How to drill A 50mm Hole In Wood
How To Cut PERFECTLY CIRCULAR HOLES! (Hole Saw Bit/Circle Bit--Cut Circles in Wood, Drywall, PVC!)
0:00 / 0:00
Quality:
Sharing buttons:
how do trades people make these
perfectly circular holes in wood and
other materials
most new diyers think you have to drill
a hole and cut a circle with a jigsaw
but that's not the best way to do it
what you really need is a drill and a
special kind of bit
and that's what we're talking about
today on the honest carpenter show
to make these perfectly circular holes
in wood carpenters use something called
a hole saw a bit
a hole saw is a deep-throated circular
bit with serrated teeth
so when it spins against the surface it
basically cuts a perfect hole at a
certain diameter
hole saws are used for everything from
cutting lock set holes for door knobs
to knotting out drywall for can lights
pretty much every trade out there uses
hole saws for something
you've probably seen me use them on this
channel before perhaps my rotted sink
cabinet video
where i use them to bore holes for
plumbing pipes hole saws come in a range
of sizes
and they typically come in sets the
smallest bit in the kit will usually be
about three quarters of an inch and the
largest about two and a half
inches but they also come much larger
than that electricians will often use
five inch and six inch bits for boring
recessed lights
and you can buy individual bits at
different sizes if you just need a
random one
but how the hole saw operates can depend
on which brand or individual bit that
you buy
see every hole saw consists of a few
unique parts you have the saw bit
which is like a little cup then you have
the mandrel which is the brace that
mates with the drill
and you also have a pilot bit or drill
bit on some quick release sets
the drill bit in the mandrel remain
connected and you just switch out the
saw cups
i've always really liked these sets they
save headaches because they swap out so
fast
cheaper bits on the other hand will
require you to assemble the various
parts
the drill bit is separate so it chucks
into the mandrel with a little set screw
then the saw cups will also screw down
onto the mandrel sometimes with a
counter tightening nut as well
but the problem with these sets is that
the torque of running the drill
will either loosen set screws or over
tighten screw cups
i spent a lot of angry moments on job
sites fighting to change these things
out
because the threads have locked up so
much so quick release bits are like a
dream come true
all it takes is a little pull to get
them set or released but whichever type
you have
using the bits is pretty easy you just
tuck them into the drill and tighten
them
notice that the pilot bit extends just
past the saw cup
this is to help guide the bit before it
really starts cutting the pilot bores
into the wood or a drywall
thereby anchoring the bit in place now
it's centered allowing the aggressive
saw teeth to begin etching their way
into the wood
if you did this without the pilot bit
the saw would just want to skip all over
the place
it can't remain on one fixed path
because individual teeth will start to
drag it everywhere
i've found that you want to use light
pressure at first get that initial
circumference drawn
then when the saw cup is lightly
embedded you can begin to use a little
more force
i also like to keep the bits spinning at
a high speed this keeps the teeth moving
so they don't get hung up
they just rake their way through the
material steadily a few other quick
things to note
you want to make sure you're holding the
drill perfectly upright otherwise you'll
bore a lateral hole
it's easy to do that on accident also
sawdust will gunk up the teeth
you need to back the drill out
frequently and wipe the soil dust out of
the gullets
you should wait for the drill bit to
stop moving to do this and it's going to
be hot from friction so you should
probably be using gloves
unlike me when the pilot bit pokes
through the back of your material
it's best to turn the piece over and
finish drilling from the other side
this will help prevent nasty blow out
from the saw punching through the back
and the pilot hole will act as your
guide on that other face
really keeps things clean and simple
also hole saws are very aggressive
you need at least an 18 volt drill to
drive most of them or a corded drill
and they hang up easily which can really
crank your wrist
so make sure you're bracing the tool
with both hands and not forcing it too
hard
let the drill do the work i did another
video on how to rebore holes when you
already have a smaller hole
that's tricky so check that out if
you're interested also i'll talk about
other hole cutting bits in the future
such as spade bits
forstner bits and even speed boards but
hole saw bits are the only ones that
really cut large diameter holes
so they're kind of unique and that makes
them a good place to start these things
are just so helpful on the job site
you can get a perfectly circular hole in
less than a minute and you can do it on
all sorts of materials
i'm going to link several hole saw bits
and kits down below
please feel free to browse them and
remember that when you shop through
these links we receive a small
commission at no extra charge
to you it helps us keep making videos
and we greatly appreciate the support
as always thanks for watching be sure to
check back in for more videos coming up
soon
and please consider subscribing and
hitting that little bell button to turn
on notifications
that way you'll know the moment we post
something i'm ethan james with the
honestcarpenter.com
i'll see you next time
