SUMIBORON Small Diameter Boring Bars BSME Type ■ Characteristics ● Achieves minimum machineable diameter of ø2.5 mm for hardened steel internal machining ● Achieves high precision cutting edge positioning through newly developed clamp mechanism ● Achieves high performance machining comparable to grinding machining with further cutting in the small hole region ● Brazed type BSME type handles machining diameters from ø2.5 mm up to ø5.0 mm ● Indexable insert type SEXC type handles machining diameters from ø4.0 mm up to ø6.0 mm SUMIBORON E BSME Fig 1 DMIN Min. machinable diameter Fig 2 DMIN Min. machinable diameter Boring Internal / Facing 10° DN 10° DN Bars WF DCON WF DCON RE CDX RE CDX LF LF ■ Tools Dimensions (mm) Grades Min. machining Diameter Neck diameter Length Cutting edge Depth of cut Nose radius diameter distance Applicable Cat. No. BN2000 DMIN DCON DN LF WF CDX RE Fig sleeves R L BSME R/L25020D2S6 D D 2.5 6.0 2.0 32.0 1.20 5.3 0.2 BSME R/L25020D3S6 D D 2.5 6.0 2.0 34.5 1.20 7.8 0.2 1 BSME R/L25020D4S6 2.5 6.0 2.0 37.0 1.20 10.3 0.2 BSME R/L30020D2S6 D D 3.0 6.0 2.5 32.8 1.45 6.3 0.2 BSME R/L30020D3S6 D D 3.0 6.0 2.5 35.8 1.45 9.3 0.2 BSME R/L30020D4S6 3.0 6.0 2.5 38.8 1.45 12.3 0.2 BSME R/L35020D2S6 D D 3.5 6.0 3.0 33.5 1.70 7.3 0.2 BSME R/L35020D3S6 D D 3.5 6.0 3.0 37.0 1.70 10.8 0.2 BSME R/L35020D4S6 3.5 6.0 3.0 40.5 1.70 14.3 0.2 HBSM6020 BSME R/L40020D2S6 D D 4.0 6.0 3.5 33.9 1.95 8.3 0.2 BSME R/L40020D3S6 D D 4.0 6.0 3.5 37.9 1.95 12.3 0.2 2 BSME R/L40020D4S6 4.0 6.0 3.5 41.9 1.95 16.3 0.2 BSME R/L45020D2S6 D D 4.5 6.0 4.0 35.0 2.20 9.3 0.2 BSME R/L45020D3S6 D D 4.5 6.0 4.0 39.5 2.20 13.8 0.2 BSME R/L45020D4S6 4.5 6.0 4.0 44.0 2.20 18.3 0.2 BSME R/L50020D2S6 D D 5.0 6.0 4.5 35.8 2.45 10.3 0.2 BSME R/L50020D3S6 D D 5.0 6.0 4.5 40.8 2.45 15.3 0.2 BSME R/L50020D4S6 5.0 6.0 4.5 45.8 2.45 20.3 0.2 BSME type requires separately sold sleeve HBSM6020. ■ Sleeves ■ Alignment Jig* ■ Newly Developed Clamp Mechanism ø20 DCB High precision cutting edge positioning is achieved through a combination of tool/holder with taper on the rear end, and a sleeve with an internal positioning pin. (Common to BSME Type / SEXC Type) LF Set screw Dimensions (mm) Tool / Holder Dia. Length Back end taper face Cat. No. Stock DCB LF Set screw Wrench Cat. No. Stock HBSM6020 D 6.0 80 BT0506 TH025 AFBSM60 D Sleeve Positioning pin Sleeve is sold separately. * This is a jig for centering the sleeve when installing the sleeve into the sleeve holder. E76