ISSUE
1/Original
version/OCT
2013
15
15
DRILLING
CONDITIONS
The
ease
with
which
material
can
be
drilled
depends
on
several
factors
including
tensile
strength
and
abrasion
resistance.
Whilst
hardness
and/or
strength
is
the
usual
criterion,
wide
variations
in
machineability
can
exist
among
material
showing
similar
physical
properties.
The
drilling
conditions
are
dependent
on
requirements
for
tool
life
and
surface
finish.
These
conditions
are
further
restricted
by
the
rigidity
of
the
tool
and
the
work
piece,
lubrication
and
machine
power
available.
The
harder
the
material,
the
lower
the
cutting
speed.
Some
materials
of
low
hardness
contain
abrasive
substances
leading
to
rapid
cutting
edge
wear
at
high
speeds.
Feed
rates
are
governed
by
rigidity
of
set
‐
up,
volume
of
material
to
be
removed,
surface
finish
and
available
machine
power.
THREADING
The
machine
is
equipped
with
a
reversible
direction
of
rotation
and
can
also
be
used
for
cutting
threads.
Proceed
as
follows
for
cutting
threads:
Drill
the
hole
for
the
thread
on
the
recommended
size
of
the
tap;
Switch
off
the
machine
(Fig.
2
‐
2)
and
change
the
cutter
for
the
tap
collet
and
the
machine
tap.
Keep
the
machine
in
the
same
position;
Select
the
lowest
gear
(Fig.
4)
and
lowest
speed
(Fig.
2
‐
5)
and
set
the
direction
of
rotation
to
clockwise
(right
=
R)
at
switch
(Fig.
2
‐
1);
Switch
on
(Fig.
2
‐
2)
the
machine
and
set
the
machine
tap
onto
the
drilled
hole;
Guide
the
machine
slide
down
at
the
handle
(Fig.
1
‐
2)
without
exerting;
Switch
off
(Fig.
2
‐
2)
the
machine
(just
before
the
tap
is
completely
through
the
hole)
and
set
the
direction
of
rotation
to
anti
‐
clockwise
(left
=
L)
at
switch
(Fig.
2
‐
1).
Switch
on
the
machine
(Fig.
2
‐
2)
again
and
allow
the
machine
tap
to
come
completely
out
of
the
work
piece.
Then
guide
the
motor
unit
slide
upwards
at
handles
to
avoid
damaging
the
start
of
the
thread.
DO
NOT
LET
YOUR
TAP
PUSH
UP
THE
MOTOR
UNIT
BY
ITSELF!!
COUNTERSINKING/REAMING
Thanks
to
its
wide
range
of
operating
speeds,
the
machine
can
also
be
used
for
reaming
or
counter
‐
sinking.
