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From YouTube: Methods for Cutting and Drilling of Metal
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A
Okay,
yeah
no
shortcut
to
is
just
a
lot
of
content
because
we're
trying
to
do
an
integrated
design
process
that
just
has
a
lot
of
elements,
but
let's
talk
about
a
couple
of
practical
things,
so
one
safety
so
that
torch
stuff.
So
let's
talk
about
cylinders,
gas
cylinders,
they're,
high
pressure,
they're
2000
psi,
which
means
that
if
it
falls
over
and
the
top
gets
knocked
off,
it
becomes
a
torpedo.
I
mean
literally
like
if
that
happened
like
in
the
middle
of
a
stadium.
The
thing
would
fly
over
the
stadium
and
stuff
like
that.
A
It
can
be
very,
very
it's
very
energetic
the
amount
of
pressure
and
force
that's
stored
up
when
you
have
this
gas,
that's
at
2000
psi.
It's
100
times
that
of
more
than
150
atmospheres,
but
it's
really
really
powerful.
So
the
thing
is
about
the
tanks
they're
on
carts,
but
they're
chained
up
together,
so
they
can't
fall
apart
or
if
they
fall,
like
the
whole
thing
has
to
fall,
makes
it
much
harder
to
knock
off
the
actual
fittings
that
are
on
it.
A
But
if
you
knock
off
the
top
like
you're,
going
to
get
a
massive,
if
you
actually
knock
off
the
fitting
that's
at
the
top,
like
the
the
knob,
you
can
have
a
very
dangerous
situation.
The
thing
will
like
just
destroy
the
whole
workshop,
just
fly
through
it.
Like
a
torpedo,
I
mean
it's
serious,
it's
serious
stuff.
So,
like
I
noticed
you
exchanged
the
tank,
you
got
to
put
it
on
a
cart
and
put
the
chain
around
it.
So
the
likelihood
of
it
just
tipping
over
and
breaking
off
a
fitting.
A
A
Well,
I
mean
it
it's
like
literally
think
of
a
torpedo
I
mean,
but
there's
ones
that
we
move
around.
You
have
to
move
them
around
because
the
torch
is
portable,
so
the
the
standard
practices.
If
you
move
in
the
tank
you
gotta
screw
on
the
top
if
it
lands
the
way.
The
top
is
designed
that
that
cover
cap,
not
the
knob
that
you
actually
turn
it
on,
but
the
cover
cap,
this
little
cylinder
thing
that
goes
on
the
shroud
over
the
top.
A
If
you
fall
over
that
that
thing
doesn't
come
off,
it's
it's
quite
safe,
but
if
we're
moving
a
single
bottle,
you
gotta
keep
that
on.
Don't
don't
move
a
cylinder,
a
full
cylinder.
That's
got
the
top.
The
knob
actually
exposed,
because
that's
it's
like
a
three-quarter
inch
fitting
or
whatever
it's
pretty
thin
up
there.
You
can
knock
it
off
and
cause
a
very
dangerous
situation
on
the
cards.
A
C
A
Yeah,
we
should
have
like,
I
think,
there's
another
full.
The
ones
that
are
full
are
in
the
west
back
not
by
the
entrance
but
more
like
in
the
corner,
but
yeah.
That's
just
the
safety
thing
standard
is
the
chain
around
it
bonding
the
two
bottles
together,
so
it's
much
harder
for
them
to
fall
off
and
in
the
cart
there
it's
a
little
more
stable,
but
also
on
the
welders.
There's
a
chain
around
the
welder
bottle
gas
bottle,
make
sure
that's
on
and
not
like.
A
Don't
hang
the
chain
where
it's
like
got
a
bunch
of
slop,
because
it
could
still
possibly
fall
over
it'll,
get
it
tight
so
that
the
chain
is
hugging
right
against
the
bottle.
So
if
you
like
tip
it's
just
much
harder
for
it
to
fall
over
yeah,
that's
one
thing:
let's
talk
about
the
very
important
topic
just
to
practice
in
in
the
workshop,
if
you
put
in
the
just
notes
in
the
critical
path
doc,
how
do
you
cut
steel
and
what
tools?
A
What
tools
are
usable
for
cutting
steel
because
there's
like
so
many
different
ways
to
cut
things,
whether
it's
wood,
steel
or
other
materials?
But
let's?
Let's
do
a
survey
of
that
real,
quick,
just
just
to
appreciate
some
of
the
subtleties
there,
because
there's
just
so
many
ways
to
do
it.
So
this
is
like.
I
started
thinking,
okay!
A
Well,
it's
so
I
started
okay,
how
do
you
drill
a
hole
or
cut
a
thing
and
then
turned
out
into
this
40
item
list?
So
because
there's
really
a
lot
of
a
lot
of
ways,
you
can
do
it
so.
A
Okay
tool
use
cutting
steel
and
holes,
so
first
you
have
to
consider
what
kind
of
material
you're
cutting
in
terms
of
profile,
whether
it's
solid
or
hollow
so
so
solid
hollow
thick
thin
irregular,
because
you're
gonna
do
different
tooling,
for
whatever
geometry
you
have,
and
you
have
to
understand
that
as
a
from
the
get
goes,
the
tools
available
are
iron
worker
hole,
puncture.
A
So,
first
with
the
iron
worker,
where
to
use
the
iron
iron
worker-
and
here
you
can
do
like
a
whole
like
a
two-dimensional
chart
showing
like
material
thickness
or
like
shape
versus
like
what's
the
ideal
tool
to
use,
and
you
get
clusters
and
you'll
see
like,
but
you
have
to
un.
Have
this
whole
picture
of
okay.
If
I
want
to
do
something
like
a
cut
of
some
sort,
which
is
the
first
thing
I
turn
to
and
what's
the
capacity
including
safety,
speed,
cleanness,
precision
and
all
that?
Okay?
A
A
It's
pretty
precise,
it's
pretty
right
on,
because
the
blade
gap
is
only
like
a
like
seven
thousandths
or
so
it's
so
you
get
a
pretty
clean
cut.
So
say
you
want
to
cut
what
kind
of
plates
for
the
torch
table
their
quarter
inch
will
be
our
first
choice.
We
use
the
iron
worker,
so
we
got.
We
got
12
12
inch
wide
stock.
A
A
We'll
be
your
next
tool
like
say
the
ironworker
was
out.
We,
the
power
cube
right
out
of
gas.
Where
do
you
go
add
another
power
cube?
You
could
do
another
power
cube,
in
which
case
would
you
do
it
versus
okay?
I
gotta
drive
life
track
back
in
at
what
point
would
you
say,
I'm
gonna
get
the
other
power
cube
versus
now,
I'm
just
gonna.
Do
this
other
thing?
What's
your
next
best
choice.
A
No
not
not
angle,
grinder
angle
grinder
at
most
you'd
ever
use
like
eighth,
but
not
for
long
linear
cuts.
You
can
do
the
cutting
blade
on
a
on
an
angle.
Grinder,
that's
the
thin
one,
but
it's
slow
and
you
can't
the
danger
is,
if
you
torque
it
like,
you,
can
get
the
blade
stuck.
If
you
don't
go
vertically
down
you
torque
that
it'll
just
rip
and
possibly
injury,
the
blade
will
shatter
it's
for
safety
wise.
A
A
If
you're
going
to
do
a
cut
of
something
just
take
it
right
on
an
abrasive
cut
off
the
14
inch
abrasive,
cutoff
wheel,
that's
safe,
because
you
can
clamp
the
object
for
the
abrasive
cutoff.
You
have
to
hold
that
thing
that
that
thing
can
move.
If
you
catch
the
blade,
that's
the
real
danger
of
it.
Try
not
to
use
the
cut
off.
I
I
never
use
it
because
of
that
I
mean,
unless
you're
paying
attention
the
whole
time.
A
It's
a
dangerous
tool,
so
hole
puncher,
thick
metal
up
to
one
inch.
We
we
sheared
the
one
inch
for
what
oh
yeah
for
the
counterweights
for
the
it
could
hardly
cut
one
by
twelve.
I
had
to
just
keep
going
back
and
forth
to
cut
it,
but
yes
for
quarter
inch.
Yes,
definitely
that
grinder
for
quarter
inch.
A
Angles
too,
ironworker
does
angles
quick
way
to
do
angles:
okay,
hacksaw.
What's
the
limit
of
a
hacksaw.
A
Yeah
well,
okay,
let's,
let's
kill
off
so
I
think
we
didn't
never
got
to.
Will
we
take
out
live
track
or
use
the
torch
at
which
point
the
torch.
I
mean
that
could
be
pretty
quick,
say
you
had
to
cut
that
cut
that
out
of
like
say,
12
inch
stock.
You
have
to
cut
12
inches
across
it's
pretty
fast,
but
what's
the
disadvantage
of
that?
You
got
all
this
cleanup
at
the
end.
It's
it's
as
straight
as
you
can
run
with
your
hand
against
the
guide,
but
you
can
definitely
do
that.
A
You
can
definitely
do
it.
It's
fast
grinder,
no
circular
blades
there
are
metal
cutting
circular
blades.
There's
a
thing
called
a
cold
saw
which
is
like
the
abrasive
cut-off
saw,
but
it's
a
slow-moving
metal
blade
and
it's
water
cooled
like
liquid
cooled.
We
actually
have
one,
but
we
hardly
ever
use
it.
It's
not
really
set
up.
A
A
A
Before
it
gets
unpractical
practical
range
of
that
is
like
quarter
inch
once
you
start
getting
into
like
half
inch
like
half
inch
plate
yeah,
you
can
do
it.
It's
much
slower
quarter,
inch
yeah,
you
could
still
do
it.
You
can
still
cut
your
quarter.
Inch
tubing,
half
inch
tubing
man
that
would
take
forever.
So
you
that's.
Why
you're
doing
that
all
with
a
torch
can't
do
it
on
an
ironworker
hacksaw.
You
can
do
it
it'll.
A
A
A
This
is
an
advanced
hacksaw
like
one
of
these
things,
if
you
use
a
metal
blade,
can
you
do
like
a
one
inch,
shaft
yeah,
you
can,
with
a
metal
blade.
It'll.
Take
you
like
a
minute
if
you
have
to,
but
it's
it's
kind
of
hard
work
you
have
to
hold
it.
So
abrasive
cut
off
would
be
easiest.
You
can
definitely
torch
it.
A
A
So
how
would
you
cut
okay,
let's
cut
thin
metal
sixteenth
inch
best
way
to
do
it.
A
Angle,
grinder
cutting
blade,
yes
dangerous.
You
got
to
watch
it
easy
to
bind
up
once
again,
not
recommend
it.
I
would
actually
do
a
a
diamond.
A
metal
cutting
blade
on
a
circular
saw
that
actually
works
really
well,
so
circular
saw
with
metal
blade
and
you
can,
like.
Google
youtube
like
if
you
there's
probably
gonna,
be
creative
ways
to
do
many
different
things.
If
you
don't
have
the
right
tool,
but
there's
better
and
worse
things
to
do,
but
actually
the
circular
saw
with
metal
blade.
A
A
Yeah,
it's
not
got
teeth,
teeth
would
catch
and
rip
it
very
hard,
so
you'd
have
to
have
small
teeth
on
another
type
of
blade,
so
this
would
be
great
say
we're
making
a
bottom
of
the
blade
for
the
the
3d
universe,
bottom
of
the
blade
bottom
of
the
plate.
The
heated
plate,
the
thin
plate
on
the
bottom,
which
is
actually
16th
inch
this.
A
What
else
can
you
do?
You
can
do
the
ironworker
yeah?
It
could
probably
work,
but
it
might
bend
the
edge
a
little
bit
because
if
it's
so
thin
it
might
end
up
bending
your
piece.
This
doesn't
bend
anything
it's
kind
of.
It
leaves
sharp
marks
on
the
metal,
but
doesn't
heat
it
up
too
much.
It
works.
Well.
So,
what's
the
limit
of
a
thing
like
this.
A
So
for
eighth
think
about
this
is
heat
with
a
thin
metal.
You
don't
build
up
enough
heat
in
this
blade
here
before
you
cut
it
heat
buildup.
So
once
you
go
above
an
eighth
inch,
the
metal
will
get
so
hot
that
this
blade
will
get
so
hot
and
you'll
crush.
It
won't
cut
anymore.
A
These
the
larger
they
are,
you
can
cut
more
ambitious
stuff
up
to
like
a
quarter
if
you
have
a
big
one.
So,
let's
look
at
so
that's
like
a
held
handheld,
relatively
small
one.
They
have
ones
like
this
they're
huge.
We
have
one
of
those.
It's
called.
Let's
see
what
comes
up
for
a
quickie
saw,
they
call
it.
A
These
ones,
so
this
will
cut
quarter
inch,
steel
tubing.
That
may
not
be
the
right
blade.
The
I
would
do
something
like
this
is
gas
powered
heavy
equipment
kind
of
stuff
cut
con
like
these
are
like
all-purpose,
like
concrete
metal
like
demolition
blades,
but
there's
a
difference
between
the
concrete
cutting
blade.
A
A
Like,
for
example,
someone
came
out
here
with
this
saw
like
I
would
be
torching
like
early
life
track
tractors,
we
use
four
inch
tubing
quarter
inch
wall.
I
was
used
to
typically
doing
that
with
a
torch.
They
had
one
of
these
and
showed
me
like
wow.
I
couldn't
believe
this
thing
cuts
like
that
you
can
cut
up
like
through
cars
and
metal
and
whatever
you
got
these
things
do
that.
A
So
let's
look
at
the
difference,
so
in
a
blade
repo
that
we
have
there's
slitted
blades
like
that
and
you
have
to
be
able
to
determine
which
is
one
for
metal
versus
concrete,
because
the
ones
that
work
on
concrete,
like
the
metal
ones,
would
tend
to
dull
on
concrete,
quite
a
bit
they're,
not
really
interchangeable,
so
metal
versus
concrete
diamond
blade.
What's
the
difference.
A
A
A
A
Yeah
and
you'll
have
combo
combination,
style
things
like
one
that
might
have
both
slits
and
bumps.
Okay.
What
about
this
one?
What
does
this
style
do
and
we
have
one
of
these?
If
you
look
look
at
it,
this
one
is
for
a
very
aggressive
grinding
of
concrete,
like
say:
do
a
foundation,
you
got
like
big
bumps.
This
cuts
right
through
them.
A
A
Yeah,
so
you
do
it
like
flat
like
like
a
grinder,
you
would
grind
flat
like
they'll,
be
way
more
aggressive
than
you
need
to
get
out
bumps
like
this
they'll
be
more
like
for
this
you'd
need
more
like
a
buffer,
which
is
so
what's
a
buffer
blade,
look
like
as
we
do
use
buffer,
blades
diamond
polishing
blades.
There's
a
difference
between
this
is
not
a
polishing
blade.
This
is
an
aggressive
grinding
blade,
so
diamond
polishing
blade
looks
different.
A
A
These
are
no.
We
lost
it
like
the
places
where
it's
really
flat
right
now,
the
smooth
shiny
parts-
if
you
take
these,
it
will
make
it
shine
completely
yeah,
but
the
parts
where
it's
like
we
got
those
joints
where
it's
like
a
little
uneven
by
like
visible
amount.
No
they're
you'll
wear
these
out
too
fast.
So.
A
A
A
Yeah,
okay,
back
to
some
more
cuts
like
critical
thing
about
the
abrasive
cut
off
is
that
you
got
to
hold
the
work
piece
down.
You
can
do
things
like
you
notice,
like.
How
would
I
cut
the?
How
did
I
cut
the
bolts
slid
down
on
how
did.
A
Yeah,
how
do
I
do
that
you
got
to
hold
it.
You
can't
do
any
cutting
without
holding
things
down
like.
If
you
were
to
try
to
hold
it,
I
mean
you
got
to
hold
it
somehow.
Freehand,
don't
do
that
with
a
slitting
blade
once
again,
very
the
deeper.
The
cut
is
the
easier
it
is
for
your
blade
to
bind,
and
you
have
to
a
lot
of
times
you
with
a
grinder.
A
You
have
to
pay
attention
like
if
you're
grinding
and
say,
like
you,
you're
inside
the
tube
or
something
or
inside
the
larger
tube,
with
a
large
blade,
be
careful
about
binding
or
like
where
one
side
kind
of
catches
and
the
other
side
catches
dangerous
stuff,
because
the
the
grinders
there
we
have
our
five
nine
or
15
amps.
The
15
amp
has
got
a
lot
of
force.
The
5
amp
one.
If
you
completely
bind
up
it'll
shake
you
around,
the
15
amp
is
gonna,
be,
can
throw
you
around
so
dangerous.
It's
a
fast
spinning
blade.
A
The
the
abrasive
works
by
spinning
really
fast.
That's
how
all
the
sparks
fly.
So
those
things
are
like
10,
000
rpm
for
the
small
ones.
For
the
large
grinders,
maybe
they're
like
5000
rpm,
typically
faster
than
a
regular
cutoff,
so
which
is
like
3600
rpm.
How
do
you
get
3600?
A
It's
60
hertz
by
the
type
of
motor,
the
typical
number.
There
is
60
hertz,
which
means
60
per
second,
which
means
3
600
per
minute.
So
typical,
if
you
think
about
the
numbers
there
3600
is
pretty
fast.
That's
what
you
cut
wood
with
slower
than
that,
and
you
have
things
like
the
the
cold
cut
metal
saw,
which
looks
like
a
regular
blade.
It's
got
real
teeth,
but
it
moves
very
slowly.
So
each
tooth
only
takes
out
so
much
and
the
teeth
are
pretty
small
cold
cut.
A
They're,
like
this
they're,
pretty
small
teeth,
the
blade
itself
is
relatively
thick
and
you
have
to
put
a
lot
of
force
on
it,
slow
moving
like
maybe
like
100
rpm
or
something
it's
just
slow.
It
goes
like
that
that
fast
you
can
see
it
move.
Okay,
what
else
to
cover
about
tools
hollow
okay,
bandsaw?
What
can
you
do
on
a
band
saw?
A
What's
the
limit
of
a
band
saw
it's
good
for
solid
solids,
but
for
narrow
wall
stuff?
The
principle
is
you
got
to
have
a
few
teeth
on
the
metal
at
all
times,
otherwise
the
teeth
will
just
rip
right
out.
So
if
you
do
a
thin
tube
like
like,
say
a
quarter
inch
tube,
you
want
to
have
several
teeth,
so
the
teeth
have
to
be
very
fine
like
a
hacksaw.
For
that
blade
to
work
effectively
the
big
bandsaw
we
have
some
have
teeth
that
are.
You
know
like
a
quarter
inch
apart.
A
That
will
rip
the
teeth
right
out,
because
you
want
to
have
multiple
teeth,
riding
on
the
metal
that
you're
cutting
at
all
times.
That's
why
solids
are
okay,
because
you
then
you're
gonna
ride
a
lot
of
teeth
on
them
on
a
solid,
whereas
a
hollow
thin,
walled
thing
like
say:
electromechanical,
tubing,
like
conduit
tubing,
will
rip
the
teeth
right
out
of
a
bandsaw,
so
no
thin
stuff
on
a
bandsaw
annular
cutter
versus
drill
press.
So
we
talked
about.
We
got
annular
cutters.
A
So
that's
the
difference.
What's
a
regular
drill
bit
versus
annular
cutter,
so
that's
the
mag
drills
annual
cutters.
Those
are
those
annular
cutter
bits
they
have
a
hollow
inside.
They
also
have
a
pin,
that's
a
centering
pin.
So
when
you
start
one
of
these
holes,
you
have
to
start
against
metal,
you
cannot
drill
a
hole.
A
That's
been
already
drilled,
partly
like
if
you're
trying
to
take
drill
upon
a
quarter
inch
hole
with
this
say
one
inch
blade
one
inch,
annular
cutter,
there's
a
pin,
that's
inside
there
that
has
to
touch
the
metal,
so
it
doesn't
shift
around
when
it
starts.
So
you
cannot
use
this
to
enlarge
an
existing
hole,
new
holes.
A
Only
you
have
to
do
that
against
metal
compared
to
would
you
drill
with
this
for
a
one
inch
hole
like
say
you
had
the
mag
drill,
one
inch
hole
what's
advantage,
disadvantage
use
this
versus
a
solid,
regular
drill
bit.
A
A
A
B
A
Miscommunication
you'd
have
to
start
a
new
hall
yeah.
C
A
Because
I
didn't
know
you
started,
I
thought
you
were
starting
with
that
bit
as
opposed
to
enlarging
an
existing
hole
yeah,
because
if
you
were
starting
that
hole
yes,
yes,
yes
and
I
missed
that
you
already
had
holes
in
there.
A
B
B
A
Maybe
if
it
was
the
whole,
the
metal
was
thin
enough
of
that
pin
in
the
middle.
The
pin
only
sticks
out
so
much
so
it
would
have
to
reach
it
yeah
when
you
remount
a
hole
from
smaller
size
to
larger
size.
A
What
can
you
do
comfortably
by
hand
in
terms
of
a
drill,
because
not
annual
cutters,
annular
cutters
have
high
torque?
That's
why
those
motors
are
slow
and
gear
down
for
safety.
The
other
thing
I
forgot
to
mention
no
gloves
when
doing
that,
because
they'll
bind
up
and
rip
your
fingers
off
pretty
easily
because
it's
a
high
torque
machine,
the
annular
cutter
is
more.
A
But
I
mean
you
still
don't
want
to
be
wearing
heavy
gloves,
perhaps
if
you're
doing
high,
like
big
bits,
okay,
but
the
question
is
what's
really
easy
and
safe
to
do
by
hand
versus
it's
like.
Oh
man,
it's
just
too
hard,
and
what
yeah
and
also
the
second
question
is
gonna.
Be
why?
But
what's
the
limit
by
hand.
A
Yeah
I'd
say
that
my
experience
on
that
quarter
inch
with
a
new
bit.
You
can
drill
right
through
that
with
a
cordless
drill,
the
cordless
bigger
than
one
quarter.
Don't
don't
try
it
too
hard.
So
what
happens?
If
you
do,
try
it
and
you
don't
have
enough.
First
of
all,
it
takes
a
lot
of
strength.
You
have
to
press
down
hards,
but
you
can
do
it
with
a
quarter
inch
by
putting
it
on
a
table
and
leaning
into
it
with
your
body.
That's
quite
easy!
A
A
A
A
So
you
don't
have
enough
force
down
if
you're
not
cutting
that
hole,
and
you
don't
see
the
nice
slivers
of
metal
coming
out
because
they
release
heat
too
that's
they're
hot
and
they
fly
off.
If
you
keep
drilling
in
there,
it's
like
starting
a
fire
with
your
rubbing.
Sticks.
That's
what's
happening
there.
A
A
I've
seen
it
happen
on
abrasive.
Cutoff,
where,
if
you
get
too
thick
metal
like
half
inch
or
even
quarter
against
the
flat
surface,
so
the
technique
for
even
quarter
even
1
8
on
abrasive,
cut
off
always
use
a
corner
to
start
on,
don't
use
the
flat
side,
because
then
the
blade
has
got
all
that
surface
to
go
against.
So
it
doesn't
even
see
that
it's
1
6
1
8
thick
it
for
all
it
matters.
It's
seeing
that
it's
got
a
solid
surface.
A
A
Maybe
maybe
do
it
like
that
so
you're
cutting
the
edge
just
be
careful
like
when
you're
cutting
down
don't
end
up
where
the
blade
ends
up
perfectly
flat
on
a
flat
surface,
because
the
cut
area
is
really
large
and
it
doesn't
have
enough
strength
to
do
it.
What
will
happen
then?
Is
you'll.
Just
heat
harden
it
and
you'll
find
that
you
can't
even
cut
through
with
a
blade
anymore.
It
will
actually
wear
out
the
blade
before
it
starts
cutting.
A
A
Yeah,
so
you
definitely
have
to
consider
whatever
you're
doing
you
have
to
think
about
it.
Okay,
if
you
see
that
the
abrasive
cutoff
is
not
cutting
and
it
should
be
like
stop
a
little
bit.
Maybe
okay
is
the
motor
weak.
Am
I
actually
hardening
the
steel
because
I'm
cutting
against
the
flat
surface,
because
good
cutting
should
be
good,
sparks
and
abrasive
tools
and
on
bits
you
should
have
clear
shavings,
not
those
ones
that
turn
like
purple
and
hot
looking
or
even
potentially
like
glowing.
A
That's
not
good!
You
got
a
part
of
the
heat
dissipation
is
that
you
got
the
the
shards
coming
off.
Releasing
some
of
the
heat
and
water
lubrication
like
diesel
is
great
for
or
even
water
just
for
the
annular
cutters
make
sure
that
when
you're
going
down
you're
not
going
too
fast,
but
fast
enough,
that
you
get
good
cuttings.
So
that
applies
to
both
drill
and
you
have
to
get
a
feeling
for
this.
Where
an
abrasive
cutoff,
you
can't
press
down
too
hard
you'll
burn
out
the
motor.
A
You
can't
press
too
light
you'll
go
too
slow
and
you'll.
Instead
of
cutting
you'll
be
warming,
it
up
and
you'll
harden
it.
So
like
good,
you
have
to
kind
of
think
about
what
get
an
understanding.
What
a
good
cutting
rate
is
that
you'd
kind
of
maybe
like
watch
some
youtube
videos
or
just
get
experience
like
what
do
you
see
is
like
okay,
that
was
a
clean,
good,
fast
cut,
knowing
that,
like
quarter
inch,
yes,
should
be
cutting
readily
with
the
abrasive
cut
off
yeah
and
with
drill
bits
clean
shavings.
A
A
How
did
I
cut
that?
So
if
you
notice
that
was
a
threaded
bolt
so
when
you
try
to
cut
a
threaded
thing,
note
that
you
can
put
nuts
on
it,
so
what
I
did
is
took
a
piece
of
metal
that
had
a
hole
in
it
and
I
put
a
nut
on
the
top
and
bottom.
So
I
could
hold
that
it
was
a
tube
I
held
the
tube,
I
actually
clamped
the
tube
and
then
the
bolt
was
sticking
up.
A
It
was
through
one
of
the
hole
tubes
or
a
plate
plate
that
was,
I
could
put
the
bolt
in
vertically
put
a
nut
on
it,
and
now
it
was
firmly
held
so
that
I
could
cut
down
straight
with
the
abrasive
cutoff
I
just
put
in
the
vise
of
the
abrasive.
Cutoff
saw
the
metal
I
held
in
the
vise
of
it,
so
yeah,
that's
the
key
to
holding
it.
Couldn't
do
that
by
hand.
A
You
can't
hold
it
by
hand
because
there's
a
lot
of
force
on
the
cut
you
do
have
to
cut,
because
it's
so
yeah
strong
pair
of
pliers.
That
was
a
three-quarter
inch
bolt.
So
that's
like
a
lot.
That's
a
lot
slow
cut,
so
so
at
that
point
I
had
to
watch
out
for
okay.
Let
me
I
need
to
press
down
hard
enough,
so
I'm
not
heating
it,
but
instead
really
cutting.
I
had
to
pay
attention
to
that
and
otherwise
have
the
hold
very
firm
in
the
vice
of
the
machine.
A
A
I
cut
the
three-inch
shaft
with
that.
That
was
like
the
only
tool
you
could
do
with
that.
You
can
put
it
well,
no
bandsaw
bandsaw
bandsaw
would
be
the
cleanest,
but
it
would
take
more
time
than
torching.
Torching
was
okay,
but
a
really
messy
cut.
You
gotta
grind
it
down
at
the
end,
quite
a
bit
all
kinds
of
slag
and
you
kind
of
got
to
rotate
it
as
well
a
lot
of
slag
with
the
acetylene
torch.
A
If
you
go
to
hydrogen,
which
is
that's
something
we
gotta
start
using
here,
but
hydrogen
torch
torches
don't
have
the
slag
problem
nearly
as
much
very
clean
cuts,
and
they
could
also
do
aluminum
and
other
metals
like
stainless
steel
or
copper.
I
think
they
cut
through
copper
too.
A
A
setting
torch
doesn't
cut
well
through,
like
you
can't
cut
aluminum
with
it
or
or
copper,
because
you
know
it
ends
up
melting
and
it
just
does
like
this
pretty
much
a
molten
channel
instead
of
a
cut
yeah,
because
I
think
the
aluminum
for
some
I
don't
know
it
sounds.
I
don't
know
why.
Why
can't?
Why
not
yeah
it
doesn't
have
a
burn
as
fast.
Why
not.
A
Because
aluminum
oxyacetylene
will
get
aluminum
hot
enough
to
melt
away,
but
no
way
for
a
neat
matter.
It
just
melts.
It
tends
to
melt
it
more
than
cut
it.
It
just
doesn't
work
for
some
reason,
while
the
oxy
hydrogen
works
better.
What
else
I'm
cutting.
A
A
B
What
about
like?
Is
there
an
approach
to
this?
Where,
like
I
guess,
like
a
more
physics,
oriented
or
like,
is
there
some
field?
That's
like
the
intersection
of
like
there's
like
material
science
right,
you
talk
about
like
cutting
metal
and
wood
and
then
I'll
be
interested
in
like
knowing
how
I
can
or
like
a
more
generic
approach
to
cutting
any
any
material.
A
Clamp
it
down,
don't
get
your
fingers
in
the
way
you
have
to
consider
it's
about
the
strength,
melting
temperature
oxidizability,
primarily
like
the
materials
properties
you're
talking
about
for
metallics.
It's
like
metallic
versus
stoner
wood
wood
has
fibers.
A
A
You
can
only
do
so
much
by
in
terms
of
your
how
straight
you
can
hold
things
you
can
use
templates
if
you
can
lay
something
against
the
template
you
can
get
down
to,
like
probably
like,
maybe
up
to
16
inch
accuracy,
because
the
the
accuracy
is
that
of
template,
plus
how
straight
you're,
holding
the
thing
like.
If
you
hold
it
straight
down
for
a
torch
versus
you
got
it
at
a
small
angle.
A
There's
there's
circle
cutting
jigs
for
torches.
So
if
you
want
to
cut
like
a
big
hole,
there's
a
thing:
it's
like
a
protractor
thing
where
you
lay
the
torch
on
a
pivot
and
you
and
you
kind
of
just
move
it
in
a
circle
so
for
a
large
hole,
because
the
question
comes
up
a
lot
of
times.
Okay,
holes,
yeah
holes
are
common
features
and
different
things
for
that,
ideally,
you
got
cnc
torch
for
making
the
plates
right.
A
There's
on
a
lathe
meaning
a
thing
that
spins
something
like:
if
you
have
your
drill
or
a
cordless
drill,
you
can
hold
the
rod
and
if
you
hold
some
kind
of
a
grinder
or
cutting
tool
against
it,
you
can
cut
things
that
way
too.
They
have
like
cut
off
cut-off
blades,
like
kind
of
lathe,
a
thin
knife
like
structure
that
you
poke
it
into
the
material
and
it
cuts
it.
It
shaves
it
off.
A
For
grinders,
we
are
the
difference
between
another
wheel.
There's
buffing
wheels
and
there's
grinding
wheels.
Buffing
wheels
are
the
ones
that
kind
of
like
the
flaps
or
the
pads
on
them,
which
are
used
for
polishing
things,
not
so
much
grinding,
buffing
wheel,
grinder.
A
A
It's
pretty
much
got
sandpaper-like
material,
don't
use
that
to
grind
stuff
you'll,
just
wear
that
right
out,
but
this
is
good
like
say
you
want
to
get
rust
off
or
to
polish
shine
something
up
a
little.
So
we
have
some
of
these.
Don't
confuse
with
regular
grinder
wheels.
A
Grinder
wheels
use
the
fat
ones,
try
not
to
use
the
cut-off
grinder
wheels.
As
I
mentioned
for
safety
reasons,
I
mean
it's
the
safest.
If
you've
got
like
really
thin
material
yeah,
you
can
cut
off
with
a
cutting
wheel.
I
don't
like
it
in
general,
because
I
just
put
on
a
on
a
cut
off,
saw
the
abrasive
cut
off
so
on
the
lathe.
How
do
you
so
the
cnc
lathe
concept?
That's
how
you
get
a
okay.
So
how
do
you
get
super
precise,
so
there's
milling
and
there's
grinding?
A
So
where
do
you
do
or
what
are
the
limits
of
high
force
machining,
which
is
drilling
milling,
lathing
versus
grinding?
How
do
you
actually
get
the
most
precise
features
and
the
answer
is
grinding?
Actually,
so
drill
bit
would
not
be
made
by
machining
it
you?
Might
you
might
start
but
for
the
precision
you
want
a
grinder?
Why
so
why
a
grinder?
So
if
you
want
a
grinder.
A
High
speed,
high
rpm
means
you
need
less
force
to
do
an
action
with
the
machine,
cutting
tools,
they're
hard
contact,
one
thing
against
another
think
about
how
much
force
it
takes
you
to
drill
a
hole
in
metal,
a
lot
of
force
contact
machining.
So
if
you
want
the
super
super
precision,
you're
going
to
end
up
with
grinding
so
say
you
want
to
do
a
drill
bit.
You
might
preform
it
to
like
a
shape,
maybe
like
with
the
flutes
in
there,
even
by
like
twisting
a
piece
of
metal.
But
how
do
you
get
that
sharp
edge?
A
That
would
be
grinding
there?
And
why
is
that?
Because
the
drill
bit
at
the
end
of
the
day
wants
to
be
made
of
hardened
material
or
hardenable
materials.
So,
first
of
all
the
machining
would
not
work
well
because
you're
working
on
hard
material
and
then
for
precise
features,
they're
very
sharp.
You
want
the
least
force
possible
because
once
you
go
against
something,
especially
if
it's
like
a
long
tube,
that's
your
drill
bit!
A
You
know
you
have
to
support
it
very
hard
in
order
to
machine
it
heavily.
But
how
do
you
do
like
a
very
tiny
drill
bit?
Well,
you
can't
you'd
break
it.
So
the
only
way
you
could
do
that
kind
of
stuff
is
grinders,
so
the
limit
of
grinders
is
air
bearings,
so
smooth
that
just
the
friction
between
two
surfaces
serves
enough
to
trap
air
in
there
for
a
completely
smooth
glide.
A
A
Part,
let's
see
the
he,
this
guy
actually
built
build
this
thing,
but
yeah.
So
actually
this
is
dan
gilbert.
He
does
this
crazy,
high-tech
machining
stuff.
A
A
So
that's
the
territory
of
cnc
grinding
which
gets
you
such
precision
that
when
you
make,
I
think
he
shows
it
at
the
end.
The
grinder
part
is
that
tube
there
that
thing
yeah
watch
this
video
later,
but
he
shows
the
product
of
it.
B
A
They
wear
down
and
that's
the
other
challenge
of
those
you
gotta,
even
them
out
or
use
new
ones
after
some
time
because
they
will
wear
down.
So
you
can,
but
here
in
this
video,
take
a
look
at
that.
It's
quite
instructive,
two
cylinders,
so
you
make
one
cylinder
and
a
pin
that
goes
inside
of
it
and
because
of
the
precision,
no
oil,
no
nothing!
A
That's
called
air
bearings
and
that's.
What's
used
in
super
high
fast
rotating
things
like
jet
engines,
you
can't
have
ball
bearings
and
things
like
jet
engines,
it's
it's
just
air
gliding
against
air
and
that's
how
you
do
oil-less
engines.
That's
like
the
next
level
of
beyond
internal
combustion
engines
of
today
ain't
happening
nobody's
industry's,
not
gonna,
do
that.
That's
disrupts
an
entire
civilization.
C
A
Exactly
so,
the
hydrogen
economy
comes
the
cost
of
access
to
this
technology,
but
it's
doable,
it's
called
grinders
and
lathes,
and
how
do
you
get
the
super
precision
surfaces
to
move
on
right?
We've
done
our
torch
table,
not
that
precision.
How
do
you
get
down
to
like
one
micron
flatness
and
that's
actually
very
common
already
in
tile
that
industry
so
the
most
advanced
this
example
here?
A
A
Well,
so
people
make
marble
walls
and
granite
like
marble
that
technology
that
I
used
to
polish
is
super
super
smooth,
it's
lapping,
but
that
technology
has
been
around
for
a
long
time
because
you
have
smooth
marble
for
a
long
time,
but
those
things
are
like
super
precise.
So
the
way
to
make
one
of
these
air
bearing
lathes
is
you
get
granite
for
cnc
you
get
these
blocks
of
granite.
A
A
48
inch
by
36
by
6
inch,
so
it's
still
tiny,
but
it's
quite
long.
Oh!
No!
No!
That's!
That's
big!
That
wow!
That's
a
big
chunk
40
by
36
by
6
inch
thick!
Oh
yeah!
That's
gonna
be
like
a
ton
of
weight
or
something,
but
it's
not
that
expensive
to
get
like
capacity
to
make
jet
engines
for
a
thousand
dollars.
It's
not
too
bad.
A
A
It's
lapping,
it's
like
no,
it's
different
technology,
but
it
is
where
it's
like.
It's
called
lapping.
If
you
take
two
surfaces,
keep
rubbing
them
against
each
other.
They
actually
end
up
wearing
out
to
perfect
smoothness.
So
there's
the
whole
technology,
but
that's
well
established
and
you
can
get
these.
I
mean
that
block
of
granite.
It's
not
like
10,
000
bucks,
but
huge.
I
mean
that's
like
a
four
by
it's
like,
like
a
four
by
four
by
six
inch.
Freight
is
going
to
be
quite
a
bit
on
that.
A
Probably
it's
like
shipping.
A
I'm
not
we're
not
going
to
buy
that
right
now.
No,
it
wouldn't
be.
It
would
be
free
delivery,
but
it's
actually
not
bad,
like
you
know,
six
by
eight
inch
by
two
inch
for
that
super
level
of
precision
down
to
like,
like
a
micron,
which
is
one
tenth
of
like
one
or
a
micron,
is
25.
Microns
are
one
thousandth
of
an
inch
so
down
to
one
micron
is
like
one
twenty-fifth
of
one
thousandth
of
an
inch,
but
that's
really
available.
That's
the
good
news,
so
you
can
do
this.
A
A
Yeah,
okay:
last
some
of
the
last
things
cutting
through
very,
very
thick
steel
with
very
good
precision:
hot,
not
hot
wire.
It's
called
edm
edm
is
right.
There
didn't
cover
water,
jet
cutters,
but
they're,
very,
very
effective,
just
shooting
a
very
high
high
force
jet
of
water
to
pretty
decent
precision.
A
There's
things
like
hot
wire
cutters
for
styrofoam,
like
if
you're,
making
styrofoam
or
like
insulation
or
whatever
thermite
I'll
point
out
that
one.
That's
like
what,
if
you
want
to
cut
you're
an
underground
rebel
wanting
to
deer
out
a
train,
you
use
thermite,
but
that
thermite
is
thermite.
Is
it's
a
mixture
of
aluminum
and
something
else
I
forget
what?
But
it's
this
crazy
thing.
You
gotta
you
gotta,
google
thermite,
but.
B
A
It's
like
rust
and
aluminum
and
something
else
it's
very
common
materials,
but
you
mix
them
together
and
they
release
so
much
energy
it'll
melt
through
anything.
So
if
you
put
a
little
pot
of
that
on
a
on
a
metal
beam,
it'll
just
melt
it
in
a
second,
like
it's
crazy
stuff.
Do
you
trigger
that?
I
think
it's
just
by
mixing
those
together.
That's
it
and
they
just
start
heating
up
in
a
few
seconds
and
they
just
go
like
thermite.
I
mean.
A
A
Yeah
yeah
things
like
that
anyway,
but
for
cutting
regular
purposes.
A
A
If
you
want
to
cut
like
if
you're
cutting
metal,
that's
like
abrasive
cut
off,
is
your
it's
a
round
thing
solid
or
hollow?
The
abrasive
cutoff
does
not
worry
about
thickness
of
the
wall
of
the
material
like
thin
tubes
are
easy
to
cut
so
I
mean,
I
think
the
abrasive
cutoff
is
the
most
universal,
because
if
you
had
a
higher
performance
thing
like
the
cold
cut,
metal
saw
or
even
like
the
the
metal
blade
on
a
circular
saw.
A
The
the
tricky
part
is
the
clamp
down
part
like
the
abrasive
metal
cut
off
is
very
useful
because
you've
got
the
clamp
down.
It's
not
something
you
gotta,
like
clamp
down
some
other
way.
So
it's
generally,
it's
really
good
for
metal,
cutting
that
plus
the
iron
worker
plus
the
torch,
gets
you
just
about
anything
you
want.
A
C
A
A
Yeah,
what
are
those
three
tools?
It's
a
welder,
a
torch
and
a
grinder,
and
with
that
you
could
build
a
tractor,
you
could
build
a
torch
table.
You
can
build
our
printer,
almost
a
basic
workshop,
like
mig
welder,
a
celine
torch.
I
actually
put
mac
drill
because
that's
quite
useful
wherever
the
acetylene
torch
won't
do.
But
I
mean
you
can
do
anything
that
a
mac
drill
can
do
on
acetylene
torch.