Current site:
Current language:
Unit of measurement:
Please select your country!

{{group.Text}}

{{"ifind_go-back" | translate}}

{{group.Text}}

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

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.​​

Sign up for our newsletter today:

 

  Sign up!
We use cookies to enhance the experience on our website. More about cookies.