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CoroBore® BR20

Twin-edge rough boring tools for flexible boring

Handling instructions CoroBore<sup>®</sup> rough boring

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Torque

Always use a torque wrench, and apply recommended torque on screws for insert and tool assembly torque.

Clamping

Do not clamp damped Silent Tools™ straight over the adapter body.

Laser-marked scale

The laser-marked scale on the adapter facilitates setting the diameter.

View More Instructions

Set-up

Check machine spindle, run-out, wear and clamping force.

Clean assembly items

Clean all assembly items before assembly. Check inserts and insert seats regularly so they are free from dirt and not damaged.

Replace worn items

Replace worn or exhausted screws, washers and cup springs. It is recommended to replace the cup springs used when clamping the slides every 5th use to keep the pre-clamping functionality in place while setting the diameter in the pre-setter.

Lubricate once a year

Lubricate all assembly items with oil at least once a year.

Application tips

Tool setting for back boring

Tool setting for back boring

Remove the grub screw from the top cutting fluid outlet, and attach it into the lower cutting
fluid outlet in order to get the correct coolant position
Rotate cartridge 180°
Use the slide extension, if needed
Reverse rotation direction

    Interrupted cuts

    Interrupted cuts

    Machining of interrupted cuts, such as cross holes, sets 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

      Blind hole

      Blind hole

      When machining a blind hole, it is very important to ensure that proper chip evacuation takes place.
      Correct cutting data is essential to achieve proper chip formation
      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

        Weak machines

        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 the main affecting parameters.

          Recommendations

          General recommendations for 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
          • Usable length to diameter ratio (ULDR) = Boring depth LU / Boring diameter DC

          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 12.0 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 7 IP 0.9 0.7
          CC09 CC09   5513 020-09 M3.5 15 IP 3.0 2.2
          CC12 CC43   5513 020-17 M4 × 0.5 15 IP 3.0 2.2
            SP06 5513 020-33 M2.2 7 IP 0.8  0.59
          SP08 5513 020-57 M3 9 IP 1.7  1.25
          SP12 416.1-833 M3.5 10 IP 2 1.48 
          SP18 5513 020-25 M4 15 IP 3 2.2
          SN15 SN54   5512 086-03 M6 20 IP 6.4 4.7

          Maximum cutting torque and RPM

          Kit product codes Adapters Max cutting torque Max RPM
          Nm Ft/lbs
          BR20D-29CC06F/SP06Y-C4L C4-BR20D-A-189 100 74 15,000
          BR20D-36CC06F/SP06Y-C3L C3-BR20D-B-205 165 122 11,000
          BR20D-45CC09F/SP08Y-C3L C3-BR20D-C-208 290 214 9,000
          BR20D-45CC09F/SP08Y-C4L C4-BR20D-C-257 290 214 9,000
          BR20D-45CC09F/SP08Y-C6L C6-BR20D-C-284 290 214 11,000
          BR20D-56CC09F/SP08Y-C4L C4-BR20D-D-207 350 258 12,000
          BR20D-56CC09F/SP08Y-C5L C5-BR20D-D-323 350 258 7,000
          BR20D-56CC09F/SP08Y-C6L C6-BR20D-D-350 350 258 8,000
          BR20D-71CC12F/SP12Y-C5M C5-BR20D-E-282 580 428 7,000
          BR20D-71CC12F/SP12Y-C6M C6-BR20D-E-382 580 428 7,000
          BR20D-90CC12F/SP12Y-C6M C6-BR20D-F-380 780 575 5,000
          BR20D-90CC12F/SP12Y-C8M C8-BR20D-F-480 780 575 4,000
          BR20D-116CC12F/SP12Y-C8S C8-BR20D-G-388 940 693 5,000
          BR20D-116CC12F/SP12Y-C8M C8-BR20D-G-478 940 693 4,000
          BR20D-150CC12F/SP12Y-C8M C8-BR20D-H-478 1,000 738 4,000

          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. Use only one adaptive item between the Silent Tools™ adapter and the machine tool spindle.​​

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