled for aluminum. Are these suitable for plywood and other woods?



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    Default Re: Router Bits and EndMills: Pictures, Descriptions, and Uses

    How fast can the machine actually cut? At 8,000 rpm, you're fine to use a 2 flute bit.

    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: Router Bits and EndMills: Pictures, Descriptions, and Uses

    Quote Originally Posted by ger21 View Post
    How fast can the machine actually cut? At 8,000 rpm, you're fine to use a 2 flute bit.
    Not sure. I hope to power up for the first time this weekend.

    Embarrassingly, if my calcs are right, ~50-60 ipm. If I had 1/2 the inductance and twice the lead I'd be 200-300 ipm territory. For the time being I have to make due with what I have.

    With that in mind would you still recommend 2-flute cutters?.



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    Default Re: Router Bits and EndMills: Pictures, Descriptions, and Uses

    My understanding is with a compression bit you need a depth of cut that engages the down spiral with the top surface, So for example a 1/4" tool, 3/8- 1/2" (~7-10mm) deep cut.

    For Birch plywood, would you recommend using a compression bit on a DIY hobby machine?



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    Default Re: Router Bits and EndMills: Pictures, Descriptions, and Uses

    Yes, I'd still use a 2 flute bit.Unless you can easily find inexpensive single flute bits for wood. The "O" flute bits for plastic and aluminum will work OK for wood, but they tend to be expensive.

    I don't use compression bits on my DIY machine, because I don't really need them. They work best when making one full depth pass. If you make multiple passes, you'll wear out the tip a lot faster.

    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: Router Bits and EndMills: Pictures, Descriptions, and Uses

    I'm looking for an economical spoil-board surfacing bit/cutter. I came across this one.

    https://www.grizzly.com/products/Gri...xoCPaAQAvD_BwE

    Can I do better than that bit for similar money? I have a 48x48" table and 2Hp router so I was thinking 2' cutter 1/2" shaft.



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    Default Re: Router Bits and EndMills: Pictures, Descriptions, and Uses

    I use this one.

    https://www.amazon.com/Magnate-Surfa...222962&sr=8-15

    But that grizzly looks decent, and it is cheap.



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    Default Re: Router Bits and EndMills: Pictures, Descriptions, and Uses

    Any straight bit will work, and you probably won't find a 2" bit for less than $25.

    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: Router Bits and EndMills: Pictures, Descriptions, and Uses

    For 3/4” plywood you want to use a 7/8 or 1” long bit correct?

    Or does a typical 3/4” spiral up or down cut bit have enough edge for cutting and chip clearing?



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    Default Re: Router Bits and EndMills: Pictures, Descriptions, and Uses

    Yes, 7/8 or 1".
    Since most plywood is undersize in thickness, you can usually get away with a 3/4" bit, but a little longer is better. The flutes on a spiral bit extend beyond the cutting edges, so that's not an issue.

    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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Router Bits and EndMills: Pictures, Descriptions, and Uses

Router Bits and EndMills: Pictures, Descriptions, and Uses