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IndustryArena Forum > WoodWorking > General WoodWorking > Router bit edge shape for V groove tool?
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  1. #1
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    Router bit edge shape for V groove tool?

    Wanting to Vgroove mill some low cost material that will be painted - rosettes for door/window frames. The commercial ones are out of pine I think. Have a small desktop cnc mill and tried it with a cheap HF Vgroove router bit. The wood was so-so and the result was horrible. Looking at the bits edge it has a slight reverse taper so no cutting edge at all. Think the bit came that way - haven't used it much that I recall.

    Forget where I read it but apparently this is how some bits are made. Seems like I should have a sharp edge for a smooth finish. What speeds and feeds should I be using? I used about 8000 because that's the highest speed I can in low speed range and was concerned with torque in the high speed although in soft wood it should be fine for torque. Have cut aluminum in low speed range with no issues (with end mills).

    If I double the RPM and double the feed rate with the finish improve? I had slowed the feed rate so thought that compensated for the lower RPM but could be wrong.

    I am including a few pics of the bit. In third one you can see the slight reverse slope area on the leading edge of the cutter.

    This is not production - just a small project to do about 6 pcs for my own use. I know I probably need to buy a better cutter but don't want to spend $70 for a tool with replaceable edges so something like that if it was a production job.

    Attachment 444770
    Attachment 444772
    Attachment 444774

  2. #2
    Community Moderator Jim Dawson's Avatar
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    Re: Router bit edge shape for V groove tool?

    The Diablo bits from Home Depot seem to work pretty well, I use these in all materials including metals up to tool steel and stainless. Also Router Bit World sells high quality bits https://www.routerbitworld.com/
    Jim Dawson
    Sandy, Oregon, USA

  3. #3
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    Re: Router bit edge shape for V groove tool?

    Do good quality V goove bits actually cut a accurate point at the bottom of the V? I realize there will probably be a small radius but some I have seen put a small flat at the bottom. Leaves about a 0.050" well defined flat spot at the bottom and cuts into the side slopes making it even more noticeable. This ones a CMT. Was only $11 so I guessing this isn't a high quality brand although I did see them on router bit world. Need to try the one Jim recommended from HD.

  4. #4
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    Re: Router bit edge shape for V groove tool?

    Something I learned the hard way when trying to engrave text with a 90 degree bit with a flat tip and the letters were wrong in the corners.You absolutely have to find engraving bits that have a sharp tip and they don't have to cost very much.I have bought several from ebay with tip angles from 20 degrees to 150 degrees.

  5. #5
    Community Moderator ger21's Avatar
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    Re: Router bit edge shape for V groove tool?

    Either of these will work much better than what you have.
    https://www.amazon.com/Yonico-14990q...3430486&sr=8-2

    https://www.amazon.com/Freud-Dia-Gro...MGYCKSFAW2HE5R

    https://www.amazon.com/CMT-815-690-1...11&s=hi&sr=1-8

    You'll usually get a better finish when cutting slower. Try increasing the rpm with the same feedrate.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

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

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

  6. #6
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    Re: Router bit edge shape for V groove tool?

    Thanks! I looked on ebay and lots of orange asian bits for around $4. No mention of carbide. Thinking I should get carbide if it isn't to pricey. Shafts are 6 mm. I need the bit to be at least 5/16" at the top and most are over an inch so that's fine. Only have inch size collets - should I get some metric for flexibility and what sizes are common? WW collets so am limited to about 5/16".

  7. #7
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    Re: Router bit edge shape for V groove tool?

    You should find lots of carbide tipped bits at modest prices is you look around.6mm shanks will fit a 1/4" collet You will occasionally find an 8mm collet but they are very rare.

    https://www.ebay.co.uk/itm/1-4-V-Gro...MAAOSwnNBXY8WM

    https://www.ebay.co.uk/itm/90-Degree...kAAOSw5UZY9lkO

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