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CoroBore® BR20

Twin-edge rough boring tools for flexible boring

Application tips

Tool setting for back boring

• Remove grub screw from top cutting fluid outlet and attach it into lower cutting

• Fluid outlet in order to get correct coolant position

• Rotate cartridge 180°

• Use slide extension if needed

• Reverse rotation direction

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

• Ensure/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

Weak machines

When roughing, make sure the machine has the required power and torque needed for the specific boring application. Feed, number of inserts, hole diameter and depth of cut are main affecting parameters.

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.

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® BR20/CoroBore® BR20 with Silent Tools™ technology

  Insert 90° Insert 84°
Size DCN (mm) DCX (mm) ISO ANSI Nm Ft/lbs Screw size Non-ISO Nm Ft/lbs Screw size
A 23 29 CC06 CC2(1.5) 4.8 3.5 M4 SP06 4.8 3.5 M4
B 28 36 CC06 CC2(1.5) 4.8 3.5 M4 SP06 4.8 3.5 M4
C 35 45 CC09 CC3(2.5) 9 6,6 M5 SP08 9 6,6 M5
D 44 56 CC09 CC3(2.5) 16.0 11.8 M6 SP08 16.0 11.8 M6
E 55 71 CC12 CC43 38.0 28.0 M8 SP12 38.0 28.0 M8
F 70 90 CC12 CC43 75 55 M10 SP12 75 55 M10
G 89 116 CC12 CC43 75 55 M10 SP12 75 55 M10
H 115 150 CC12 CC43 75 55 M10 SP12 75 55 M10

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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