Experience Language - B2 - Calculating the Rotational Speed
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So
like that
berechnest
calculate
du
you
die
the
Drehzahl
rotational speed
beim
when
Bohren
drilling
How to calculate the rotational speed when drilling
Bevor
before
du
you
die
the
Drehzahl
rotational speed
für
for
einen
a
Bohrer
drill
berechnen
calculate
kannst
can
,
musst
must
du
you
zuerst
first
wissen
know
,
welchen
what
Werkstoff
material
du
you
bearbeitest
work on
.
In
in
unserem
our
Fall
case
ist
is
es
it
der
the
Stahl
steel
S235JR
S235JR
.
Before you can calculate the speed for a drill, you first need to know which material you are working on. In our case, it is the steel S235JR.
Dann
then
brauchst
need
du
you
den
the
Bohrerdurchmesser
drill diameter
und
and
du
you
musst
have
wissen
to know
,
ob
whether
der
the
Bohrer
drill
beschichtet
coated
ist
is
.
Unser
our
Beispiel
example
:
ein
an
8-Millimeter-Bohrer
8-millimeter drill
,
beschichtet
coated
.
hen you need the drill diameter and you have to know whether the drill is coated. Our example: an 8-millimeter drill, coated.
Als
as
Nächstes
next
suchst
look for
du
you
im
in the
Tabellenbuch
table book
die
the
Zugfestigkeit
tensile strength
des
of the
Werkstoffs
engineering material
.
Dazu
to this
schlägst
look
du
you
unter
under
dem
the
Bezeichnungssystem
designation system
nach
up
und
and
suchst
search for
S235JR
S235JR
.
Next, you look up the tensile strength of the material in the data book. To do this, look under the designation system and search for S235JR.
Du
you
siehst
see
dort
there
:
Das
this
ist
is
ein
a
unlegierter
unalloyed
Baustahl
structural steel
mit
with
einer
a
Zugfestigkeit
tensile strength
von
of
360
360
bis
up to
510
510
Newton
Newtons
pro
per
Quadratmillimeter
square millimeter
.
You can see there: This is an unalloyed structural steel with a tensile strength of 360 to 510 Newtons per square millimeter.
Mit
with
diesem
this
Wert
value
kannst
can
du
you
jetzt
now
die
the
Schnittgeschwindigkeit
cutting speed
Vc
Vc
bestimmen
determine
.
Auch
also
die
this
findest
find
du
you
im
in the
Tabellenbuch
table book
–
meist
usually
in
in
der
the
Tabelle
table
für
for
Bohrwerkzeuge
drilling tools
.
Using this value, you can now determine the cutting speed Vc. You can also find this in the table book—usually in the table for drilling tools.
Such
look for
dort
there
wieder
again
deinen
your
Werkstoff
material
und
and
lies
read
den
the
Mittelwert
average value
für
for
die
the
Zugfestigkeit
tensile strength
ab
off
.
Again, look for your material there and read off the average value for tensile strength.
In
in
unserem
our
Beispiel
example
ergibt
results
sich
itselfe
eine
a
Schnittgeschwindigkeit
cutting speed
von
of
50
50
Metern
meters
pro
per
Minute
minute
.
In our example, the result is a cutting speed of 50 meters per minute.
Wichtig
important
:
Schreib
write
bei
with
deiner
your
Rechnung
calculation
immer
always
die
the
Einheiten
units
mit
with
dazu
to this
–
das
that's
verhindert
avoids
Fehler
mistakes
.
Important: Always include the units in your calculation – that helps avoid mistakes.
Jetzt
now
geht's
goes it
an
to
die
the
Drehzahlformel
formula for rotational speed
.
Die
that
lautet
reads
:
n
n
=
1000
1000
⋅
Vc
Vc
/
π
π
⋅
d
Now let’s move on to the formula for rotational speed. It is: It is: n = 1000 ⋅ Vc / π ⋅ d
Das
that
heißt
means
:
Du
you
multiplizierst
multiply
Vc
Vc
mal
by
1000
1000
,
damit
so that
du
you
von
from
Metern
meters
auf
to
Millimeter
millimeters
kommst
come
–
denn
because
der
the
Bohrerdurchmesser
drill diameter
ist
is
ja
after all
in
in
Millimetern
millimeters
angegeben
indicated
.
That means: you multiply Vc by 1000 to convert from meters to millimeters – because the drill diameter is given in millimeters.
Setz
plug
dann
then
alles
everything
in
in
die
the
Formel
formula
ein
into
.
Du
you
rechnest
calculat
also
therefore
mit
with
Vc
Vc
=
50
50
m/min
m(min
und
and
d
=
8
mm
mm
–
Das
the
Ergebnis
result
ist
is
deine
your
theoretische
theoretical
Drehzahl
rotational speed
.
Then plug everything into the formula. So you calculate with Vc = 50 m/min and d = 8 mm. The result is your theoretical rotational speed.
Aber
but
Achtung
attention
:
Wenn
if
du
you
an
on
Maschinen
machines
arbeitest
work
,
die
that
nicht
not
so
so
schnell
fast
laufen
run
–
musst
have
du
you
den
the
Wert
value
anpassen
to adjust
.
But be careful: If you are working on machines that do not run so fast, you have to adjust the value.
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Experience Language - B2 - Calculating the Rotational Speed
