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Using long drill bit at an angle to drill through masonry

Discussion in 'Decorating and Painting' started by Longshanks, 17 May 2021.

  1. Longshanks

    Longshanks

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    Hi

    I’d previously drilled a hole through an internal, load bearing wall (from lounge to conservatory) to connect aerial cable to tv. Cut long story short, had to widen hole a tad to allow new coax cable. Thought it would be easy with existing hole. However, the hole is only a few inches from the ground and a long drill bit needed as wall about a foot wide. I drilled, then realised to my horror, the bit had slipped in the wall and gone off on a tangent. The new hole is lower and to the right of original, and I thankfully stopped before it went through skirting board!

    What I also only discovered today was that the original smaller hole was drilled at an angle, with exit hole in conservatory higher than hole on other side. Think this was due to drilling at low level with a long bit. I’m assuming it’s a damage limitation job now, but would people advise drilling down rather than up with the bigger but?

    Thanks
     
  2. blup

    blup

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    Enlarge the existing hole at each end then tie cable to (smaller) drill bit and pull through. One metre long bits give a bit more leeway for this approach as you have to find the hole.

    Blup
     
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  4. Longshanks

    Longshanks

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    Thanks. When you say “enlarge the existing hole at each end”- how would you do that?

    Also, the problem is exacerbated as it’s not just cable, but coax connector that has to be pulled through. (Bought specific cable with conductor soldered to connector. This was reason for having to increase diameter of hole)

    Ta
     
  5. blup

    blup

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    It will reduce break out if you drill from each side, then drill through with bits increasing in size by a few mill at a time thus following the original hole that was made.

    Blup
     
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  7. Longshanks

    Longshanks

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    Thank you again. I’ve never known amity like it. It’s like a rail track with a hidden branch line, with the cable going down a dead end all the time.
     
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