8
internal coolant supply
DuoPlug
®
incorporated inserts
clamping flat
stock item, subject to confirmation
on request
available as long as stock lasts
latest items !
FROM PRACT ICE TO PRACT ICE
These spanner flats could be produced with increased pro-
cess reliability and without interruptions. Vibrations, occu-
ring during milling process have not caused any damage to
the cutting edges. Due to the modular threaded shank-in-
terface, this tool can be used also for other operations and
machining opportunities. Costs for refurbishing of solid
end mills and for increased availablility were avoided.
T
he company PFT – Präzisions-Fertigungstechnik GmbH
from Erwitte/Germany manufactures high precision com-
ponents according to designs and requirements of their
customers for more than 10 years; on request from materi-
al-purchase, complete operation-cycle up to final assembly.
During those operation-cycles, target-settings of tolerance-
ranges are checked, measured and recorded on the basis of
prooved process-capabilities. This fulfils several requests of
their customers. PFT is a supplier for aircraft- and space-as
well as automotive-industries. Up to the time of introducing
our
Slotworx
®
-S
-tooling, supplementary flats like spanner
flats, clearance-flats on devices etc. were machined with so-
lid carbide end mills. These tools often had too long cutting
lengths, the customer needed to stock increased quantities
in order to recognize regrinding time and he had problems
with a reduced product reliability due to very unstable
components. For these exceptional obstinate operations,
causing intense vibrations, combined with quick chipping of
cutting edges due to brittle solid carbide end mills, we have
tried our new
Slotworx
®
-tools. Our new task was: machi-
ning joining flats for fastening elements, retaining rings and
spanner flats on structural parts. Everywhere, when it was
impossible to avoid vibrations through less optimum set-up
and/or component’s prevailing conditions, tools from our
new
Slotworx
®
-S
-range can take advantages of its supe-
riority.
The milling cutter body 4 16 256 (16 mm diam., r=0.8)
could be compared easily with a solid carbide end mill, due
to the same no. of teeth and equal cutting parameters.
C
lamping flats on a rotationally symetrical component
with a nominal width of 32 mm and a required depth of
16 mm have been machined in one cut. The component was
clamped on the machine table of the Hermle milling machi-
ne, very unstably. Difficulties occurred not through the ma-
terial itself, but the job title was, to machine this component
process-reliable, with no cutting-edge chipping in sufficient
surface accuracy, despite of vibrations, activated by ineffici-
ent clamping possibilities. The smallest milling cutter body
from our
Slotworx
®
-S
-range could realize our expectations.
Refurbishing was replaced through simple turning or chan-
ging of inserts.
MACHINE
EXAMPLE FROM PRACTICE:
MATERIAL
RESULT:
PROGRAMMING SYSTEM
job description:
Hermle C 800 U
1.7225
manual
component:
spanner flats
material:
1.7225
arbor:
50 08 750 (M8, SK 40)
cutter body:
4 16 256 (16 mm diam., r = 0,8)
insert:
02 71 840 r = 08 (P40)
coating:
PVML
overhang:
78,5 mm
v
c
(speed):
180 m/min
v
f
(feed rate):
1.432 mm/min
S
(revolutions):
3.580 1/min
f
z
(feed per tooth):
0,1 mm
a
p
(depth of cut):
2,0 mm
a
e
(width of cut):
16,0 mm
chip volume:
45,8 cm
3
/min = 2,18 cu.in./min
Object 178323
slo worx
®
square shoulder face milling cutter bodies milling cutter bodies
