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drill bits

  • 10-03-2016 2:12pm
    #1
    geordief
    Registered Users, Registered Users 2 Posts: 475 ✭✭


    When I go to the hardware stores I see two kinds of drill -masonry and wood/steel.

    Ideally I would like a drill bit that was better than the masonry drill bits I see there (I ask if that is the best quality and they say "yes" )

    Online I can see there are diamond drill bits . Are these going to be a lot better?

    I have in mind to drill through cast iron and anticipate that could be tough. Do these diamond drill bits come in smaller thicknesses as if they do that would be an advantage to me?


Comments

  • #2
    Tiercel Dave
    Registered Users, Registered Users 2 Posts: 797 ✭✭✭Tiercel Dave


    You won't drill through cast iron with a masonry bit. How thick is piece that you are hoping to drill?


  • #3
    geordief
    Registered Users, Registered Users 2 Posts: 475 ✭✭geordief


    Tiercel Dave wrote: »
    You won't drill through cast iron with a masonry bit. How thick is piece that you are hoping to drill?
    it is about a quarter of an inch.


  • #4
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    Tiercel Dave wrote: »
    You won't drill through cast iron with a masonry bit. How thick is piece that you are hoping to drill?

    Well actually that's not true. High quality masonry bits will have a carbide tip. You can grind an edge onto the carbide and use it to drill stainless steel or cast iron.

    You can get carbide bits for drilling steel, but they are very expensive, hence grinding an edge on a good masonry bit makes sense.


  • #5
    sky6
    Registered Users, Registered Users 2 Posts: 1,444 ✭✭✭sky6


    You don't need to use Masonry bits to drill Cast Iron. Just get yourself a good quality HSS Drill bit and you will be fine.
    Cast Iron although tough is quite easy to Drill due to the high Carbon content.


  • #6
    dodzy
    Registered Users, Registered Users 2 Posts: 10,153 ✭✭✭✭dodzy


    geordief wrote: »
    it is about a quarter of an inch.

    Easiest way: 6-7mm good quality HSS bit. No point messing around with masonry bits and grinders.


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  • #7
    mfceiling
    Registered Users, Registered Users 2 Posts: 12,902 ✭✭✭✭mfceiling


    It's as much your drill as your drill bit. No point having the best drill bit in the world and putting it in a 12.99 drill from lidl.


  • #8
    dodzy
    Registered Users, Registered Users 2 Posts: 10,153 ✭✭✭✭dodzy


    mfceiling wrote: »
    It's as much your drill as your drill bit. No point having the best drill bit in the world and putting it in a 12.99 drill from lidl.

    For masonry, absolutely. Not so much for steel and even less so for wood. Bit quality is more important for the latter 2.


  • #9
    Steve
    Registered Users, Registered Users 2 Posts: 22,584 ✭✭✭✭Steve


    Cast Iron has a lot of carbon and self lubricates, use a hss bit dry at low speed and moderate pressure. Drill out in steps of 1-2mm


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