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CoroBore® BR30

Three-edge rough boring tools for maximum productivity

Application tips

Off-centre holes

If the centre lines of the pre-machined hole and the boring tool are not concentric, the cutting depth could be very large on one side of the hole.
A good solution for these applications is step boring in order to be able to take the large depth of cut. Unsymmetrical cutting forces might bend the tool and cause some small remaining off centre or vibrations, especially when long overhang tool assemblies are used.

Sand inclusions

Sand inclusions in cast components increase the wear on the inserts.
Recommendations:

• Choose a tough grade

• Reduce cutting data

• Choose a strong square negative basic-shaped insert for improved process security and minimized wear.

Blind hole

When machining a blind hole it is very important to secure that proper chip evacuation takes place.

• Correct cutting data is essential to achieve proper chip forming
• Check that the chips do not jam or wear the inserts

• Coolant pressure and flow should be sufficient to evacuate the chips

• Vertical machines are more critical than horizontal machines for efficient chip evacuation

Interrupted cuts

Machining of interrupted cuts, such as cross holes, set high demands on insert cutting conditions.

• Choose a tough grade

• Choose a strong, square negative basic-shaped insert for improved process security, valid for stable conditions

• Reduce cutting data if there are severe interruptions

Recommendations

Cutting data

General recommendations rough boring:

  • Starting data: vc 200 m/min (valid when vc on insert box is bigger than vc 200 m/min) at short overhang. Check insert box for feed and depth of cut recommendations
  • vc = 50% of recommended data on label. If vibrations occur, reduce speed and increase feed. Do not use max recommended feed and ap at the same time
Machine limitations:

Always make sure the machine can provide the required torque and power for the specific boring application.


Cutting data: CoroBore® 111

Order code Grade Feed range (fn) Depth of cut (ap) Cutting speed (vc)
Min Max Recommended Min Max Recommended Min Max Recommended
SPMT0606-BR 4325 0.10 0.25 0.20 0.6 4.5 2.0 365 460 395
SPMT0606-BM 2025 0.10 0.15 0.10 0.6 4.5 1.8 260 265 265
SPMT0606-BR 3210 0.15 0.30 0.25 0.6 4.5 2.0 285 330 300
SPMT0606-BM 1145 0.10 0.15 0.10 0.6 4.5 1.8 15 20 20
SPMT0808-BR 4325 0.15 0.35 0.20 0.8 6.5 2.5 325 425 395
SPMT0808-BM 2025 0.10 0.25 0.20 0.8 6.5 2.2 225 265 240
SPMT0808-BR 3210 0.20 0.50 0.30 0.8 6.5 2.5 235 315 285
SPMT0808-BM 1145 0.10 0.15 0.10 0.8 6.5 2.2 15 20 20
SPMT1212-BR 4325 0.15 0.40 0.25 1.2 9.0 3.0 305 425 365
SPMT1210-BM 2025 0.10 0.30 0.20 1.0 9.0 2.5 205 265 240
SPMT1212-BR 3210 0.20 0.50 0.30 1.2 9.0 3.0 235 315 285
SPMT1210-BM 1145 0.10 0.20 0.15 1.0 9.0 2.5 10 20 15
SPMT1812-BR 4325 0.20 0.40 0.30 1.2 1.0 3.8 305 395 345
SPMT1810-BM 2025 0.20 0.30 0.25 1.0 12.0 3.0 205 240 225
SPMT1812-BR 3210 0.25 0.50 0.30 1.2 12.0 3.8 235 300 285
SPMT1810-BM 1145 0.10 0.20 0.15 1.0 12.0 3.0 10 20 15

Tightening torque

Insert screw

ISO ANSI Non ISO Code Size Torx Plus Nm Ft/lbs
CC06 CC2(1.5)   5513 020-03 M2,5 7IP 0.9 0.7
CC09 CC09   5513 020-09 M3,5 15IP 3.0 2.2
CC12 CC43   5513 020-17 M4x0,5 15IP 3.0 2.2
  SP06 5513 020-33 M2,2 7IP 0.8  0.59
SP08 5513 020-57 M3 9IP 1.7  1.25
SP12 416.1-833 M3,5 10IP 2 1.48 
SP18 5513 020-25 M4 15IP 3 2.2
SN15 SN54   5512 086-03 M6 20IP 6.4 4.7

CoroBore® BR30​​

 ​​​ Insert 90° Insert 84°
Size DCN (mm) DCX (mm) ISO ANSI Nm Ft/lbs Screw size ISO ANSI Non-ISO Nm Ft/lbs Screw size
A 35 40.5 CC06 CC2(1.5) 4.8 3.5 M 4   SP06 4.8 3.5 M 4
39.5 45 CC06 CC2(1.5) 4.8 3.5 M 4 SP06 4.8 3.5 M 4
B 44 50.5 CC06 CC2(1.5) 9 6.6 M 4 SP06 9 6.6 M 4
49.5 56 CC06; CC09 CC2(1.5);CC3(2.5) 9 6.6 M 5 SP08 9 6.6 M 5
C 55 63 CC09 CC3(2.5) 16 11.8 M 6 SP08 16 11.8 M 6
62 70 CC09; CC12 CC3(2.5);CC43 16 11.8 M 6 SP12 16 11.8 M 6
D 69 78.5 CC12 CC43 16 11.8 M 6 SP12 16 11.8 M 6
77.5 87 CC12 CC43 16 11.8 M 6 SP12 16 11.8 M 6
E 86 97 CC12 CC43 38 28 M 8 SP12 38 28 M 8
96 107 CC12 CC43 38 28 M 8 SP12 38 28 M 8
F 106 122 CC12 CC43 75 55.3 M 10 SN12 SN43 SP13 75 55.3 M 10
121 137 CC12 CC43 75 55.3 M 10 SN13 SN44 SP14 75 55.3 M 10
G 136 152 CC12 CC43 75 55.3 M 10 SN14 SN45 SP15 75 55.3 M 10
151 167 CC12 CC43 75 55.3 M 10 SN15 SN46 SP16 75 55.3 M 10
H 166 191 CC12; CN16 CC43; CN54 75.0; 120,0 55.3;88.5 M 10;M 12 SN15 SN54 SP17 75.0;120,0 55.3;88.5 M 10;M 12
189 214 CC12; CN16 CC43; CN54 75.0; 120,0 55.3;88.5 M 10;M 12 SN16 SN55 SP18 75.0;120,0 55.3;88.5 M 10;M 12
I 212 237 CC12; CN16 CC43; CN54 75.0; 120,0 55.3;88.5 M 10;M 12 SN17 SN56 SP19 75.0;120,0 55.3;88.5 M 10;M 12
235 260 CC12; CN16 CC43; CN54 75.0; 120,0 55.3;88.5 M 10;M 12 SN18 SN57 SP20 75.0;120,0 55.3;88.5 M 10;M 12
IX 258 283 CC12; CN16 CC43; CN54 75.0; 120,0 55.3;88.5 M 10;M 12 SN19 SN58 SP21 75.0;120,0 55.3;88.5 M 10;M 12
281 306 CC12; CN16 CC43; CN54 75.0; 120,0 55.3;88.5 M 10;M 12 SN20 SN59 SP22 75.0;120,0 55.3;88.5 M 10;M 12​

Tool holding

Bending stiffness and torque transmissions are the most important factors when choosing a tool holder for boring operations. First choice should always be tools with Coromant Capto coupling, which offers excellent repeatability and the best stability characteristics on the market.​​​

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