Optimum tool for finish machining

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Geoffrey Flynn
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Series Expansion Indexable Ball-nose End Mill for Finishing Indexable Corner Radius End Mill for Finishing 2011.

1 Series Expansion Indexable Ball-nose End Mill for Finishing Indexable Corner Radius End Mill for Finishing Update B065E SRF/SRB SUF High accuracy indexable end mill Optimum tool for finish machining y y y y y y y High accuracy insert positioning and high rigidity clamping. Significant reduction in tool costs for finishing. New SUF indexable corner radius end mill for finish cutting. A new PVD coated carbide grade MP8010 added to the SRF range of indexable ball end mills for finish cutting. Excellent performance when machining hardened steel and cast iron. SRF screw-in type now available. SUF series expansion ø10, 12, 16 and 32mm. SUF series, new inserts and new PVD coated carbide grade MP8010 & MP6120.

5, R15, R16 Accurate radial tolerance Radius tolerance of ±6µm for high accuracy finish machining comparable to solid ball nose end mills.

2 Indexable Ball-nose End Mill for Finishing SRF Applications Cutting edge radii y Features S-shaped end profile The new S-shaped end profile allows for an edge sharpness similar to solid ball nose end mills. Finishing of moulds, Copying curved surfaces R5, R6, R8, R10, R12.5, R15, R16 Accurate radial tolerance Radius tolerance of ±6µm for high accuracy finish machining comparable to solid ball nose end mills Insert grades MIRACLE coated has a good balance of wear and chipping resistance. MP8010 demonstrates outstanding cutting performance when machining hardened steel and cast iron. Carbon steels Alloy steels Pre-hardened steels Hardened steels 45HRC 65HRC Cast iron 180 Wide selection 9.99mm 10.00mm 10.01mm Holders available in 3-styles to suit your application; steel, carbide and screw-in type. The screw-in type will also allow for interchanging of different tool heads. 0 MP8010 Exchangeable ycutting Performance MP8010 gave double tool life and improved surface finishes when compared to a conventional tool. MP8010 (µm) Roughness curve MP8010 equaled the performance of CBN during high speed of cutting cast iron. Small wear Large wear Tool life remaining Conventional Tool life used up <Cutting conditions> Work material : Mould steel (60HRC) Tool : SRFH20S25M Revolution : 5220min -1 Cutting speed : 80m/min mm (µm) mm 1.00 Cutting length:300m,max. height Rz: 3.2µm Roughness curve 1.00 Cutting length: 150m,Max. height Rz: 6.1µm Feed per tooth Depth of cut Pick feed Dry cutting : 0.2mm/tooth : 0.2mm : 0.2mm MP8010 Surface roughness (μm) MP8010 Competitor's CBN Competitor's CBN <Cutting conditions> Work material : DIN GG30 Tool : SRFH30S32LW Revolution : 10000min -1 Cutting speed : m/min Feed per tooth : 0.3mm/tooth Depth of cut : 0.2mm Pick feed : 0.5mm Dry cutting 1

Peripheral cutting Corner R edge tolerance Short peripheral cutting edge to reduce vibration when wall machining. R1.10 50 R1.00 60 R0.99 70 Cutting edge diameter tolerance : ±0.010mm : 0 --0.

3 Indexable Corner Radius End Mill for Finishing SUF Applications Finishing of moulds Corner R R0.5, R1, R2, R3 y Features Insert Accurate tolerance Wiper edge Wiper edge geometry provides excellent surface finishes even when the feed rate is increased. Peripheral cutting Corner R edge tolerance Short peripheral cutting edge to reduce vibration when wall machining. R R R Cutting edge diameter tolerance : ±0.010mm : mm R R R Seamless Gash The smooth twist in the edge geometry achieves an excellent balance of sharpness and cutting edge strength. Highly accurate seamless grinding of the peripheral cutting edge, corner radii and bottom finishing edge is achieved. Insert grades MIRACLE coated has a good balance of wear and chipping resistance. MP8010 demonstrates outstanding cutting performance when machining hardened steel and cast iron. Carbon steels Pre-hardened Hardened steels Alloy steels steels Cast iron 45HRC 65HRC 90 ø20 ø19.98 SUF SUFT20R10 Compatibility 90 ø20 ø19.98 Conventional ø20(r1) SUF inserts can also be used in the wide range of SRF tool bodies. MP8010 ycutting Performance Accurate and efficient face milling SUF achieves excellent surface finishes even if the feed per tooth is increased. fz=0.2mm/tooth SUF SUFT20R10 fz=0.3mm/tooth SUF SUFT20R10 fz=0.2mm/tooth Conventional ø20(r1) (µm) mm (µm) mm (µm) mm <Cutting conditions> Work material : DIN Ck55 Tool : SRFH20S25M Revolution : 3180min -1 Cutting speed : 200m/min Feed per tooth : 0.2, 0.3mm/tooth Roughness curve 1.00 Max. height Rz : 1.75μm Roughness curve 1.00 Max. height Rz : 1.63μm Roughness curve 1.00 Max. height Rz : 3.81μm Depth of cut Pick feed Dry cutting : 0.3mm : 14mm MP8010 grade achieved three times tool life compared to a conventional grade. SUF Conventional A Conventional B MP Cutting length(m) <Cutting conditions> Work material Tool Insert Revolution Cutting speed Hardened steel milling Chipping Chipping : Mould steel (59HRC) : SRFH20S20L80 : SUFT20R10 : 1270min -1 : 80m/min Feed per tooth Depth of cut Pick feed Dry cutting Normal wear Chipping Chipping : 0.2mm/tooth : 0.2mm : 5mm 2

4 Indexable Ball-nose End Mill for Finishing SRF/SRB y STEEL SHANK TYPE Fig.1 R L3 B2 Fig.2 R L3 Fig.3 Light Alloy Cast Iron Carbon Steel Alloy Steel Stainless Steel Hardened Steel R L3 B2 Right hand tool holder only. 3 Type Standard Semi-long Long Extra Long R R D1 D4 D5 L3 B2 z x SRFH10S12M a RS3008T ztky08d SRBT10 SRFT10 12S16M a RS3510T ztky10d SRBT12 SRFT12 16S20M a RS4015T xtky15t SRFT16 SRBT16 20S25M a RS5020T xtky20t 25S32M a RS6025T xtky25t 30S32M a RS8030T xtky30t SRFT30 32S32M a RS8030T xtky30t SRBT30 SRFT32 SRBT32 SRFH10S12L a RS3008T ztky08d SRBT10 SRFT10 12S16L a RS3510T ztky10d SRBT12 SRFT12 16S20L a RS4015T xtky15t 20S25L a RS5020T xtky20t 20S20L80 a RS5020T xtky20t 25S32L s RS6025T xtky25t 25S2500 a RS6025T xtky25t 30S32L s RS8030T xtky30t SRFH20S25E a RS5020T xtky20t 20S20E120 a RS5020T xtky20t 25S32E a RS6025T xtky25t 25S25E150 a RS6025T xtky25t 30S32E a RS8030T xtky30t SRFH20S25X s RS5020T xtky20t 25S32X s RS6025T xtky25t 30S32X s RS8030T xtky30t 32S32X s RS8030T xtky30t (Note) Ensure inserts are fitted in the correct way. (Refer to page 6.) Clamp Torque (N m) : RS3008T=1.5, RS3510T=2.5, RS4015T=3.3, RS5020T=5.0, RS6025T=7.5, RS8030T=10.0 a : Inventory maintained. s : Inventory maintained in Japan. Number of Teeth Type (Fig.) Clamp Screw Wrench Insert SRFT16 SRBT16 SRFT30 SRBT30 SRFT30 SRBT30 SRFT30 SRBT30 SRFT32 SRBT32

5 y CARBIDE SHANK TYPE Fig.1 R L3 Type Standard Long R R D1 D4 D5 L3 A Right hand tool holder only. z x SRFH10S10MW a RS3008T ztky08d SRBT10 SRFT10 12S12MW a RS3510T ztky10d SRBT12 SRFT12 16S16MW a RS4015T xtky15t SRBT16 SRFT16 20S20MW a RS5020T xtky20t 25S25MW a RS6025T xtky25t SRFT30 30S32MW s RS8030T xtky30t M SRBT30 SRFT32 SRBT32 SRFH10S10LW a RS3008T ztky08d SRBT10 SRFT10 12S12LW a RS3510T ztky10d SRBT12 SRFT12 16S16LW a RS4015T xtky15t SRBT16 SRFT16 16S16EW a RS4015T xtky15t SRBT16 SRFT16 20S20LW a RS5020T xtky20t 25S25LW s RS6025T xtky25t 30S32LW s RS8030T xtky30t (Note 1) SRFH30S32MW and SRFH30S32LW tool body can use both inserts SRFT30 and SRFT32. However, the overall length size is different respectively. (Note 2) Ensure inserts are fitted in the correct way. (Refer to page 6.) Clamp Torque (N m) : RS3008T=1.5, RS3510T=2.5, RS4015T=3.3, RS5020T=5.0, RS6025T=7.5, RS8030T=10.0 y SCREW-IN TYPE Number of Teeth Type (Fig.) Clamp Screw Wrench Insert SRFT30 SRBT30 SRFT32 SRBT32 Coolant Hole Number of Teeth R R D1 D4 D5 1 H1 M SRFH16AM0830 a u RS4015T TKY15T 20AM1035 a u RS5020T TKY20T 25AM1240 a u RS6025T TKY25T 30AM1645 a u RS8030T TKY30T (Note 1) SRFH30AM1645 tool body can use both inserts SRFT30 and SRFT32. However, the overall length size is different respectively. (Note 2) For screw-in type arbors, refer to page 11. Clamp Torque (N m) : RS4015T=3.3, RS5020T=5.0, RS6025T=7.5, RS8030T=10.0 R A Tool Weight 1 H1 A-A section Right hand tool holder only. (kg) Clamp Screw Wrench Insert SRFT16 SRBT16 SRFT30 SRBT30 SRFT32 SRBT32 4

6 Indexable Ball-nose End Mill for Finishing SRF/SRB INSERTS Coated Shape MP6120 MP8010 D1 R F1 S1 SRFT10 a a a a a a a a a a a a a a a a a a a a a SRBT10 a a a a a a a D D ±0.025 Geometry F1 S 1 L 1 ±0.015 S 1 L 1 ±0.015 R±0.006 R±0.006 RECOMMENDED CUTTING CONDITIONS Work Material Hardness Grade Cutting Speed vc (m/min) Feed per Tooth fz (mm/tooth) Depth of Cut ap (mm) P Carbon Steel Alloy Steel HB EP (80 300) 0.2 ( ) <0.05D1 Pre-Hardened Steel <45HRC EP (80 200) 0.2 ( ) <0.05D1 Alloy Tool Steel HB EP (80 200) 0.2 ( ) <0.05D1 K Gray Cast Iron Tensile Strength <350MPa MP ( ) 0.2 ( ) <0.05D1 Ductile Cast Iron Tensile Strength <800MPa MP (80 300) 0.2 ( ) <0.05D1 H Hardened Steel 45 55HRC MP (60 120) 0.2 ( ) <0.05D1 Hardened Steel 55 65HRC MP (60 120) 0.2 ( ) <0.01D1 (Note 1) The above values are average condition values at actual cutting speeds. The values change slightly according to the state of a machine to be used and method of workholding. Adjust the values depending on an actual machine condition, referring to the above values. (Note 2) For end mills with a carbide shank, you will be able to set about 20 percent higher cutting conditions. (Note 3) Please note the following when machining hardened steel with MP8010. Shorten tool overhang as much as possible. Use a carbide shank type. Depth of cut setting is important to prevent fracture. 5 a : Inventory maintained. (2 inserts in one case)

7 CUTTING SPEED FORMULAE 1. Employing' Calculate cutting speed at point P. (Cutting speed at the cutting depth border for oblique machining) Formula : Cutting Speed = ) D1 sin ' n (m/min) 1000 ' =cos -1 ( D1-2ap )+90 % D1 n : Spindle Speed (min -1 ) ap % 2. Employing ap Calculate cutting speed at point Q. (Cutting speed at the cutting depth border) P Formula : Cutting Speed = 2)n ap (D1-ap) (m/min) 1000 n : Spindle Speed (min -1 ) D1 : Cutting Edge Diameter (mm) ap : Depth of Cut (mm) ' Q ap FITTING INSERTS ON HOLDERS 1. Clean the insert seat Thoroughly clean the insert and seat in the holder body. 2. Fitting the insert Place the concave mark on the insert uppermost as shown with the clamp screw inserted from above (only SRF type inserts). Fasten the clamp screw while firmly pressing the insert against the insert seat wall. Use of a special anti seize lubricant MK1KS is recommended. Tighten within the recommended torque range. Concave Mark 6

8 Indexable Corner Radius End Mill for Finishing SUF y STEEL SHANK TYPE Fig.1 Fig.2 Re ap(max. Depth of Cut) L3 B2 Fig.3 Re ap(max. Depth of Cut) L3 Light Alloy Cast Iron Carbon Steel Alloy Steel Stainless Steel Hardened Steel Re ap (Max. Depth of Cut) B2 L3 Right hand tool holder only. Type Number of Teeth R D1 D4 D5 L3 B2 Type (Fig.) z x Clamp Screw Wrench Insert Standard Semi-long Long Extra Long SRFH10S12M a RS3008T ztky08d SUFT10Rpp 12S16M a RS3510T ztky10d SUFT12Rpp 16S20M a RS4015T xtky15t SUFT16Rpp 20S25M a RS5020T xtky20t SUFT20Rpp 25S32M a RS6025T xtky25t SUFT25Rpp 30S32M a RS8030T xtky30t SUFT30Rpp 32S32M a RS8030T xtky30t SUFT32Rpp SRFH10S12L a RS3008T ztky08d SUFT10Rpp 12S16L a RS3510T ztky10d SUFT12Rpp 16S20L a RS4015T xtky15t SUFT16Rpp 20S25L a RS5020T xtky20t SUFT20Rpp 20S20L80 a RS5020T xtky20t SUFT20Rpp 25S32L s RS6025T xtky25t SUFT25Rpp 25S2500 a RS6025T xtky25t SUFT25Rpp 30S32L s RS8030T xtky30t SUFT30Rpp SRFH20S25E a RS5020T xtky20t SUFT20Rpp 20S20E120 a RS5020T xtky20t SUFT20Rpp 25S32E a RS6025T xtky25t SUFT25Rpp 25S25E150 a RS6025T xtky25t SUFT25Rpp 30S32E a RS8030T xtky30t SUFT30Rpp SRFH20S25X s RS5020T xtky20t SUFT20Rpp 25S32X s RS6025T xtky25t SUFT25Rpp 30S32X s RS8030T xtky30t SUFT30Rpp 32S32X s RS8030T xtky30t SUFT32Rpp (Note) Ensure inserts are fitted in the correct way. (Refer to page 9.) Clamp Torque (N m) : RS3008T=1.5, RS3510T=2.5, RS4015T=3.3, RS5020T=5.0, RS6025T=7.5, RS8030T= a : Inventory maintained. s : Inventory maintained in Japan.

9 y CARBIDE SHANK TYPE Fig.1 A M Re ap(max. Depth of Cut) L3 Right hand tool holder only. Type Number of Teeth R D1 D4 D5 L3 Type (Fig.) z x Clamp Screw Wrench Insert Standard Long SRFH10S10MW a RS3008T ztky08d SUFT10Rpp y SCREW-IN TYPE 12S12MW a RS3510T ztky10d SUFT12Rpp 16S16MW a RS4015T xtky15t SUFT16Rpp 20S20MW a RS5020T xtky20t SUFT20Rpp 25S25MW a RS6025T xtky25t SUFT25Rpp 30S32MW s RS8030T xtky30t SUFT30Rpp SUFT32Rpp SRFH10S10LW a RS3008T ztky08d SUFT10Rpp 12S12LW a RS3510T ztky10d SUFT12Rpp 16S16LW a RS4015T xtky15t SUFT16Rpp 16S16EW a RS4015T xtky15t SUFT16Rpp 20S20LW a RS5020T xtky20t SUFT20Rpp 25S25LW s RS6025T xtky25t SUFT25Rpp 30S32LW s RS8030T xtky30t SUFT30Rpp SUFT32Rpp (Note 1) SRFH30S32MW and SRFH30S32LW tool body can use both inserts SUFT30Rpp and SUFT32Rpp. However, the overall length size is different respectively. (Note 2) Ensure inserts are fitted in the correct way. (Refer to page 9.) Clamp Torque (N m) : RS3008T=1.5, RS3510T=2.5, RS4015T=3.3, RS5020T=5.0, RS6025T=7.5, RS8030T=10.0 Re A ap (Max. Depth of Cut) 1 H1 A-A section Coolant Hole Number of Teeth R D1 D4 D5 1 H1 M Type (Fig.) Right hand tool holder only. Clamp Screw Wrench Insert SRFH16AM0830 a u RS4015T TKY15T SUFT16Rpp 20AM1035 a u RS5020T TKY20T SUFT20Rpp 25AM1240 a u RS6025T TKY25T SUFT25Rpp 30AM1645 a u RS8030T TKY30T SUFT30Rpp SUFT32Rpp (Note 1) SRFH30AM1645 tool body can use both inserts SUFT30Rpp and SUFT32Rpp. However, the overall length size is different respectively. (Note 2) For screw-in type arbors, refer to page 11. Clamp Torque (N m) : RS4015T=3.3, RS5020T=5.0, RS6025T=7.5, RS8030T=10.0 8

Indexable Corner Radius End Mill for Finishing SUF INSERTS Coated Shape MP8010 D1 Re F1 ap S1 Geometry SUFT10R05 a a 10 0.5 1 1.5 8.5 2.6 10R10 a a 10 1 1 2 8.5 2.6 10R20 a a 10 2 1 3 8.5 2.6 12R05 a a 12 0.

10 Indexable Corner Radius End Mill for Finishing SUF INSERTS Coated Shape MP8010 D1 Re F1 ap S1 Geometry SUFT10R05 a a R10 a a R20 a a R05 a a R10 a a R20 a a R30 a a R05 a a R10 a a R15 a a R20 a a R30 a a R05 a a R10 a a F1 ap ±0.015 Re± R15 a a R20 a a R30 a a R05 a a R10 a a D S1 25R20 a a R30 a a R05 a a R10 a a R20 a a R30 a a R05 a a R10 a a R20 a a FITTING INSERTS ON HOLDERS 1. Clean the insert seat Thoroughly clean the insert and seat in the holder body. 2. Fitting the insert Place the concave mark on the insert uppermost as shown with the clamp screw inserted from above (only SUF type inserts). Fasten the clamp screw while firmly pressing the insert against the insert seat wall. Use of a special anti seize lubricant MK1KS is recommended. Tighten within the recommended torque range. Concave Mark 9 a : Inventory maintained. (2 inserts in one case)

11 RECOMMENDED CUTTING CONDITIONS y SHOULDER MILLING(Small width of cut. ) Work Material Hardness Grade Cutting Speed vc (m/min) Depth of Cut ap (mm) Cutting Width ae (mm) Feed per Tooth fz (mm/tooth) P Carbon Steel Alloy Steel HB 200 (80 300) <0.05D1 <0.05D1 0.2 (<0.4) Pre-Hardened Steel <45HRC 150 (80 200) <0.05D1 <0.05D ( <0.3) Alloy Tool Steel HB 150 (80 200) <0.05D1 <0.05D ( <0.3) M Stainless Steel <270HB 150 ( ) <0.05D1 <0.05D1 0.2 (<0.4) K Gray Cast Iron Tensile Strength <350MPa MP ( ) <0.05D1 <0.05D1 0.3 (<0.4) Ductile Cast Iron Tensile Strength <350MPa MP (80 300) <0.05D1 <0.1D1 0.3 (<0.4) H Hardened Steel 45 55HRC MP (80 120) <0.05D1 <0.02D1 0.1 (<0.2) Hardened Steel 55 65HRC MP (60 100) <0.05D1 <0.02D1 0.1 (<0.2) When the pick feed direction is along the axis of the tool such as finish machining at the wall part. y SLOTTING SHOULDER MILLING (Large width of cut. ) Work Material Hardness Grade Cutting Speed vc (m/min) Depth of Cut ap (mm) Cutting Width ae (mm) Feed per Tooth fz (mm/tooth) P Carbon Steel Alloy Steel HB 200 (80 300) <0.02D1 <D1 0.2 (<0.4) Pre-Hardened Steel <45HRC 150 (80 200) <0.02D1 <D ( <0.3) Alloy Tool Steel HB 150 (80 200) <0.02D1 <D ( <0.3) M Stainless Steel <270HB 150 ( ) <0.02D1 <D1 0.2 (<0.4) K Gray Cast Iron Tensile Strength <350MPa MP ( ) <0.03D1 <D1 0.3 (<0.4) Ductile Cast Iron Tensile Strength <350MPa MP (80 300) <0.03D1 <D1 0.3 (<0.4) H Hardened Steel 45 55HRC MP (80 120) <0.01D1 <D1 0.1 (<0.2) Hardened Steel 55 65HRC MP (60 80) <0.01D1 <D1 0.1 (<0.2) When the feed is in the radial axis of the tool. E.g. machining a side wall. (Note 1) Cutting conditions are for a standard steel shank type. If vibration or chipping of the insert occurs, reduce the cutting conditions appropriately. (Note 2) Cutting speed is calculated at the peripheral edge of the tool. Calculate spindle speed in the following way. Spindle speed n(min -1 )=1000 Cutting speed vc udiameter of cutting tool D1u3.14 (Note 3) Please note the following when machining hardened steel with MP8010. Shorten tool overhang as much as possible. Use a carbide shank type. Depth of cut setting is important to prevent fracture. 10

12 Indexable Ball-nose End Mill for Finishing Indexable Corner Radius End Mill for Finishing ARBORS y STRAIGHT SHANK ARBOR Type D9 D4 D5 H1 M SC16M08S100S s M8 STEEL SHANK TYPE 08S200L s M8 SC20M10S120S s M10 10S220L s M10 SC25M12S125S s M12 12S245L s M12 SC32M16S140S s M16 16S280L s M16 M SC16M08S100SW s M8 ød9 H1 CARBIDE SHANK TYPE 08S200LW s M8 SC20M10S120SW s M10 10S220LW s M10 SC25M12S125SW s M12 12S245LW s M12 SC32M16S140SW s M16 16S280LW s M16 HOW TO INSTALL THE SCREW-IN HEAD z Thoroughly clean the clamp section of the head and the arbor with an air blower or brush before installation. x Tighten the head at the recommended torque and ensure that there is no gap between the head and arbor. Screw Size Recommended Torque (N m) Wrench Size (mm) M M M M Cutting tools become extremely hot during cutting. Never touch them with bare hands after operation as this may produce risk of injuries or burns. Do not handle the cutting tools with bare hands as this may cause injuries. 11 s : Inventory maintained in Japan.

13 y BT30 SHANK ARBOR M BT30 D9 D5 0 M SC16M08S10-BT30 s M8 ød9 20M10S10-BT30 s M10 25M12S10-BT30 s M12 32M16S10-BT30 s M16 0 y BT40 SHANK ARBOR M BT40 D9 D5 0 M SC16M08S10-BT40 s M8 ød9 20M10S10-BT40 s M10 25M12S10-BT40 s M12 32M16S10-BT40 s M16 0 y HSK63A SHANK ARBOR M HSK63A D9 D5 0 M SC16M08S22-HSK63A s M8 ød9 C4 ø63 20M10S24-HSK63A s M10 25M12S27-HSK63A s M12 32M16S28-HSK63A s M

14 Indexable Ball-nose End Mill for Finishing Indexable Corner Radius End Mill for Finishing SRF/SUF APPLICATION EXAMPLES Tool Insert SRFH20S25M SRFH20S25M SRFH30S32LW SRFH20S20LW SRFT30 SUFT20R10 Grade MP8010 MP8010 Machine Bridge-column machining centre Vertical type M/C Bridge-column machining centre Vertical type M/C Mould steel Mould steel Cast iron Alloy steel (33HRC) (60HRC) (35HRC) Work Material Cutting Conditions Component Mould for forming resin Press mould Press mould Mould for forming resin Actual Cutting Speed (m/min) Table Feed (mm/min) Feed per Tooth (mm/tooth) Depth of Cut (mm) Width of Cut (mm) Coolant Water soluble Air blow Air blow Air blow Results Low cutting noise and good surface finish. Higher efficiency machining is achieved and the cutting time can be decreased compared with conventional PVD coated carbide. Using cutting conditions of conventional CBN, an increased cutting length of 10000m is achievable. The surface finish on the bottom face is improved compared to a competitors grade. also achieved double tool life. 13

15 Memo 14

16 SRF/SUF Indexable Ball-nose End Mill for Indexable Corner Radius End Mill Finishing for Finishing SRF/SUF IDD(1) Printed in Germany

Optimum tool for finish machining

Optimum tool for finish machining Serie Expanion Indexable Ball-noe & Corner Radiu End Mill for Finihing SRF 2.6 Update B65A High accuracy indexable end mill Optimum tool for finih machining y High accuracy like Solid Carbide End Mill.