In this video we're going to cut a hole
in a cast iron soil stack. This is so we
can connect a waste pipe into
the soil stack using a mechanical boss.
I will cover that in a later video.
To cut the hole in the soil stack we're going
to use this quality hole saw which is a
Starrett and that is a 57mm one
or a two and a quarter inch. To use this
you will need an arbor that simply
screws in there like so, and then you
simply push that part forwards.
We can then fit that into the cordless drill.
I'm just going to remove the hole
saw until we get through with the actual
pilot drill. That way if we press
it on hard the teeth aren't actually going
to slam into the cast iron drain pipe.
Ideally you would use a mains powered drill
for doing this but I'm actually
going to use this cordless drill and I'm
really going to take my time with it
and do it really slowly.
You do need a very powerful drill for
a hole saw of this size.
I am going to put plenty of coolant on.
We can then proceed to cut the hole.
Technically when you're drilling cast iron
it doesn't actually need any
lubrication because it is actually self
lubricating due to the carbon in the cast iron.
But in order to get the
maximum amount of life out of the hole saw
it is a good idea to use some coolant
or some lubricant.
An important point when you're buying a
hole saw for doing this job is not to
get one with an ejector spring on like that.
If you get one with an ejector
spring like that, as soon as you get
through the cast iron soil pipe it's
actually going to spit the piece out and
that will go down the drain so it's
absolutely critical you don't get a hole
saw with an ejector spring like that.
If you have one of those you can always
remove the spring and use it that way
but never use it with the ejector spring
on because that could end up blocking
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