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Green Building Bible, Fourth Edition
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General: drill extension

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      CommentAuthordjh
    • CommentTimeAug 15th 2019
     
    I'm trying to fit a flyscreen to one of our windows and have stumbled at the first step :cry:

    It is held in place by turnbuckles that need to be close to the side of the reveal. I need to drill a 3 mm hole for each through the aluminium exterior of the window frame and at least start a hole in the timber behind. But the chuck and the body of my drill are much too wide and foul the sides of the reveal.

    So I need either a very slim drill extension, or a very long 3 mm drill. I've broken quite a few 2 mm drills in my time so I'm a bit nervous about a long 3 mm drill. The extension would need to be about 100 mm; the drill 150 mm. Does anybody have any suggestions?
    • CommentAuthorowlman
    • CommentTimeAug 15th 2019
     
    3mm drill bits rarely come any longer then 75 - 100mm, You could use an extension bit holder, the sort that normally take the various pozi bits. ( Toolstation part no 82109 ) I have one that is about 200mm long, then you'll have to find a 3mm drill bit with a hex end to fit in the mini chuck/holder, they do exist.

    A rt. angle drill may also work, or you may have to carefully go in at an angle with a 2mm drill and then try and enlarge the hole to 3mm with a small round file. Mark the wood behind with a 3mm drift.
  3.  
    I'd glue it. Messing with power tools hard up against the glazing, is asking for trouble..

    But buy a hex screwdriver extension anyways, they're always handy, get one that grips the bit mechanically not magnetically.
  4.  
    As a first attempt I would drill a 3mm hole in the centre of a 6 or 8mm rod, then grind a couple of flats on a 3mm drill and fit this into the rod and secure it either with epoxy or by (carefully) hammering the rod to grip the 3mm drill. Then carefully, with a lightweight drill that has an acceleration trigger drill the holes.

    That would be my first approach to the problem, if it didn't work after a couple of tries then its back to the drawing board and a cup of tea!
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      CommentAuthordjh
    • CommentTimeAug 15th 2019 edited
     
    Posted By: owlman3mm drill bits rarely come any longer then 75 - 100mm, You could use an extension bit holder, the sort that normally take the various pozi bits. ( Toolstation part no 82109 ) I have one that is about 200mm long, then you'll have to find a 3mm drill bit with a hex end to fit in the mini chuck/holder, they do exist.

    Thanks. It looks like either of these ideas will work. The big A has long drill bits on sale, but it looks like they come from China so I'd have to wait a while. But Toolstation has both drills and extensions in stock locally, or I may be able to get them from my local specialist tool shop so I'll ask there first. I hadn't realized such long drills were available in such small diameters, nor that I could buy regular-length drills with hex shanks, so thanks for the help.

    It's not that close to the glazing, and in fact it's the same distance as every other flyscreen, so I'm not too concerned about the risks. I can always centrepunch the ali to get the drill off to a good start if I'm very cautious.

    I don't have the kind of tools to drill a hole in the centre of a shaft unfortunately.

    But thanks for the thoughts anyway.
  6.  
    I have a range of hex drill bits which I use in my cordless screwdriver because it's a lot less bulky than my drill and as owlman said can be used in conjunction with hex extension pieces.

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