How to drill 2 Inch Hole Through Concrete
How to use a diamond core drill
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There may come a time when you need to put a large all through a wall perhaps for
a tumble drier or perhaps for a soil pipe and the best way to accomplish it
is by using a core drill like this. This is a diamond core drill so it's got
segmented diamonds welded on the end there it's essential when you get one of
these that you get the correct size because if you do put it a hole through
your wall and it's too small if you want to enlarge it afterwards it's really
difficult and a lot of messing about so in order to use a the core drill you're
going to need an arbor and this screws into the back of the core drill there's
generally two types of these available there's a standard one that goes in a standard
chuck or is this type which is for an SDS drill so when you screwed the arbor
into the back of the core drill you then need to insert the pilot drill which
just drops into the middle and that's a taper fitting so there is nothing for it to
grab hold of apart from the actual taper when you push that in there the friction
on the two tapers will hold that in position
so this is the drill I'm going to be using it's a very powerful drill and
whenever you're using core drills it's essential that you make sure that you
drill has a safety clutch on it because if it hasn't you could have a
really bad accident so it's essential that you drill has got a safety clutch
and also when you're doing a job like this you need a pair of gloves and a
pair of safety glasses I've placed the mark there, where I want me hole to be and I've made
sure that there's no cables or buried pipes in the wall, I actually know this
because I actually saw this wall get plastered and I know exactly where the
on the opposite side of this wall is a garage and it's a single skin wall so
what I'm going to do is I'm going to drill a hole through the wall using a
normal masonry bit I'm going to go straight through there with that and
then once I get to the other side I'm going to drill with the core drill from
the other side in so that all of the dust is in the garage
and it's not in the utility room so before a start drilling I'm just going to
tape an envelope to the wall which should catch any dust from the drill if you've
got to a wall particularly in a old house and the plaster is a little bit loose if
you have it on hammer action when you start it off you're going to end up loosing
all the plaster around the hole and your make a right mess so it's always a good
idea just to go through the plaster using no hammer action
so we're now hitting the masonry behind so we can now switch to hammer
action
so I've drilled a pilot hole now through the wall which should be visible from
the garage when we go in there and then we're going to drill back into the
property from the garage using the core drill I actually said
earlier that this wall was a single skin wall when in fact it wasn't it is a
double skin wall so I did have to use a longer drill bit in order to get through
and this is the exit hole here in the garage so now the next thing we need to
do is choose the correct arbour and if you buy your core drill set you'll usually get
two that's the correct one for a standard chuck it with the hexagonal shank and
that's the correct one for the SDS chuck which is what we're going to be using so
that's the actual core drill now and it's in the SDS drill so we're now ready
to put a 4-inch hole through this wall
the reason why I'm doing it this way so that all the dust is in the garage
rather than in the house it just makes cleaning up a hell of a lot easier then
also when you're using a core drill you have to make sure that the hammer action is
switched off so all's we do now is put the drill in the hole that we made
earlier and of course I am wearing safety gloves and glasses and at this
particular point you don't need to press on too hard we're just trying to get it
started
once you've got started drilling you hole and you have a half an inch in you can
then stop because now you need to remove the drill bit from the center because if
you keep that in it'll keep jamming and if you look though where that
hole is you can actually put a drift in there and you can knock the drift
through and it will actually loosen the drill bit and then you can just take it
straight out another important point when you're using a core drill is to
ensure that it has a safety clutch on the machine
and now we've actually just got for you the first skin which is the outer skin
so we're now going to remove that and take the core out so you can see we just
cut a four inch core through that solid wall
