1. #1
    I want to create some core drills for a project with various grades of diamond powder and was wondering what you would recommend for attaching it to the end of the drill bit.
    I've looked at diamond brazing rods but they are as rare as rocking horse shit.
    Also thought of casting some tough RTV silicone caps with the powder in. I may have a bash at that some day.
    So the idea is to to mix in the powered diamonds to a something, then dipping the end of the tube in it and hopefully it will set hard enough not to crack off the pipe whilst machining.

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  2. #2
    It's conventional to use brass tube, a dam around the work and a fluid to carry diamond for core drilling if you don't have industrially bonded diamond core drills.
    Diamond on commercial core drills is in a metal carrier because that's the only thing that won't easily fracture and break off when it's placed under cutting loads.
    You think that's too expensive? You're not a Model Engineer are you? :D

  3. #3
    Quote Originally Posted by magicniner View Post
    It's conventional to use brass tube, a dam around the work and a fluid to carry diamond for core drilling if you don't have industrially bonded diamond core drills.
    Diamond on commercial core drills is in a metal carrier because that's the only thing that won't easily fracture and break off when it's placed under cutting loads.
    I was thinking of looking into sinter-ing .. but it needs high heat. Its not a cutting load it more a grinding load. Love to know how they make diamond braising rods lol anyway it a while off just getting ideas. Thanks for the reply

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  4. #4
    Quote Originally Posted by Fivetide View Post
    more a grinding load.
    Like making spheres from rock with 3 cutters?
    You think that's too expensive? You're not a Model Engineer are you? :D

  5. #5
    Quote Originally Posted by magicniner View Post
    Like making spheres from rock with 3 cutters?
    exactly :) I have some steam pipe expanders like the hobbyists use (like me)Ill fill them will car body filler, shape them on a cricket ball then epoxy Velcro on and use cut of pieces of grinding pads to start off . it may be all I need , just exploring other ways that's all :)

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    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  6. #6
    Diamond is heavy, in a wet environment you can separate it from almost anything else, including rock particles with a liquid cyclone.
    All you need is cups with a softer material like brass which will carry the diamond to act as a lap while it abrades the rock surface, with spiral face grooves to allow liquid flow across the surface form outside to centre and then you recycle the Diamond and some liquid to feed in to the top of the system, your Diamond is then only scrap when it becomes too fine to recover.
    You think that's too expensive? You're not a Model Engineer are you? :D

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