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Thread: countersink bit for mdf

  1. #1
    Join Date
    Jan 2010
    Location
    Regina
    Posts
    24

    Default countersink bit for mdf

    Just wondering what everyone is using for a countersink bit for mdf/melamine
    that you don't have to sharpen all of the time. LV's any good? Assuming you get what you pay forhttp://www.leevalley.com/wood/page.a...240,42281&ap=1

    Already have a stanley/ryobi set, looking for a decent one for #8 screws, suggestions? (other than give up on mdf/melamine and use real wood)

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  3. #2
    Join Date
    Jan 2009
    Location
    South Surrey, BC
    Posts
    605

    Default Re: countersink bit for mdf

    I sometimes use a 1/4" radius half round router bit.

  4. #3
    Join Date
    Feb 2006
    Location
    Ottawa
    Posts
    783

    Default Re: countersink bit for mdf

    I've been using the carbide countersink I got from Danny Proulx (sadly now deceased), however the business carries on. Under bits and blades here http://www.cabinetmaking.com/pages/hardware.htm. You could likely get it directly from Sharpco as well. They last a very long time unless you drop them on concrete floors, breaking the carbide. I've drilled thousands of holes with mine (second one) and it's still sharp. FWIW.

  5. #4
    Join Date
    Feb 2006
    Location
    Northern Kentucky, USA
    Posts
    2,517

    Default Re: countersink bit for mdf

    I have drilled thousands of counterseats with a HSS bit w/o dulling. Especially in MDF. When I am countersinking I do the countersink before the drilling the hole, As you (I assume) know where the hole is to be, it is no problem to set up ad drill the counterbore first, this eliminates the chatter created when you drill into a hole, making a smooth tapered divit. Then when you set up to drill the hole it is easy to find the center and follow through (point it down the funnel) Often it is assumed that the bit is dull because of the chatter bt a slight off center of the countersink to the hole will create vibrations and resulting lines or out of round in the countersink. I always Countersink first and drill second.

    That's the way I approach it.
    Bill "Hickory" Simpson

  6. #5
    Join Date
    May 2009
    Location
    Orleans, Ontario
    Posts
    1,985

    Default Re: countersink bit for mdf

    Quote Originally Posted by Scistore View Post
    Just wondering what everyone is using for a countersink bit for mdf/melamine
    that you don't have to sharpen all of the time. LV's any good? Assuming you get what you pay forhttp://www.leevalley.com/wood/page.a...240,42281&ap=1

    Already have a stanley/ryobi set, looking for a decent one for #8 screws, suggestions? (other than give up on mdf/melamine and use real wood)
    I have a set of those that I got from Home Hardware years ago (Vermont American) and they work fine. I do not use them every day but I do use them in MDF fairly frequently with no particular dulling that I have noticed. I bought other countersinks from LeeValley that I use in my drill press only; http://www.leevalley.com/hardware/pa...3,41306,41328; they are very good tools IMHO and are similar to the deburring tools that I have for metal working.

    Ken in Ottawa

  7. #6
    Join Date
    Jan 2010
    Location
    Regina
    Posts
    24

    Default Re: countersink bit for mdf

    Thanks Jack, that Dimar bit is what I'm looking for. I have a bit of carpel so I'm using some lightweight 12v Ryobi drills and those cheaper bits can become more of a strain as they dull out.

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