to make a precise all in metal you use a
reamer like that this is an and reamer
and that is held in a tap wrench so
we're going to drill an all in this
piece of metal and we're going to make
the old 3.5 millimeter and then we're
going to ream it out to four millimeter
using the reamer I'm also going to drill
four millimeter hole using a four
millimeter drill bit and then you can
see the difference between the four
millimeter fiend hole that we've dreamed
out with this and the 4 millimeter
drilled hole if you ever need to make a
very precise halt a very clean hole in
metal you should always use a reamer it
gives you a lot better haul than what an
actual drill will I'm going to start off
by drilling the four millimeter all
using the four millimeter drill bit
now I'm going to drill the second doll
at three point five millimeters
I'm not going to take the Beemer in the
top edge and I'm going to carefully
bring the oil out so I'm going to apply
a downwards pressure
whilst turning it in a clockwise
direction
non-league will drill the all to about
3.8 millimeter and then leave it out but
I thought next other three point eight
millimeter drill bit so I'm doing this
very carefully what you don't want to do
is snap the reamer also this is not like
tapping where you do a couple of turns
forwards and one back you just keep
going in the same direction I've been
told that if you go backwards with a
vive your cumberland so now I thought if
that's true why not but always best to
err on the side of caution so we've now
got two holes there the top one has been
drilled two four millimeter and the
bottom one has been meand you can see
the difference in the quality if the
actual holes you can see that the bottom
hole that has been reamed is much neater
that's because a drill doesn't actually
cut on the sides of vemma doors and I've
got a piece of four millimeter round
silver steel if we get that and push it
in the oil that was actually drilled two
four millimeters you can see that it's a
very sloppy fit and it pushes through
the norm at all but it's very loose
that's because the oil is not precise if
we now pull that out and push it in they
all that's been meand you can see that
that is a nice tight fit so there's very
little movement on that whatsoever and
it is a very tight fit that is actually
gripping the silver pin steel as we push
it in there so that's all to get a very
precise all in a piece of metal by using
a reamer I'll show you again in the oil
that was drill to four millimeters and
you can see that that is very slack
indeed and it can be pushed in there no
problem the all that was rained it is a
very tight fit
you