Hello,
Whilst shopping in Aldi I saw some 1 metre and some 600mm sds drill bits at Aldi. I don't know if that might be useful for someone?
If so, please could you tell me what on earth you use 1 metre drill bits for?
Thanks, Stephen.
Grave robbing.
Last time I used one it was to reach _past_ a 12" steel H girder. Otherwise there wouldn't have been clearance for the body of the drill alongside it.
Thick walls with render and dry lining spaced off it?
In article , Stephen writes
Old stone buildings commonly have walls over 600mm, last time I used a
1m bit, it was about 50mm too short for the job ;-).CPC frequently have sets of 3 SDS bit in 600mm or 1m lengths on special at under a fiver and they've worked fine for my needs.
Dynamiting rockfaces.
I have a set of 3 from CPC a few years ago, about £7 IIRC. First job was to drill a hole in the corner of the ceiling diagnonally through the wall into an upstairs room which was not above the room I started from. I could do it easily standing on the floor without any steps;-)
Also used to drill at a shallow angle through thick walls, so entry/exit holes are well separated on either side, on a few occasions when that's been required.
I used one of those aldi bits to drill some slabs and underlying wall foundations so I could drop some metal gate posts in.
Sorry, not long enough! We've got an old house which has walls 5 - 6 feet thick. What are the chances of drilling through from both sidea and meeting in the middle?
Drilling down behind skirtings, where the flexibility of the long drill allows you to get the cutting end almost vertical in a chase even though the drill body can't be:
The message from Stephen contains these words:
Drilling through a 3' thick stone wall. I do it frequently.
That's how they did the Channel Tunnel!
It depends on the size of the hole you want to create, I suppose.
I drilled from both sides through our basement wall last year - with some careful measuring (and drilling) the initial 1/2" pilot holes from both sides were about 1/8" off in the middle.
Of course if a longer bit were available I would have used it, but that sort of error seems acceptable for most things that get run through solid walls (I was ultimately making a 6" diameter hole for some heating duct, so that error was no issue at all)
cheers
Jules
In message , Stephen writes
Ground source heat pumps
Drilling through thick walls. Many old buildings have walls with a rubble infill. You have to drill through with a long drill bit (or an extending set) and then attach a thin wire to the business end of the bit and pull the wire back. Otherwise the rubble just moves and blocks the hole. The walls tend to be thicker midway between apertures, incidentally.
In shop fitting the units often have voids between them so you have to drill right through two panels and a 600mm void, otherwise you are fishing across
600mm of fresh air.Bill
I solved a similar problem by locking the rubble fill with "fill-foam".
I have a similar set.
Last used for bringing an armoured cable in to a house and keeping it well below ground level on the outside.
Adam
Drilling pilot holes into rocky ground for earth spikes. Then drive the spike in with hammer-only and a suitable adapter (SDS to 0.5in square, with an appropriate socket to fit over the top of the spike).
But not using an aldi sds drill :)
Could have been - lubricated with WD40.
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