HERE! - Sandvik

Drilling
Cutting fluid volume compensator
When using a drill holder with housing for cutting fluid supply
together with a Coromant Delta drill, a coolant volume compensator should be used.
A
Ordering code
Drill diameter
Dc mm
B
C
9.50-14.00
14.01-17.00
17.01-30.40
5691 020-01
5691 020-02
5691 020-03
Only for Coromant Delta drills with Coromant
Whistle Notch shanks.
Recommended maximum wear
Drill diameter
Flank wear
VB mm
Crater wear
KB mm
Zone
Dc mm
D
1
0.25
0.25
0.30
0.30
0.35
9.50 - 14.00
14.01 - 17.00
17.01 - 20.00
20.01 - 24.00
24.01 - 30.40
Zone
2
0.25
0.25
0.30
0.30
0.35
3
0.25
0.30
0.30
0.40
0.45
E
Coromant Delta
Wear definition
Zone
F
2
1
3
Drill centre
KB
Flank
VB
G
Circular
land
H
E 36
Negative
chamfer
Face
1
0.30
0.30
0.35
0.35
0.40
2
0.30
0.30
0.35
0.35
0.40
3
0.30
0.30
0.35
0.35
0.40
Chipping of the cutting edge should not
exceed “maximum wear” recommendations in order to allow for regrinding and
to obtain maximum tool life.
Drilling
Grades for Coromant Delta
K
N
20
Average
conditions
Steel
10
P20
30
K20
40
Difficult
K20
H
K20
Hardened materials
M
Aluminium / Non-ferrous
Good
P
Cast iron
01
Stainless steel
Wear resistance
K20
A
Toughness
B
Tailor Made options
Coatings
Balinit FUTURA
Wear resistant coating for steel
and cast iron
Grades
Balinit HARDLUBE
Low friction coating for long
chipping materials
C
H10F
Fine grain carbide. In combination
with Hardlube coating optimized for
stainless steel.
D
E
F
G
H
E 37
Drilling
Cutting data – Coromant Delta drill – R411.5
ISO
CMC
No.
Material
Grade
Cutting
speed
Drill diameter, mm
9.50-14
vc m/min
HB
P
A
01.0
01.1
Unalloyed steel
01.2
01.3
01.4
B
C
E
0.10-0.25% C
Non-hardened
0.25-0.55% C
Non-hardened
0.55-0.80% C
High carbon & carbon tool steel
02.1
02.2
Low alloy steel
03.11
03.22
High alloy steel
06.1
06.2
Steel castings
05.11
Non-hardened
Hardened
Annealed
Hardened steel
Unalloyed
80-170
90-200
125-225
150-225
180-225
P20
150-260
220-400
P20
150-250
250-400
P20
90-225
P20
Feed fn mm/r
75-100
0.14-0.22
0.15-0.25
0.18-0.31
70-90
0.15-0.23
0.18-0.26
0.20-0.30
55-90
0.14-0.22
0.18-0.26
0.20-0.28
35-65
0.14-0.22
0.15-0.25
0.18-0.26
40-70
0.15-0.20
0.18-0.25
0.20-0.27
40-60
0.15-0.20
0.17-0.20
0.18-0.24
70-90
0.17-0.23
0.19-0.25
0.20-0.26
50-75
0.15-0.21
0.17-0.23
0.19-0.25
25-55
0.14-0.21
0.17-0.24
0.18-0.27
25-55
0.14-0.201)
0.16-0.231)
0.19-0.251)
75-120
0.15-0.26
0.18-0.30
0.21-0.39
75-110
0.15-0.25
0.16-0.29
0.18-0.35
85-115
0.19-0.31
0.23-0.39
0.26-0.46
55-100
0.19-0.30
0.24-0.36
0.28-0.44
65-105
0.16-0.26
0.20-0.35
0.23-0.41
55-95
0.15-0.25
0.18-0.33
0.21-0.39
0.10-0.15
0.12-0.17
0.15-0.20
150-250
Stainless steel
Ferritic, Martensitic 13-25% Cr
150-270
05.21
Stainless steel
Austenitic Ni > 8%, 18-25% Cr
150-270
07.1
07.2
Malleable cast
iron
Ferritic (short chipping)
110-145
150-270
K20
08.1
08.2
Grey cast iron
Low tensile strength
150-220
200-330
K20
09.1
09.2
Nodular cast iron
125-230
200-300
K20
H
04.1
Extra hard steel
HRC
43-47
47-60
P20
N
30.12
75-150
40-100
K20
95-150
0.21-0.33
0.18-0.41
0.18-0.41
50-160
K20
45-150
0.16-0.29
0.20-0.35
0.25-0.44
K
F
G
0.05-0.10% C
Non-hardened
33.1
33.2
Pearlitic (long chipping)
High tensile strength
Ferritic
Pearlitic
Aluminium alloys
Hardened and tempered
Wrought solution treated and aged
Cast
30.21
Copper and
copper alloys
Free cutting alloys (Pb ≥ 1%)
Brass and leaded bronzes (Pb ≤ 1%)
K20
K20
25-40
15-30
H
1)
17.01-30.40
Low alloyed (alloying elements < 5%)
M
D
Non-hardened
14.01-17
If chip control is difficult to achieve with the recommended cutting data, reduce the feed to 0.08 - 0.10 mm/rev.
E 38
Drilling
Graphs – Coromant Delta drill — R411.5
Feed force
Net power
Ff = 0.5 × Dc × fn × kcfz × sinκr [N]
2
(Only for solid drilling)
Ff
[kN]
8
kW
8
6
6
4
4
2
2
0
0
0
10
15
20
30 Dc [mm]
Drill diameter
25
Dc × fn × kcfz × vc
[kW]
240 x 103
(Only for solid drilling)
Pc =
A
B
0
10
15
20
25
30 Dc [mm]
Drill diameter
C
Cutting fluid flow
[l/min]
q 16
14
12
D
Min
10
8
6
E
4
2
0
0
10
15
20
25
30
Dc [mm]
F
Drill diameter
The graphs show nominal values which should not be regarded
as strict recommendations. The values may need adjusting depending on the machining conditions e.g., the type of material.
G
Note that only net power ratings are given. Allowance must be
made for the efficiency of the machine and the cutting edge
wear.
H
E 39
Drilling
Coromant Delta drill R411.5
Drill diameter
Mounting type
Cylindrical
with flat
P M K H N
Dc
Mounting size, dmm
9.50-30.40
16, 20 , 25, 32
Cylindrical
Coromant
Whistle Notch
16, 20, 25, 32
16, 20, 25
A
Cylindrical with flat—CYLPF
Coromant Whistle Notch—CWN
Cylindrical—CYL
1= Lengths and diameters different to standard, Dc = 9.50-30.40 mm
B
2= Drill with chamfering insert, Dc = 12.25-30.40 mm
C
3= Drill with pilot, Dc = 9.50-30.40 mm
D
4= Drill with pilot and with chamfering insert, Dc = 12.25-30.40 mm
E
Options
F
Dc
Diameter—9.50-30.40 mm
Drill type
1. 3—Dc= 9.50-30.40 mm—1=standard
2. 4—Dc=12.25-30.40 mm
ch
G
l3s
D21
type 3 and 4
l21
Chamfer width—0.5-1.5 mm,
type 3 and 4
D1
Flange diameter—15-32 mm
Drill length—Drill type 1 and 2—17-158 mm
l1s
Programming length—44-175 mm,
depending on l3s, l4, l21
Drill depth—Type 1— 9.9-134.8 mm
l2
Overall length—92-236 mm, depending on l3s, l4, l21
Type 2—16.4-134.8 mm
l6
Flute length—17-172 mm,
Type 3— 9.9-116.8 mm
H
Type 4—16.4-116.8 mm
Mounting
Cylindrical shank with flat—CYLPF,
type
Cylindrical shank—CYL,
Coromant Whistle Notch—CWN
dmm
E 40
Pilot length—18.6-158 mm, only valid for
only valid for type 2 and 4
Drill type 3 and 4—17-140 mm
l4
Pilot diameter—10-31 mm, only valid for
Mounting size—see above
depending on Dc and dmm
Carbide
P20 for general steel applications
grade
K20 for stainless steel, cast iron and aluminium
H10F for stainless steel, titanium and aluminium
Coating
PVD coating: TiN, TiCN, TiALN (FUTURA),
TiALN + WC/C (HARDLUBE)
Drilling
Chamfering insert for Coromant Delta drills
Max. chamfer size 1.5 x 45°
0
3.8 -0.2
Drill dia. > 12.25 mm
10º
Drills with the chamfering insert mounted are available as
Tailor Made. See next page for detailed information.
11º
2.5 ± 0.1
A
r=1
P M K H N
90º ± 15´
45º ± 20´
4 ± 0.04
0.4 ± 0.1 × 45º
B
0
ø5 -0.02
0
4 -0.2
Ordering code
Spare parts
Insert
Tension pin (delivered with the insert).
H10F
6 ± 0.2
L142.01-05 06 00
3113 030-304
✩
Coromant
grade
C
Ordering example: 5 pieces L142.01-05 06 00 H10F
D
Building in dimensions
E
4 0
+0.2
F
0.2 ± 0.1 × 45º
ø 5H8
ø 2H8
2.1
l4
2.5 ± 0.03
G
ch × (45º)
l21 = l4 + 2.1 - ch
l21
Dc
H
l4
l21 = l4 + 2.1 - ch
l21
l4
ch max
= Position of chamfering insert
= Drill depth
= 1.5 × 45° ± 0.3
E 41
Drilling
Drill specifications
Coromant Delta
3.5 × Dc R 411.5
Cylindrical shank with flat according to ISO 9766
A
κr 70°
Drill diameter:
Hole depth:
Hole tolerance:
Surface finish:
Cutting fluid:
Tolerances:
B
9.50-30.40 mm
3.5 × Dc
IT8-9
Ra 1-2 µm
Emulsion or
Neat oil
Dc = js7
dmm = h6
l4 = Recommended drilling depth
5 × Dc R 411.5
Cylindrical shank with flat according to ISO 9766
C
κr 70°
D
Drill diameter:
Hole depth:
Hole tolerance:
Surface finish:
Cutting fluid:
Tolerances:
9.50-20.00 mm
5 × Dc
IT9-10
Ra 2-4 µm
Emulsion or
Neat oil
Dc = js7
dmm = h6
l4 = Recommended drilling depth
3.5 × Dc R 411.5
E
Whistle Notch shank
κr 70°
Drill diameter:
Hole depth:
Hole tolerance:
Surface finish:
Cutting fluid:
F
Tolerances:
G
9.50-30.40 mm
3.5 × Dc
IT8-9
Ra 1-2 µm
Emulsion or
Neat oil
Dc = js7
dmm = h6
l1s = Programming length
l4 = Recommended drilling depth
5 × Dc R 411.5
Whistle Notch shank
κr 70°
H
Drill diameter:
Hole depth:
Hole tolerance:
Surface finish:
Cutting fluid:
Tolerances:
9.50-20.00 mm
5 × Dc
IT9-10
Ra 2-4 µm
Emulsion or
Neat oil
Dc = js7
dm = h6
l1s = Programming length
l4 = Recommended drilling depth
E 42
Drilling
Indexable insert drills
CoroDrill 880 drill, Coromant U drills and T-Max U drills and trepanning tool
A
Coromant U drill R416.2
T-Max U large-diameter drill R416.9
B
C
CoroDrill 880
T-Max U stack drill R416.01
T-Max U trepanning tool R416.7
CoroDrill 880: first choice for short
hole drilling (14 – 29 mm diameters)
R416.2: tool for short hole drilling
( 12.7 – 58 mm diameters)
R416.21: step and chamfer combination drill (17.5 – 41 mm diameters)
L416.1: left-hand drill (17.5 – 58 mm
diameters)
R416.01: stack drill (27 – 59 mm
diameters)
R416.9: large-diameter drill (60 – 80
mm diameters)
R416.7: trepanning tools (60 – 110
mm diameters)
+/- 0.05 mm are kept and Wiper
technology gives good surface finsih.
With their increased capability to produce closer tolerances and better surface finish, the indexable insert drill is a
very versatile tool as regards materials,
machinery and operation.
Hole depths: up to 4 times the drill diameter (5 for Tailor made drills)
Workpiece materials: all kinds
Hole tolerances: generally – 0.1/+ 0.3
mm but CoroDrill 880 provides a
0/+ 0.25 mm tolerance, when used in
finishing operation tolerances within
With the right choice of drill - type, size
and shank, along with tool holder - most
hole making operations can today be
performed in a very efficient way. A wide
range of machine tools are used, including special-purpose machines, although
CNC lathes, turning centres and machining centres dominate with a growing
number of multi-task machines.
Today’s range of drills covers a wide variety of applications and when the right
drill has been selected, the tool can be
optimized to suit the operation. Indexable insert drills generally offer clear advantages in most respects and for holes
falling within their capability, these
should be considered as first choice for
stationary and rotating set-ups.
The indexable insert drill combines the
toughness of a steel drill-shank with the
wear resistance of cemented carbide inserts, without the need for re-grinding.
The life of the drill is long and can be applied to suit different machining demands.
Reliability and accuracy is higher than
ever, coupled with the ability to produce
good machining economics.
D
E
F
The following few application hints will
ensure smooth performance and optimum results.
G
H
Operational possibilities with indexable insert drills.
E 43
Drilling
Application hints
A
B
C
D
E
Correct alignment of the drill is vital.
There is about as many stationary drills
as rotating since they are often used in
CNC lathe turrets where the workpiece
revolves. In these cases, it is important
to ensure that the centre axis of the drill
is sufficiently aligned to the rotary axis of
the workpiece. Faulty centering – run-out
- is the most common cause of poor tool
performance and bad results.
The drill should also be set up so that
the face of the peripheral insert is parallel to the machine axis of transverse
movement.
Misalignment also has the effect of radial off-setting, which produces either an
over-sized or under-sized hole.
Rotating drill alignment can be somewhat more demanding but not difficult
if a few guidelines are followed. If there
are problems with oversize or undersize
holes or if the centre insert tends to chip
or break, the drill should be positioned
in different ways until it achieves better
results. For instance, if the drill cuts oversize in one position, it should cut undersize in another.
Turning the drill 180 degrees in its holder
may solve the described problem of hole
F
G
H
Correct drill alignment is critical.
E 44
size. In fact, various types of repositioning often lead to dimensional and alignment deviations being eliminated.
When the workpiece and drill are out of
true, due to inaccuracy in the machine,
such as spindle, chuck, tool holder or
the drill itself, the centre axis of the drill
and axis of rotation may not be sufficiently parallel which then gives rise to
inaccurate holes. In order to achieve the
tolerances of the drill capability, it is important that the centering between the
workpiece and the drill is within certain
limits:
Stationary indexable insert drills can
also generate tapered holes, with the
help of the CNC programme. Also chamfering and reliefs can be cut with the drill.
When off-setting the drill, the peripheral
insert should be parallel to the x-axis of
the machine. The peripheral insert is located on the same side as and parallel
to the flat for clamping the ISO-shank.
The position of the drill in the turret will
then determine the off-set which will increase the hole diameter.
Drilling
A
B
C
A
Possibilities with a stationary drill. (Operation C not possible with CoroDrill 880)
Preparing a hole for threading can be
done in one pass along with chamfering
(A).
Larger holes than the diameter of the
drill (B).
Drilling and finishing can be done in one
operation where boring is performed during withdrawal of the drill (C).
Possible radial adjustment depends
upon the diameter of the drill.
Hole tolerances are possible to within
+/-0.05 mm.
By presetting stationary drills, manufacturing tolerances of drill and inserts can be
eliminated and the hole tolerances on a 3 x
D drill be improved to within +/- 0.05 mm.
Radial drill adjustment
Stationary drills can be radially adjusted
from 0.8 mm to 3.5 mm depending on
drill diameter.
Moreover, if the first value (d1) is larger
than the second (d2), a funnel-shaped
hole is obtained.
In applications with a rotating drill, a funnel-shaped hole is obtained if the runout of the workpiece and drill axes cross
each other.
The relationship between values δ1 and
δ2 determines the shape of the funnelshaped hole. When δ1 corresponds with
δ2, the size of the hole becomes smaller
along half the depth of the hole and then
increases again.
If δ1 is larger than δ2, the size of the hole
becomes smaller as it proceeds from the
start of the hole. But if δ2 is larger than δ1,
the size of the hole increases.
Positioning the drill for stability can
be done when the set-up or machine is
weak. This is done by turning the drill
into the most suitable position. With a
normal tool setting, a weak set-up will
lead to the drill becoming misaligned
when the machine axes are forced out
of line. A likely consequnce is that the
centre insert is damaged.
If a somewhat oversize hole is acceptable,
a 90° rotation of the drill is recommended.
If a somewhat undersize hole can be
accepted, a 270° rotation of the drill is
recommended.
It should be noted however, that if the
drill is rotated 180°, the core diameter
increases which can damage the drill
during machining.
B
C
D
E
Off-setting of rotating drills can be done
with adjustable tool holders in a range
from -0.4 mm to +1.4 mm.
Hole diameter variations are common
if the stationary drill is misaligned. Particularly if the centre difference on engagement (δ1) is smaller than the centre
difference at the end of the hole (δ2).
F
Improving stability of stationary drill by turning the drill.
G
H
Possible mis-formation of holes with a stationary drill.
Possible mis-formation of holes with a rotating drill.
E 45
Drilling
A
A
B
C
D
Various type of initial penetration in drilling operations. All but A need initial feed reductions.
B
Initial drill penetration ...
C
D
... is an important factor for successful
drilling. One way of ensuring good hole
quality, is to make sure the penetration
surface of the workpiece is at right angles to the drill centre axis. An indexable
insert drill can, however, cope with initial
penetration of convex, concave, inclined
and irregular surfaces when accompanied with an adjustment of feed rates.
For a convex surface (A) the conditions
are relatively good since the centre of
the drill ideally makes contact with the
workpiece first, giving normal torque.
E
With an inclined surface (B) the cutting
edges will be unevenly loaded which may
result in the drill wearing prematurely. An
uneven load means that a exra stable
tool (short length in relation to diameter)
is required in order to cope with vibration
and keep within tolerances. If the angle
of the inclined surface is larger than two
degrees, the feed should be reduced to
a third of that recommended for the drill.
When entering assymetriacally curved
surfaces (D) the drill tends to bend out
from the centre, as when penetrating
against an inclined surface. The feed
should be reduced to a third of the recommended for the initial penetration of
concave surfaces.
With a concave surface (C) the drill engagement varies depending on the radius
of the concave surface and the diameter
of the hole in relation to the height of the
drill point, If the radius of the concave surface is small in relation to the hole diameter, the periphery of the drill will be engaged first. To reduce the tendency for
the drill to deflect, the feed rate should be
reduced to a third of that recommended.
When drilling into irregular surfaces (E)
there is a risk of the inserts chipping and
this may also be the case when exiting
an irregular surface. The feed rate should
therefore be rediced.
When it comes to pre-drilled holes (F) in
order to avoid deflection of the drill, the
pre-drilled hole should not be larger than
25% of the drill diameter.
F
G
H
E
Irregular surface need feed reductions and pre-drilled holes should not be larger than 25% of drill diameter.
E 46
F
Drilling
A
G
Multi-diameter hole drilling should be carried out in the right order.
B
When making a multi-diameter hole (different diameters in the same hole), (G) it
should be noted that drills are generally
not designed for counterboring, which is
the process involved. Conventional twistdrills do not provide sufficient accuracy
and modern, self-centering twist-drills have
too much room for deviation when seeking
the centre, which results in oval holes. If
indexable insert drills with asymmetric
geometry are used, deflection of the drill
can take place. These problems can be
remedied in certain cases by reducing the
feed, but the procedure of drilling the largest hole first, then the smaller one is rec-
ommended. The following hole-diameter is
then drilled from the opposite side.
When drilling crossing holes - a hole that
crosses the axis of another hole - the drill
will exit from a concave surface and then
re enter a concave surface. In the transition there is a risk of problems occurring
with chip evacuation. The safest procedure
is to drill the hole from the opposite direction. If, despite these problems, the drill is
to cross the hole in one operation great
emphasis should be placed on the stability
of the tool. When exiting from the concave
surface the front part of the drill loses the
support of the walls of the hole. The drill
then has to have the stability to provide
support until the drill head has entered the
workpiece on the other side of the hole being crossed. When crossing another hole
in the workpiece, the diameter of which exceeds a quarter of the drill diameter, the
feed rate should be reduced to a quarter
of the recommended feed rate.
C
D
E
F
G
H
Drilling crossing holes should be carried out according to operations 1 and 2. Stability of the drill is essential.
E 47
Drilling
A
B
C
Guarding against ejected discs in
through-holes is important. When drilling
through-holes in rotating workpieces with
an indexable insert drill, a disc will be
produced as the drill breakes through.
This disc is often ejected at high speed
from between the jaws of the chuck and
because the disc is sharp, it can inflict
damage or injury. It is therefore recommended that the chuck is enclosed with
an adequate guard.
If the cutting fluid contains chip particles
the slit sealings may seize and as a result
the housing will rotate. The supply tubing
will consequently be pulled round with the
housing which can cause a serious accident. A rotation stop must therefor always
be used. If the rotating connector has not
been used for a long time check that the
holder rotates in the housing before the
machine spindle is started.
Optimization for close tolerance/high
surface finish.
D
E
F
A number of factors that affect the quality of holes drilled should be looked at
when hole quality levels are high:
- the machine tool needs to be in a good
condition. Wear and misalignment in the
spindle will affect accuracy. Stability generally is important.
- the condition of the drill should be monitored regularily throughout its tool-life to establish a safe and predictable tool-life. Unsuitable tool wear and any risk of cutting
edge breakdown should be eliminated.
- chipbreaking and chip evacuation must
always be satisfactory.
G
H
- choice and setting of drill type and insert geometry affect quality of holes.
- as regards obtaining high straightness
accuracy, especially for deeper holes, the
best result is obtained when both the
workpiece and drill rotate. Alternatively, a
rotating workpiece with a stationary tool
is satisfactory.
E 48
Safety against dangerous discs.
Rotating stop is an important measure.
Drilling
On trepanning set-ups, stationary drills
must not be offset from the workpiece centre line, with reference to the peripheral
insert, by more than -0.15 mm. The peripheral cutting edge (P) should be set to within
+0.1 mm in the horizontal plane from centre-line of spindle (CL). On stationary tool
applications, the drill should be positioned
with the inserts on the horizontal axis. The
peripheral insert must be set 0.20 mm behind the inner cartridge by means of the
axial adjusting screw of the peripheral cartridge.
Core handling usually does not represent
a problem for short hole depths, particularly with stationary tools. Coolant flow and
pressure are normally adequate to safeguard the cutting edges from being chipped
due to the falling core (C).
When heavy and long cores are produced a drilled hole into the core with a
rigid plunger or plug can be made to support the core from falling. The diameter
of the drilled hole should be a little larger
than the diameter of the plug. The unit is
housed in a seal cup which is externally
fixtured. If the fixture is fitted with a core
support, the drill should be mounted with
the cartridges located on the vertical
axis. Supports for the core may be required to ensure its stability on breakout,
and to protect the cutting edges.
0.15
±0.1
A
B
Setting stationary trepanning tools.
C
D
C
E
Core handling in trepanning.
F
G
H
E 49
Drilling
Cutting fluid
A
B
C
D
E
F
G
The cutting fluid supply in drilling is an
important factor for successful performance. Chip evacuation and lubrication
between drill and hole-wall are the primary functions which have to be supported. Cutting fluid pressure and volume define the supply and are shown in
nominal values. These values are not
strict overall and may need adjustment
depending on machining conditions.
Recommended minimum pressures are
indicated in diagrams relative to drill diameter for stationary and rotating drills. It
should also be noted that there is always
a drop in pressure along pipes between
pump and drill and that the minimum
pressure is achieved at the drill point.
A simple minimum pressure indicator is
for a horizontal drill to have a stream of
cutting fluid coming out of the drill supply-holes without any downward drop for
at least 30 cm. Smaller drill diameters
need higher pressure. While volume is
less, the cutting fluid pressure is critical
for smooth chip evacuation at the high
speeds of small high-performance drills.
While modern CNC machines usually
have adequate cutting fluid pressure and
volume, some machines can have pressure raised through compressed air coupled to the system.
Large-diameter drills need larger volumes of cutting fluid, while the pressure
requirement becomes less as diameters
increase. The cubic capacity of cutting
fluid tank should be between 5-10 times
larger than the volume of fluid that the
pump supplies per minute.
The volume capacity can be checked
using a stop-watch and a suitably sized
bucket. A hose can be fitted over the drill
and the pump turned on to check the
time taken to pump a certain volume.
H
E 50
q
[l/min]
60
20
15
10
5
50
0
12.7
20
40
30
c.
Re
20
.
Min
10
0
0
12.7 20
30
40
50
60
70
80
Cutting fluid flow – drilling
q
[l/min]
70
60
c.
Re
50
40
.
in
M
30
20
0
0
Cutting fluid flow – trepanning
60
70
80
90
100
110 Dc [mm]
Dc [mm]
Drilling
Insert wear
Chipping of cutting edges can be caused
by various circumstances:
- off-centre drill
- drill deflection caused by excessive
tool overhang, feed rate or drill length
- poor insert stability due to incorrect
seating in drill or damaged seat and
screws
- poor drill stability due to wrong tool
holding, poor spindle or turret condition and alignment
- poor machine and workpiece stability
- cutting fluid supply insufficient
- incorrect inserts, grade or geometry
not suitable for demands at centre and
peripheral cutting edges
A
Chipping
B
Flank wear
If chipping occurs on the cutting edges
of a regrindable cemented carbide twistdrill, type Coromant Delta, a change to
indexable insert drill should be considered, especially if instability prevails. The
option of tougher edges on an indexable
insert drill is in some cases a solution to
the problem.
C
Creater wear
D
Chipping of cutting edges should never be
allowed to occur, instead it should be taken as an indication that something needs
rectifying in the machining process.
The two most common types of tool wear
are flank wear and crater wear. The
former is normally the natural wear pattern, especially on the periphery insert,
where higher cutting speed prevails. This
wear will eventually lead to the insert
cutting edge not maintaining the tolerance and/or surface finish required for
the operation, when a finished criterion
is required.
For drilling operations, where finish and
accuracy are not within particularly close
limits, flank and crater wear should not
be allowed to go beyond certain values
for production security. Excessive wear
will lead to increasing friction and incorrect cutting geometry, resulting in higher
forces and poor chip information. It will
also lead to a higher risk of cutting edge
fracture.
E
F
Drill adaptor for silent drilling
To improve the work environment this patented dampened adaptor has been developed and it should be used with Coromant U indexable insert drills in specific
applications where high pitch noise is a problem.
G
It is available for Coromant Capto, ISO taper 7388/1 and
MAS-BT40 and 50.
Every single adaptor will be individually
optimised for the drill size requested.
H
E 51
Drilling
Application procedure for new operations
An application routine can be adopted for setting up new
operations or for new workpiece materials to ensure satisfactory operation. Performance, chip-control, -evacuation
and hole-quality can be checked at the start.
A
B
• Make sure which insert cutting edge leads the drill. Measure at end of drill to see which insert protrudes furthest
axially, to establish the point position of the drill for programming.
• Start drilling with the minimum recommended feed rate
for the drill in question, to a depth of just a few mm. Check
chip formation and measure hole size. Also inspect the
drill to make sure no drill-to-hole rubbing is taking place.
• Increase feed rate in increments of 0.015 mm to arrive at
optimum machining rates.
C
D
• Drill a hole to about 10 mm in depth to analyze and then,
if positive complete the hole.
• Check the power needed on the machine during drilling
for any surges or flickering in power reading. These may
indicate chip congestion.
• Feed rates can be raised but not lowered during an operation. Long, uncontrolled chips may be the result of a
lower feed with subsequent chip congestion or damaged
hole.
E
F
On the other hand, excessive feed rates can lead to drill
deflection, giving rise to incorrect holes, poor cutting action
and rubbing between drill and hole wall. Avoid the use of the
feed over-ride on the machine while the drill is in cut.
• Deflection of component, fixture or machine can lead to
excessive sudden feed force increases, as the drill breaks
out of a through-hole being drilled.
G
H
E 52
Drilling
Benefits of using a modern indexable insert drill ...
... in comparison to out-dated conventional indexable drills, carbide
tipped drills, spade drills and high speed steel twist-drills there are several areas in the diameter range 12.7 to 110 mm where benefits can
be obtained:
A
- shorter cycle times
- lower machining costs
- less machine down-time
- improved utilization of production resources
- higher production security
B
- longer tool-life and more consistent performance
- extended hole-quality area of indexable insert drills
- simple to use and maintain
- lower tool inventory
- lower power consumption
- more suitable for poor-stability set-ups/components
C
- versatile as regards workpiece materials and machinery
Drill characteristics that contribute to benefits:
D
- faster penetration rate (feed and cutting speed)
- smaller axial feed force
- no peck-drilling necessary
- self-centering
- applicable for varying workpiece conditions/hole demands
E
- diameter-variation possibilities with one drill
- finishing bore-stroke possible on drill withdrawal
- one grade/one geometry covers many applications
- optimization possibilities with dedicated insert grade/geometries
- twin coolant holes leading supply to cutting edges
F
- specially developed helical flutes, providing unrestricted chip evacuation and high stability
- large chipbreaking area, chip size and shape less limited
- good for long-chipping materials, stainless steel, etc.
- strong insert cutting edges with long, predicable tool-life
- no regrinding
G
- individual design and identification of centre and peripheral inserts
- choice of drill shanks and Coromant Capto integrated drills
- large, developing programme
H
E 53
Drilling
CoroDrill 880 indexable insert drill – new generation drilling
- First choice drill for high productivity providing good machining
economy
- Improved hole quality providing broader application range for
indexable insert drills.
A
- High machining security through unique cutting action and efficient chip evacuation
B
Basic features
Diameter range: 14 to 29.5 mm (a growing range)
Radial adjustment: steps of 1.0 mm for 2xD and 4xD; 0.5 for
3xD
Length to diameter alternatives: 2xD, 3xD and 4xD
Coolant supply and type: internal, emulsion; pressure: 6 – 10
bar; volume: 10 – 50 l/min
C
Hole tolerance: 2 – 3xD: 0/0.25 mm; 4 – 5xD: 0/0.40 mm.
Thread holes.
Surface finish: Ra 2 – 4 microns
Flat bottom holes are produced.
D
E
F
G
H
Operational versatility
Rotating and stationary drill in most machine tool types. As a
rotating drill hole machining can be performed through drilling,
boring, helical interpolation and plunge drilling. Angular, concave, convex and irregular surfaces can be entered, and cross
drilling carried out, in most cases necesitating feed reductions
of a quarter of that recommended – see general application
hints for indexable insert drilling. Entering of surface angles
up to 89 degrees is possible with the CoroDrill 880. A finishing
return pass, with the drill boring on its way back out of the hole
is not possible with the 880-drill as it is with the Coromant U
drill. The 880-drill can however perform a boring operation on
straight and tapered holes on a forward pass.
A stationary drill can also machine chamfers on holes in one
pass, such as when preparing holes for threading. Boring of
straight and tapered holes can be performed but no finishing
passes on the return stroke.
Improving hole quality...
... can be achieved by pre-setting a non-rotating drill in the machine or a rotating drill in an adjustable holder. In so doing, the
manufacturing tolerances of the tool will be compensated for
and only the insert indexing will influence the effect of the drill
diameter on the hole dimension.
This means that hole tolerances inside +/- 0.05 mm can be
achieved with 2xDc drills.
If high surface finish is required, a lower feed can be applied
(fn about 0.05 mm/rev) in combination with a high cutting
speed. Surface finish values as small as Ra 0.5 microns can
be achieved in steel under normal conditions.
E 54
The sound level...
... of the drill during machining can be influenced by various
measures. The drill diameter and length; the tool holder and
overhang; the spindle stability; the workpiece fixturing; the
machine tool, the cutting data – higher feed and lower cutting
speed may lower the sound level; the insert geometry; the use
of a Silent Tool tuned drill adapter.
Drilling
TOOLING ALTERNATIVES
Convetional turrets
Clamping alternatives
– shank type
– VDI
– hydraulic
If these turrets are equipped with Coromant’s clamping
units, all types of tools can be applied.
A
Coromant Capto quick change system
• Best choice when quick change is required.
• A wide offer of clamping units and drills
• Best choice for economy
B
Conventional, cylindrical shank tools
• Easy to install in all conventional turrets
C
Coromant Capto integrated Multi-task machines
Modular tooling with Coromant Capto
The Coromant Capto modular tooling system can easily be
integrated into Multi-task machines.
D
Take advantage of the strength of Coromant Capto, offering
optimal performance in both rotating and non-rotating
applications.
E
F
G
H
E 55
Drilling
General information – CoroDrill 880
Insert grades
A
B
for Central insert
for Peripheral insert
Grade GC1044
ISO P, M, K, N, S and H PVDcoated grade with layered
TiAlN-coating contributing to
a good edge security. The
substrate is a submicron
cemented carbide with good
balance of toughness and
wear resistance. Basic
choice for mixed production.
Grade GC4014
ISO P Finishing to light
roughing of steel and steel
castings. Low to medium
feed rates at very high
cutting speed. High wear
resistance and good resistance to plastic deformation
permits high metal removal
rates.
ISO K Very good grade for
high high cutting speeds in
stable conditions.
C
Grade GC4024
ISO P Basic chioce with
excellent toughness behaviour and very high wear
resistance. For moderate to
high cutting speeds. MT-CVD
coated grade.
ISO M Excellent edge
toughness and very high
wear resistance. Very good
resistance against build-up
edges. For medium to high
cutting speeds. MT-CVD
coated grade.
D
ISO K Very good combination
of toughness and wear
resistance. Universal grade
for medium to high cutting
speeds. MT-CVD coated grade.
E
ISO H Good toughness
behaviour and high wear
resistance. For moderate to
high cutting speeds. MT-CVD
coated grade.
F
G
Central insert
H
E 56
Peripheral insert
Grade GC4044
ISO P, M, K, N, S and H PVDcoated grade with layered
TiAlN-coating contributing to
a good edge security. The
substrate is a submicron
cemented carbide with good
balance of toughness and
wear resistance. Basic
choice for mixed production.
Drilling
Grades for CoroDrill 880
Peripheral insert grades (always black colour)
P
K
P
M
P
M
K
K
GC4014
The choice for high cutting speeds,
excellent wear resistance in steel and cast iron.
H
GC4024
The basic choice,
for most materials.
N
GC4044 The tough choice,
excellent toughness behaviour in most materials
S
H
A
Central insert grades (always bronze colour)
P
M
K
N
S
B
GC1044 The basic choice,
for all materials.
H
C
Insert geometries for peripheral and central inserts for CoroDrill 880
The high feed choice,
– general geometry for steel and cast iron.
Roughing, insert with strong, reinforced edge.
P
K
P
M
K
N
S
H
P
M
S
D
The basic choice,
– general geometry for most materials.
Medium feed.
E
The choice for Long chipping materials
– low carbon steel and stainless steels.
Medium feed, insert with sharp positive edge.
N
F
CoroDrill 880
G
Wear resistance
01
P
M
K
N
S
H
10
20
4014
4014
4024
4024
30
40
1044
4044
1044
4044
4024
1044
4044
1044
4044
1044
4044
4024
H
1044
4044
50
Toughness
E 57
Drilling
Specifications for CoroDrill 880
2 - 3 × Dc
Drill diameter 20.00 – 29.50 mm
Cylindrical shank
Drill
dia.
Max radial
adjustment
Flat according to ISO 9766
Dc mm
A
l1s = programming length
Hole tolerance
Tolerance, Dc
B
Max hole depth, l4
±0.00/+0.25 mm
2 × Dc ± 0.1 mm
3 × Dc ± 0.1 mm
2 – 3 x Dc
C
D
4 × Dc
E
Drill diameter 20.00 – 29.00 mm
F
G
H
E 58
Hole tolerance
±0.00/+0.40 mm
Tolerance, Dc
± 0.1 mm
Max hole depth, l4
4 x Dc
l1s = programming length
Dc
20
20.5
20.9
21
21.5
22
22.5
23
23.5
23.9
24
24.5
25
25.5
26
26.4
26.5
27
27.5
28
28.5
29
29.4
29.5
+0.9
+0.8
+0.8
+0.8
+0.7
+0.6
+0.5
+0.5
+0.4
+0.3
+1.1
+1.0
+1.0
+0.9
+0.9
+0.8
+0.8
+0.7
+0.6
+0.6
+0.5
+0.5
+0.4
+0.4
21.8
22.2
22.4
22.6
22.9
23.3
23.5
24.0
24.3
24.5
26.2
26.5
27.0
27.3
27.8
28.0
28.1
28.4
28.7
29.2
29.5
30.0
30.2
30.3
Drill
dia.
Max radial
adjustment
Dc mm
20
21
22
23
24
25
26
27
28
29
+0.9
+0.8
+0.6
+0.5
+1.1
+1.0
+0.9
+0.7
+0.6
+0.5
Dc
21.8
22.6
23.2
24.0
26.2
27.0
27.8
28.4
29.2
30.0
Drilling
Inserts for CoroDrill 880
Central insert
Peripheral insert
880-04…C
Dc 20 – 23.99 mm
880-04…P
Dc 20 – 23.99 mm
880-05…C
Dc 24 – 29.99 mm
880-05…P
Dc 24 – 29.99 mm
A
= Central insert
Dimensions, mm
Insert
size
= Peripheral insert
Insert code
Ic
s
d1
rε
B
Central insert
Medium feed
04
05
880- 040305H-C-LM
6.8
2.8
2.8
0.5
040305H-C-GM
6.8
2.8
2.8
0.5
880- 050305H-C-LM
8.4
3
3.2
0.5
050305H-C-GM
8.4
3
3.2
0.5
880- 0403W07H-P-LM
7.4
2.8
2.8
0.7
0403W05H-P-GM
7.4
2.8
2.8
0.5
880- 0503W08H-P-LM
8.9
3
3.2
0.8
0503W05H-P-GM
8.9
3
3.2
0.5
880- 040305H-C-GR
6.8
2.8
2.8
0.5
880- 050305H-C-GR
8.4
3
3.2
0.5
880- 0403W07H-P-GR
7.4
2.8
2.8
0.7
880- 0503W08H-P-GR
8.9
3
3.2
0.8
Peripheral insert
04
05
C
High feed
Central insert
04
05
D
Peripheral insert
04
05
E
F
G
H
Rotating drill
Stationary drill
E 59
Drilling
Cutting data for CoroDrill 880
ISO
CMC Material
HB
P
C
D
M
E
F
G
S
H
N
-LM
(m/min)
-GR
-LM
Drill length 4xD
-GM
-GR
Dc mm
fnmm/rev.
fn mm/rev.
fn mm/rev.
fn mm/rev.
fn mm/rev.
fnmm/rev.
220-400
230-380
190-235
20.00-23.99
24.00-29.99
0.04-0.12
0.04-0.12
0.04-0.08
0.04-0.08
0.04-0.08
0.04-0.08
0.04-0.12
0.04-0.12
0.04-0.08
0.04-0.08
0.04-0.08
0.04-0.08
Unalloyed steel (Non hardened)
0.05-0.10% C
80-170
01.1
Non hardened
0.05-0.25% C
90-200
4014*
4024
4044
235-380
225-345
165-220
20.00-23.99
24.00-29.99
0.04-0.14
0.04-0.14
0.04-0.10
0.04-0.10
0.04-0.08
0.04-0.08
0.04-0.14
0.04-0.14
0.04-0.10
0.04-0.10
0.04-0.08
0.04-0.08
01.2
Non hardened
0.25-0.55% C
125-225
4014*
4024
4044
200-320
190-290
120-180
20.00-23.99
24.00-29.99
0.06-0.14
0.06-0.14
0.06-0.18
0.06-0.18
0.12-0.26
0.12-0.30
0.06-0.14
0.06-0.14
0.06-0.18
0.08-0.18
0.12-0.20
0.12-0.22
01.3
Non hardened
0.55-0.80% C
150-225
4014*
4024
4044
175-305
170-275
105-175
20.00-23.99
24.00-29.99
0.06-0.14
0.06-0.14
0.06-0.18
0.06-0.18
0.12-0.26
0.12-0.30
0.06-0.14
0.06-0.14
0.06-0.18
0.08-0.18
0.12-0.20
0.12-0.22
01.4
High carbon & carbon tool steel
180-275
4014*
4024
4044
175-300
200-275
105-170
20.00-23.99
24.00-29.99
0.06-0.14
0.06-0.14
0.06-0.18
0.06-0.18
0.12-0.26
0.12-0.30
0.06-0.14
0.06-0.14
0.06-0.18
0.08-0.18
0.12-0.20
0.12-0.22
02.1
Low-alloy steel (Non hardened)
150-260
4014*
4024
4044
175-320
180-290
115-180
20.00-23.99
24.00-29.99
0.06-0.14
0.06-0.14
0.06-0.18
0.06-0.18
0.12-0.26
0.12-0.30
0.06-0.14
0.06-0.14
0.06-0.18
0.08-0.18
0.12-0.20
0.12-0.22
02.2
Hardened steel
220-450
4014*
4024
4044
150-255
90-230
75-140
20.00-23.99
24.00-29.99
0.06-0.14
0.06-0.14
0.06-0.18
0.06-0.18
0.12-0.22
0.12-0.26
0.06-0.14
0.06-0.14
0.06-0.18
0.08-0.18
0.12-0.20
0.12-0.22
03.11
High-alloy steel (Annealed)
50-250
4014*
4024
4044
155-300
160-275
100-170
20.00-23.99
24.00-29.99
0.06-0.14
0.06-0.14
0.06-0.18
0.06-0.18
0.12-0.26
0.12-0.30
0.06-0.14
0.06-0.14
0.06-0.18
0.08-0.18
0.12-0.20
0.12-0.22
03.21
Hardened steel
250-450
4014*
4024
4044
100-215
80-200
70-125
20.00-23.99
24.00-29.99
0.06-0.14
0.06-0.14
0.06-0.18
0.06-0.18
0.12-0.22
0.12-0.26
0.06-0.14
0.06-0.14
0.06-0.18
0.08-0.18
0.12-0.20
0.12-0.22
06.1
Steel castings (Unalloyed)
90-225
4014*
4024
4044
190-350
140-310
125-190
20.00-23.99
24.00-29.99
0.04-0.08
0.04-0.08
0.04-0.10
0.04-0.10
0.04-0.14
0.04-0.14
0.04-0.08
0.04-0.08
0.04-0.10
0.04-0.10
0.04-0.14
0.04-0.14
06.2
Low alloyed (alloying
elements less than 5%)
150-250
4014*
4024
4044
125-265
110-250
100-150
20.00-23.99
24.00-29.99
0.06-0.14
0.06-0.14
0.06-0.18
0.06-0.18
0.12-0.26
0.12-0.30
0.06-0.14
0.06-0.14
0.06-0.18
0.08-0.18
0.12-0.20
0.12-0.22
05.11
Stainless steel Ferritic/
Martensitic 13-25% Cr
150-270
4024
4044
120-265
115-165
20.00-23.99
24.00-29.99
0.06-0.18
0.06-0.18
0.06-0.14
0.06-0.14
0.06-0.14
0.06-0.14
0.06-0.16
0.06-0.16
0.06-0.14
0.06-0.14
0.06-0.14
0.06-0.14
05.21
Austenitic Ni>8% 13-25% Cr
150-275
4024
4044
120-250
115-180
20.00-23.99
24.00-29.99
0.06-0.16
0.06-0.16
0.06-0.12
0.06-0.12
0.06-0.12
0.06-0.12
0.06-0.14
0.06-0.14
0.06-0.12
0.06-0.12
0.06-0.12
0.06-0.12
05.51
05.52
Austenitic/Ferritic (Duplex)
180-320
4024/4044
90-145
85-125
20.00-23.99
24.00-29.99
0.06-0.16
0.06-0.16
0.06-0.12
0.06-0.12
0.06-0.12
0.06-0.12
0.06-0.14
0.06-0.14
0.06-0.12
0.06-0.12
0.06-0.12
0.06-0.12
15.21
Austenitic castings
150-250
4024
4044
120-250
115-180
20.00-23.99
24.00-29.99
0.06-0.16
0.06-0.16
0.06-0.12
0.06-0.12
0.06-0.12
0.06-0.12
0.06-0.14
0.06-0.14
0.06-0.12
0.06-0.12
0.06-0.12
0.06-0.12
07.1
Malleable cast iron
Ferritic (short chipping)
110-145
4014
4024
4044
140-255
140-230
80-145
20.00-23.99
24.00-29.99
0.08-0.14
0.08-0.14
0.10-0.18
0.10-0.20
0.14-0.28
0.16-0.32
0.08-0.14
0.08-0.14
0.10-0.18
0.10-0.20
0.14-0.19
0.16-0.25
07.2
Pearlitic (long chipping)
150-270
4014
4024
4044
100-185
105-170
65-105
20.00-23.99
24.00-29.99
0.08-0.14
0.08-0.14
0.10-0.16
0.10-0.18
0.12-0.24
0.14-0.28
0.08-0.14
0.08-0.14
0.10-0.16
0.10-0.18
0.12-0.18
0.14-0.22
08.1
Grey cast iron
Low tensile strength
150-220
4014
4024
4044
225-345
210-310
130-195
20.00-23.99
24.00-29.99
0.08-0.14
0.08-0.14
0.10-0.18
0.10-0.20
0.14-0.28
0.16-0.32
0.08-0.14
0.08-0.14
0.10-0.18
0.10-0.20
0.14-0.19
0.16-0.25
08.2
High tensile strength
200-330
4014
4024
4044
110-250
125-230
75-140
20.00-23.99
24.00-29.99
0.08-0.14
0.08-0.14
0.10-0.16
0.10-0.18
0.12-0.24
0.14-0.28
0.08-0.14
0.08-0.14
0.10-0.16
0.10-0.18
0.12-0.18
0.14-0.22
09.1
Nodular cast iron (Ferritic)
150-230
4014
4024
4044
120-235
125-215
80-135
20.00-23.99
24.00-29.99
0.08-0.14
0.08-0.14
0.10-0.16
0.10-0.18
0.12-0.24
0.14-0.28
0.08-0.14
0.08-0.14
0.10-0.16
0.10-0.18
0.12-0.18
0.14-0.22
09.2
Pearlitic
200-330
4014
4024
4044
100-215
110-200
70-125
20.00-23.99
24.00-29.99
0.08-0.14
0.08-0.14
0.10-0.16
0.10-0.18
0.12-0.24
0.14-0.28
0.08-0.14
0.08-0.14
0.10-0.16
0.10-0.18
0.12-0.18
0.14-0.22
04.1
Hardened and tempered
450
4024
30-80
20.00-23.99
24.00-29.99
0.05-0.14
0.05-0.14
0.07-0.18
0.07-0.18
0.05-0.14
0.05-0.14
0.05-0.12
0.05-0.12
0.07-0.15
0.07-0.15
0.05-0.12
0.05-0.12
20.21
20.22
20.24
Heat resistant alloys, Ni Based
140-425
4044
15-25
20.00-23.99
24.00-29.99
0.05-0.08
0.06-0.10
0.05-0.10
0.06-0.12
0.05-0.08
0.06-0.08
0.04-0.08
0.05-0.10
0.05-0.08
0.06-0.10
0.05-0.08
0.06-0.08
23.21
23.22
Ti alloys
Rm (Mpa)
600-1500
4024/4044
40-50
20.00-23.99
24.00-29.99
0.08-0.16
0.12-0.18
0.08-0.14
0.10-0.16
0.08-0.12
0.10-0.14
0.08-0.14
0.10-0.16
0.06-0.12
0.08-0.14
0.08-0.12
0.10-0.14
30.12
Al. alloys Wrought or
wrought and aged
30-150
4044
300-385
20.00-23.99
24.00-29.99
0.06-0.16
0.10-0.18
0.06-0.18
0.10-0.20
0.06-0.16
0.10-0.18
0.06-0.14
0.10-0.16
0.06-0.16
0.10-0.18
0.06-0.14
0.10-0.16
30.21
Cast, non aging
40-100
4044
300-385
20.00-23.99
24.00-29.99
0.06-0.16
0.10-0.18
0.06-0.18
0.10-0.20
0.06-0.16
0.10-0.18
0.06-0.14
0.10-0.16
0.06-0.16
0.10-0.18
0.06-0.14
0.10-0.16
30.22
Cast or cast and aged
70-140
4044
250-335
20.00-23.99
24.00-29.99
0.06-0.16
0.10-0.18
0.06-0.18
0.10-0.20
0.06-0.16
0.10-0.18
0.06-0.14
0.10-0.16
0.06-0.16
0.10-0.18
0.06-0.14
0.10-0.16
33.1
Copper and copper alloys
50-160
4044
250-380
20.00-23.99
24.00-29.99
0.06-0.16
0.10-0.18
0.06-0.18
0.10-0.20
0.06-0.16
0.10-0.18
0.06-0.14
0.10-0.16
0.06-0.16
0.10-0.18
0.06-0.14
0.10-0.16
33.2
Brass and leaded alloys
(Pb <1%)
50-160
4044
180-230
20.00-23.99
24.00-29.99
0.06-0.16
0.10-0.18
0.06-0.18
0.10-0.20
0.06-0.16
0.10-0.18
0.06-0.14
0.10-0.16
0.06-0.16
0.10-0.18
0.06-0.14
0.10-0.16
* Only in -GM geometry.
E 60
Geometry/Feed
Drill length 2-3xD
-GM
01.0
K
H
Peripheral
insert
Drill
diameter
4014*
4024
4044
A
B
Cutting
speed
Grade
Note: Bold text is recommended grade, geometry and cutting data. Central insert grade is always 1044.
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