How to bury ferrules?

Discussion in 'Luthier's Corner' started by reverendrally, Dec 1, 2013.

  1. Having put off using them for so long, I gave in and finally went looking for some ferrules (not to be confused with 'ferals').

    When they arrived (in a record 6 days!) I then started trying to figure out how to put them in. They're 14.2mm in dia, to be precise. Initially I thought drill a 14mm hole in a router guide and using a pattern bit to make the recess would do the trick, but it was so tight, I had to hammer the ferrule in. If you look on the left at the pic below you can see what I had to do to get the ferrule out of the test piece... :rollno:


    Then I went looking for a 14mm router bit, but of course the local hardware doesn't have that. They have 12.5 and 16, but that's it. In my seaching I came across a 15mm forstner bit. You can see the ferrule has some space around it. This is what I'm concerned about.

    What I'm thinking is that space is ok, coz once I oil the body, I'll have a smaller hole and the ferrule should be snug, without being ridiculously tight like before. If this right approach or do I need to start again?
  2. tdogg

    tdogg Supporting Member

    Jan 17, 2001
    Brooklyn Park, MN
    I'm curious too....
  3. HaMMerHeD


    May 20, 2005
    Norman, OK
    It'll be fine. I use 15mm ferrules and a 5/8" (15.875mm) forstner bit to drill the recess. It is not necessary for the ferrule to be a press/interference fit. The screw's clamping pressure will keep it snug.
  4. Hopkins

    Hopkins Supporting Member Commercial User

    Nov 17, 2010
    Houston Tx
    Owner/Builder @Hopkins Guitars
    What you need for that particular ferrule is a 9/16" forstner or brad point bit. I don't know how easy it is to find non metric size drill bits where you live but that is the size you need.
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  6. Hi.


    If You don't mind the fact that people don't have to ask you whether you made it yourself or not it isn't.
    IMO anyway.

    OP, You have an access to a grinder of some sorts if I remember correctly?

    Just grind an appropriate forstner bit of the nearest larger size into the size You need/want.

    If You do both painted and oiled/waxed finishes, keep that in mind unless you want to grind two bits down.

  7. Smilodon

    Smilodon Supporting Member

    Feb 18, 2012
    drill a large hole in a sheet of "template material" and use a router with a collar to make the actual hole for the ferule.
  8. Harry Cahyadi

    Harry Cahyadi Commercial User

    Apr 11, 2013
    Clayton, VIC, Australia
    C Basses Owner & Builder
    As Hopkins mentioned 9/16" forstner is what you need.

    However, I'm fully aware that it is freaking hard to get fraction bits here in Australia, especially 9/16" in forstner shape. I have no idea why :-(

    What I did before was bought 9/16" brad point bit (bunnings or masters usually sells it as 14.3mm instead of 9/16"), got a 1/4" or thicker scrap mdf (if you use anything thinner, your ferrule holes will be too deep), using the bit, drilled a hole through. Used that mdf as my routing template with top bearing.

    All the best...

  9. DaanW


    Oct 21, 2008
    The Netherlands
    Just drill 14mm holes and then this:

    that's how I do it
  10. Hopkins

    Hopkins Supporting Member Commercial User

    Nov 17, 2010
    Houston Tx
    Owner/Builder @Hopkins Guitars
    What is funny is that its is almost impossible to find a 15mm forstner bit in the states. I had to use a brad point instead.
  11. mapleglo

    mapleglo Supporting Member

    Sep 7, 2013
    phoenix, az
    I did the same in my build.
  12. HaMMerHeD


    May 20, 2005
    Norman, OK

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