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  1. #1
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,894

    Default Brierley drill bit grinder cams

    BaronJ's neat countersunk drill sharpening jig (see his thread, running now - //metalworkforums.com/f65/t2023...sharpening-jig)
    reminds me of the incomplete Brierley twist drill grinder I have here.

    The thing that prevents it being used is the lack of the cams, needed to generate the drill point shapes.
    They are not easy to find.

    Does anyone have a Brierley?
    If some dimensions could be obtained, maybe I could have a go at making the cams, or at least one of them.
    Alternatively, a lead to existing cams for sale would be great.

    Jordan

  2. #2
    Join Date
    Aug 2004
    Location
    Perth Western Australia
    Age
    65
    Posts
    203

    Default

    Here you go.
    https://www.gumtree.com.au/s-ad/elle...ams/1192863469
    If you need a pick up give me a PM.
    Mark
    I've become a tool of my tools.

  3. #3
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    35
    Posts
    1,522

    Default

    I would not have expected these to turn up so quickly!!

  4. #4
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Jordan,

    If you can't get the cams for your Brierley, I can recommend this

    https://www.gadgetbuilder.com/DrillSharp.html#Facet4

    I've built one, and I'm very happy with it !

    I only have one issue, if you are drilling brass or alloy, and pick up the wrong drill, they are so sharp, it will grab. I keep a number of drills just for brasses and alloys with the edge stoned off.
    Best Regards:
    Baron J.

  5. #5
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,894

    Default

    Thanks Mark,
    I sent an offer, see what happens.

    Jordan

    Quote Originally Posted by Poloris View Post
    Here you go.
    https://www.gumtree.com.au/s-ad/elle...ams/1192863469
    If you need a pick up give me a PM.
    Mark

  6. #6
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,894

    Default

    What's the largest drill bit this can handle?

    I've heard about too sharp a drill not being the best for brass.
    I have mostly brass type drill bits.

    Thanks,
    Jordan

    Quote Originally Posted by BaronJ View Post
    If you can't get the cams for your Brierley, I can recommend this
    https://www.gadgetbuilder.com/DrillSharp.html#Facet4
    I've built one, and I'm very happy with it !
    I only have one issue, if you are drilling brass or alloy, and pick up the wrong drill, they are so sharp, it will grab. I keep a number of drills just for brasses and alloys with the edge stoned off.

  7. #7
    Join Date
    Sep 2011
    Location
    Ballarat
    Age
    65
    Posts
    3,103

    Default

    Quote Originally Posted by nadroj View Post
    I've heard about too sharp a drill not being the best for brass.
    I have mostly brass type drill bits.
    Hi Jordan
    you are probably aware of this but it isn't that the drill is too sharp but that it has a positive rake.
    Brass should be machined with a neutral rake and so the rake is stoned off to attain that geometry. It doesn't need much just a couple of wipes with a stone, that way there isn't much grinding to get it back to a positive rake.

    Phil

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