Blunting Masonry Drills

Discussion in 'Builders' Talk' started by DaveHerts, Oct 26, 2020.

  1. DaveHerts

    DaveHerts Member

    I am building a garden room and wanted to use 7.5mm concrete screws to hold it to the concrete base but I have tried 3 6mm masonry drill bits and all have blunted after 1 hole using my hammer drill. Is there a special drill bit I should be using or any tricks I am missing?
     
  2. Hans_25

    Hans_25 Screwfix Select

    Is it the drill bit or just an under powered drill? My Makita cordless is top notch but will struggle in concrete, for that I get the SDS+ drill out and it eats concrete like a knife through butter.

    What drill are you using?
     
  3. Wayners

    Wayners Screwfix Select

    Dewalt extreme masonry drill bits.
    Don't go too fast as there is an optimum speed for drilling and that's not fast or it rattles over and just gets hot..
     
  4. stevie22

    stevie22 Screwfix Select

    Keep pressure on bit.
     
  5. AnotherTopJob

    AnotherTopJob Screwfix Select

    Sometimes a smaller pilot hole first will help if a larger bit struggles.
     
  6. Mrboomal

    Mrboomal New Member

    Are you definitely using masonry bits?

    Masonry bits aren't really sharp to start with, so you can't really blunt them.
    Certainly not after 1 hole.

    If they are masonry bits, then make sure your drill is set to hammer and apply lots of pressure.
     
  7. DaveHerts

    DaveHerts Member

    thanks all. So I am using a mains powered Makita hammer drill and used a carbide tipped masonry bit. I am guessing I may have hit a stone in the concrete as it showed heat discolouration at the tip.
     
  8. Wayners

    Wayners Screwfix Select

    Go slower. Stone will not stop it but metal reinforced concrete will if you hit rod
     
  9. teabreak

    teabreak Screwfix Select

    SDS drill just be ready when it shoots through like butter you don't loose your balance!
     
  10. rogerk101

    rogerk101 Screwfix Select

    You're probably hitting a steel reinforcement bar in the concrete. Masonry bits will not drill through them.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice