How to drill A 1 Inch Hole In Metal
How to Properly Drill a Hole in Metal
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hi I'm going to explain the proper way
to use a drill bit most people make two
mistakes when they're using a drill
they run the drill too fast and they
don't apply enough downward force on the
drill bit I'm going to start off with a
very small drill bit and a piece of 3/16
inch plate most of you guys are using
variable speed drills and for most holes
that you drill it should be on speed
number one speed number two is only for
the very small drill bits speed number
one is certainly for use when you're
using a stepper bit or anything bigger
than about quarter of an inch you should
always be on number one otherwise the
bit spins too fast it gets too hot when
it gets hot it ruins the drill bit then
you can't drill holes when you do
encounter a drill bit that's dull it
won't drill holes anymore don't hang on
to it don't put it back in your tool box
take it back to the tool room and
exchange it for another drill bit we
don't want you wasting time trying to
drill holes with a dull drill bit take
it to the tool room and get a new bit
okay let me let me talk to you a little
bit about cutting oil drilled the oil
that you use to lubricate the drill bits
I'm doing this from my house and this is
all I have is this little lightweight
machine oil but it will work as a
cutting oil you can use this when you're
drilling the cutting oil doesn't
lubricate the bit so much as it does as
it cools the bit you don't want the bit
to overheat because if the bit overheats
it softens the drill bit and then it
ruins it you really only need cutting
oil if the bit is starting to get hot
when you're drilling through something
like aluminum like this plate right here
this alone
plate you really don't even need any
type of cutting oil if you're drilling
through steel and you're using some
small bits like this you really don't
need cutting oil you need the cutting
oil when you start getting to the bigger
bits and again like I said if you put
oil on the bit and the oil smoking that
means everything's hot and you either
need to push harder on that bit or make
sure you're using lubricant the reason
why you want to push hard on that bit is
is as you're pushing down on it
you're removing the material that was
previously getting hot so the part of
the metal that's getting hot you're now
taking away is chips so as the drill bit
comes around to take the next pass it's
cutting a cooler piece of metal and it
keeps everything from getting so hot
that's why it's so important when you're
drilling make sure you push down hard
and the harder the material that you're
drilling the harder you need to push
down when you're drilling through
aluminum you'll notice that you don't
need to push quite as hard but you
should always get those large chips ok
let me show you how to drill a pattern
of four holes that are properly squared
to this piece of material so I have a
piece of backplane material here and I'm
going to drill drill four holes in a
three inch by 3 inch pattern one inch
away from this edge right here so to
begin with I'm going to mark off my
three inches this direction and I'm
using a sharpie just so you can see on
the material what I'm doing so I've got
that there I've got another mark there
so that's three inches another trick you
can do is you can take your tape measure
like this where you can get away from
the tip where it's hard to read it and
you can go right now I'm reading the 3
and the 6 which is three inches apart
and I can see that my marks are perfect
okay
everybody should have one of these this
is a square there we go everybody should
have one of these this is a square okay
so first thing I'm going to do is mark
my marks in this direction I'm going to
line this hole up with this hole so make
sure you're firm up against the edge of
your material right here let me extend
this just a little bit okay so again
make sure you're tight up against your
material here make sure you're tight up
against your material here and then I'm
going to mark a line just like that see
that point right through there
same thing here there we go I've gone
right through those two marks and now I
need to get the dimensions this way and
I'm going to use this tool here and as
you can see it has your marks on it so I
need a hole that is one inch away from
the edge so I'm going to take this and
move it down to one inch and I'm going
to lock it down hold it up against the
edge here actually because this Sharpie
is so fat I'm going to reduce this to
just less than one I'm going to reduce
this to just less than 1 because this
Sharpie is so fat there and there so now
these are exactly one inch from the edge
now I need to get the two holes that are
down here that are the three inches from
here which is four inches from the edge
so I'm going to set this to four inches
there's the four inch but as but
remember I'm using a Sharpie just see
you
can see so I'm going to move it just a
little bit less than four inches again
I'm going to hold it on the firmly here
holding it firmly here put a mark across
there and a mark across there now I have
four perfectly spaced marks I can Center
punch them I have the old-fashioned type
of Center punch where I have to use a
hammer but it works okay
now you're ready to drill those holes
you should always start off with the
center punch in your material which I've
done I've already made my Center punch
right here the center punch keeps the
drill bit from wandering when you're
first starting I'm going to start off by
applying a small amount of lubricant see
these nice big curls we have coming off
that's what you're looking for you want
big chips you want big curls if it's
coming off like a powdery form you're
not pushing hard enough and you're
spinning a bit too fast
I'm not even pulling the trigger all the
way I'm spinning the bit slowly
there we go that's it if I want to make
a large hole now I have much larger bit
I'm still going to spin the drill very
slowly and you should always start off
with a pilot hold which I'll use the
previous hole that I've just drilled as
my pilot hole I can use a little bit of
lubricant but if you drill properly you
really don't even need the lubricant add
the drill on the number two speed on
either drill on the number one speed so
I have the torque
look at the nice big chips once again
the big chips are coming off that's what
we're looking for is the big chips if
you drill properly and get big chips
your tip doesn't get hot the bit drill
bit doesn't get hot if your lubricant is
smoking if you're getting smoked because
you're coming off of this drill bit
you're spinning the bit too fast you
need to slow down and push harder
and again just before it breaks through
I let off the pressure a little bit see
how easy that was to drill through there
I've got nice big chips and my drill bit
isn't even hot look it's not even hot
because I was drilling slowly and
pushing hard just so that you understand
what I'm talking about I'm going to show
you the wrong way to drill a hole and
this is what I see a lot of people do
they spin the drill way too fast and
they don't apply enough pressure and
watch how hot this bit gets this is a
I'm going to ruin this bit by doing this
but this is what I typically see people
do okay see how fine see that see how
light that those chips are and do you
see the smoke coming off of it already
and I've barely started drilling the
smoke is because it's burning the oil
that's how hot this tip is getting
here that squeakin if it's squeakin
you're doing the wrong thing it should
never squeak like that
see see how fine that powder is and see
I barely drilled it you saw how quickly
this hole went through I've been maybe
barely made any progress on this one
you've got to slow that bit down and
apply a lot of pressure okay here's
another mistake I see people make let's
say for example I want to put this bolt
with nut washers and lock washers
through this piece of material right
here okay so I marked my hole a mark
where I'm going to drill it and I Center
punch it and I could actually I could
actually drill through with this larger
bit without a pilot hole this is
aluminum that I'm drilling through and I
don't really need the pilot hole however
it's hard to get that drill bit to line
up on that Center punch mark with this
big bit so I'm going to go ahead and use
my pilot hole first and drill the hole
and again just like with the steel that
I showed you earlier I'm going to push
down and spin the bit a little slower
look see those nice big curls that came
off there did you see how fast I went
through there nice big curls I've got
got a little booger that's sticking off
of that okay now I'm going to take my
larger bit and again I'm probably not
even going to push down as hard as I was
because the aluminum is so soft but
again see those curls see those nice big
curls coming off there that's what
you're looking for
there we go okay now here's where we
find out the mistake that I made and
again I see people do this frequently
they don't even bother to look at the
other side before they drill it look I
don't even have room for this washer
here's the mistake people make I put my
bolt through and they don't even have
room on the other side for the washer
they didn't I should have looked through
looked at the other side and noticed
that I had this flange on here
so I could then move this this hole over
a little bit but I've drilled this hole
and now I don't have room to put my
washer on there before you drill a hole
know what's on the other side okay I
want to show you another thing you can
do I've just drilled these two holes
through this piece of aluminum and on
the other side if you can see it you see
how these these this rough hole is here
these burrs are here
I'll show you a little trick that you
can do to clean up those rough holes you
can do this one of two ways I'm going to
show you first with the proper tool this
is a chamfer drill bit that you can use
to clean up those holes and if you need
one of these we can get one for you but
I can just lightly touch this hole and
it will put a little bit of a it'll put
a little bit of a bevel on I'll go ahead
and do this other one just touch it
lightly and it just cleans up the edge
of the hole and it puts a little bit of
a bevel on it and it makes for a nice
looking hole I don't know if you can see
that or not but it makes for a nice
looking hole if you don't have that bit
but you do want to do something like
that you can get it a larger drill bit
that's about a 3/8 hole that I drill
and I now have a half inch drill bit
pretty good sized drill bit and I can do
the same thing now I've flipped it over
these have not been done yet I can take
this larger bit just lightly clean it up
a little bit didn't take much because
that's soft aluminum it didn't take much
but it put a little bit of a it put a
little bit of a bevel on that hole as
you can see another thing that I see
people do is they will drill a hole and
they'll take the drill and they'll do
one of these numbers with the drill
running and I'm not really sure why
people do it
but it's the wrong thing to do if you're
trying to make the hole bigger use a
bigger drill bit do not do this another
trick for cleaning up the holes when
you're using a stepper bit you can go
down to the next step and just touch the
surface and it will put a little bit of
a bevel on it so I'm going to go ahead
and finish this hole okay
and I can go down just a little bit
further till the next step start
touching it that concludes my session on
the proper method for drilling I hope
you learned something out of this if you
have any questions please go to your
supervisor and ask for some help
