Running cable down through a stud wall

Discussion in 'Electricians' Talk' started by RES, Feb 11, 2004.

  1. RES

    RES New Member

    I am trying to run a cable down through a stud wall, and there is a 'nogging' blocking my path. I have heard of long drills specially for this sort of job, but I can't find one. I thought of making one up, but I'm scared it might 'appear' out of the plasterboard knowing my luck. Does anyone know what I'm talking about, or more importantly know where I can get a wood boring bit about 1m long? Preferably that will fit an electric drill.
     
  2. The Trician

    The Trician New Member

    I know exactly what you are talking about - a real pain of a job! Don't know of any extra-long drills, other than those you can 'codge together' yourself. Bit of 12mm steel rod or studding and a quick tack to the drill with a welder and bags of hope that it'll last long enough to get the job done!
    Failing this, you could try drilling a 12mm hole thru' the noggin at an angle from below. This way you only end up with a 12mm hole to make good with a bit of filler!

    There are specialist drill-bits on the market but they are quite expensive to buy just for one job.
    Best of luck.
     
  3. RES

    RES New Member

    Sadly the room is decorated by Michael Angelo's wife, so interfering with her rag painted masterpiece is not an option! I've seen some flat bit extensions but they're only 200mm, and I think 5 stuck together will spin like a dogs leg. Might try your welded rod trick if all else fails. I just know I'm going to the 'Fresco'!! Hope £1m insurance will cover it.
     
  4. Dewy

    Dewy New Member

    I used to make my own extension drills but nothing like that length. Mind you, I had access to a lathe & would turn one end to fit the chuck & would drill a hole in the other the same size as the drill shank. I would then braze the drill in. Grind a flat on one side of the drill shank so the air could escape & the braze run. On such a long one as you want I would be worried if the steel wasn't perfectly straight or you may have problems. I used to drill into 5% chrome steel & never had any problems. I've seen some adaptors with a grub screw to hold the drill bit in, which also needs a flat on the drill for the screw to bite against.
     
  5. lastword

    lastword New Member

  6. RES

    RES New Member

    Lastword

    It'll bring the wall down, or at least start a fire. I am trying to drill through wood, not masonry. Don't actually own a SDS drill anyway.
     
  7. lastword

    lastword New Member

    RES

    It doesn't do either of those things. Trust me, I've done it many times - but you must use hammer or all you get is smoke!
     
  8. andyboy

    andyboy New Member

    i always chase past the noggin, i drill a hole above and a hole below the noggin, then remove the piece in between, then thread the cable over the noggin, then fill the hole.
     
  9. scubaguy

    scubaguy New Member

    Firstly, are you sure there is only one noggin? I ran a coax aerial cable down from the loft and there were 2 noggins in the area I was working - not easy at all as you have to drill through one and then through the second - but here's how I did it.

    I have made my own 1 metre extension drill. Buy a 22-25mm spade bit and a piece of steel tube that is snug around the shaft - I got mine from B & Q. Cut a short (4-5mm) slot in the end of the tube that goes over the shoulder of the bit and slide the bit in place. get a hammer and flatten the tube onto the sides of the bit - one or two hefty strikes on one side then turn over and repeat - repeat until the bit is tight. Put end of tube in drill and go at a slowish speed. The point on the spade bit will ensure that the drill does not wander. If you want to belt-and-braces the joint, you could either solder or braze.

    When I had to do the second noggin I actually used a piece of 15mm copper pipe for the extension (prety much made as above) and used a brace (brace and bit! old hand drill!) as the copper was too large for the electric chuck and the joint on the bit wasn't too brilliant.
     
  10. Sam Dingle

    Sam Dingle New Member

    buy your self a load of 16769 extension bars from SF under £2 each.
     
  11. ban-all-sheds

    ban-all-sheds New Member

    ...Don't actually own a SDS drill anyway.

    I would have thought that was an essential tool in your job?
     
  12. RES

    RES New Member

    Ban all sheds

    Don't actually work full time as an electrician. But find my Bosch percussion drill copes admirably with all I ask of it, when I do.
     
  13. Wheel-nut

    Wheel-nut Member

    RES,

    I bought a couple of Extension bars at my local ironmongers which extend my Flat Bit fast cutters. They have male and female versions of the fast cutter shank on either end and lock together with grub screws. The minimum size of drill you can use is 14mm which just clears the grub screws. I have used up to 22mm fast cutters with two extensions each 500mm long which gives a reach of about 1200mm in total.
     
  14. RES

    RES New Member

    Wheelnut

    That sounds a bit more like what I'm after. Do two extensions joined together run true? The longest extensions I can find so far are 300mm, and I think 3 or 4 joined up are going to run all over the place, and pop out of the wall if my usual luck holds good.
     

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