GStype/HGStype/WGStype

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1 Tooing News No.E473 Achieving Stabe And Long Too Life With Exceent Chip Evacuation Super MutiDri GStype/HGStype/WGStype series series New J fute Design Achieves Exceent Chip Contro And Stabe Driing Utiizing DEX Coat ensures stabe and ong too ife Appicabe to a wide variety of work materias H, with its doube-margin design, improves stabiity and hoe accuracy in deep hoe driing appications W, with its specia cutting edge design, achieves stabe hoe accuracy and minimizes work hardening from driing Thin Pate Driing series

Super MutiDri GStype / HGStype Soid Carbide Super MutiDri and H utiize a new "J fute" design that has a wide chip pocket to achieve exceent chip contro and evacuation.

Exceent Versatiity Appicabe to Soft Stee, Genera Stee, Stainess Stee, Grey Cast Iron and Ductie Cast Iron n Series Range Appearance (Cooant Suppy) Cataogue No.

2 Super MutiDri GStype / HGStype Soid Carbide Super MutiDri and H utiize a new "J fute" design that has a wide chip pocket to achieve exceent chip contro and evacuation. In addition, "DEX Coat" is aso utiized to achieve stabe and onger too ife for a variety of work materias, covering a wide appication range. Exceent Versatiity Appicabe to Soft Stee, Genera Stee, Stainess Stee, Grey Cast Iron and Ductie Cast Iron n Series Range Appearance (Cooant Suppy) Cataogue No. Dri Diameter (mm) Hoe Depth (L/D) Appearance (Cooant Suppy) Cataogue No. Dri Diameter (mm) Hoe Depth (L/D) MDW GS2 ø1.0 ~ ø20.0 ~ 2 MDW HGS3 ø1.5 ~ ø20.0 ~ 3 (Externa) MDW GS4 ø1.0 ~ ø20.0 ~ 4 H (Interna) MDW HGS5 ø1.5 ~ ø20.0 ~ 5 MDW HGS8 ø1.5 ~ ø16.0 ~ 8 1 New J fute Design Unique wide and smooth fute design significanty improves chip contro and evacuation Stabe driing with minima runout even on sma machine appications n Chip Contro Conventiona Dri "J fute" is a registered trademark. 1 Wide chip pocket smoothy evacuate chips generated at the center portion of the dri HGS Compact Chips Work materia : S50C (200HB) Dri used : MDW0800GS4 Cutting Conditions : V c =80m/min, f=0.25mm/rev, H=24mm Externa Cooant Suppy (Water Soube) GS n Cutting Resistance Comparison The exhibits stabe driing behaviour throughout Minimize enargement at the bottom of the hoe to improve accuracy Cutting Force 1,800 1,400 1, Hoe Entrance Hoe Exit Thrust (N) Torque (N.m) Conventiona Dri Hoe Entrance Increase near the bottom of the hoe Hoe Exit Hoe Diameter (mm) Entrance Bottom of Hoe Tota Driing Length (m) Cutting Force Hoe Entrance Hoe Exit XY Force (N) Hoe Entrance Hoe Exit Work Materia : S50C (200HB) Dri Used : MDW0800GS4 Cutting Conditions : V c =80m/min, f=0.25mm/rev, H=24mm Externa Cooant Suppy (Water Soube) Large Vibration Ampitude Hoe Diameter (mm) Conventiona Dri Hoes tend to become arger near the bottom Entrance Bottom of Hoe Tota Driing Length (m) 2

39μm Ra1.72μm 0.5 0 H Comp A Surface Roughness (Ra) Comp B Work : SCM415 (120HB) Dri Used : MDW0800HGS5 Conditions : V c =80m/min, f=0.

3 2 H utiizes a doube-margin design 3 Utiizing a word's first compound super muti-ayered "DEX Coat" 2 Doube-Margin Design (H) Excude dri sizes ø1.5 ~ ø2.4mm H, with its doube-margin design, improves stabiity and hoe accuracy in deep hoe driing appications Surface Roughness Comparison H Ra0.56μm (μm) Comp A Comp B Ra1.39μm Ra1.72μm H Comp A Surface Roughness (Ra) Comp B Work : SCM415 (120HB) Dri Used : MDW0800HGS5 Conditions : V c =80m/min, f=0.25mm/rev, H=38mm, Interna Cooant Suppy (Water Soube Type) Circuarity Comparison H (Doube Margin) (Singe Margin) H Output (No. of hoes) 3 Specia Coating for Dris DEX Coat Work : S50C (200HB) Dri Used : MDW0610GS4 Conditions : V c =80m/min, f=0.25mm/rev H=64mm, Interna Cooant Suppy (Water Soube Type) Next generation coating that utiizes an unique nano-coating technoogy to provide more than doube the too ife of conventiona coatings 4-point guide design achieves stabe driing without unduations. Surface roughness and circuarity are aso good. Word's First! Compound super muti-ayered coating Significant improvements in wear, therma and adhesion resistance by adding Siicon and Chrome New super muti-ayered structure offers significant improvements in chipping resistance (coating strength) n Coating Layer SEM Image n Appication Exampes of "DEX Coat" Word's first compound super muti-ayered coating that is made from aternate ayers of super muti-ayered coatings TiACr based Super Muti-ayered Coating TiSi based Super Muti-ayered Coating Resistance Comparison Improved wear resistance at the shouder and rake face resuts in onger too ife Cutting Edge Damage Comparison After Driing 70m n Coating Properties Coating Hardness (GPa) TiSiN DEX Coat 30 TiAN TiCN TiN 20 Poor Chipping Resistance Good Adhesion Resistance Comparison Significant improvements in preventing fractures caused by work adhesion to the shouder and fute portions when driing Soft Stee. Cutting Edge Damage Comparison After Driing 70m H Competitor's Competitor's Driing Length (m) Dri Used : MDW0800GS4 Work : S50C (200HB) Cutting Conditions : V c =70m/min, f=0.25mm/rev, H=32mm Externa Cooant Suppy (Water Soube) H Breakage Abe to Continue Driing Length (m) Dri Used : MDW0800HGS5 Work : SCM415 (120HB) Cutting Conditions : V c =80m/min, f=0.25mm/rev, H=38mm Interna Cooant Suppy (Water Soube) 3

4 Super MutiDri Externa Cooant Suppy Recommended Cutting Conditions P12 Carbon Stee Heattreated Aoy Stee Hardened Stee Stainess Heat- ~0.28% 0.29%~ Stee Stee Ti - Aoy Resistant Cast Iron Cast Ductie Iron Auminum Aoy ~45HRC 46HRC~ Stee Composite Copper Materia Aoy CFRP Coat 2D 4D Singe Margin 135 ø c h8 ø s h6 Dri Diameter ø1.0 ~ ø6.5mm Dri Diameter ø6.6 ~ ø12.0mm Dri Shank 2D type 4D type Dri Shank Diameter Diameter Diameter Diameter 2D type 4D type Cataogue No. Stock Dimensions (mm) Stock Dimensions (mm) Cataogue No. Stock Dimensions (mm) Stock Dimensions (mm) 2, 4 2 L 4 L 2, 4 2 L 4 L 1.0 MDW 0100GS 6.6 MDW 0660GS GS GS GS GS GS GS GS GS GS 7.1 MDW 0710GS 1.6 MDW 0160GS GS GS GS GS GS GS GS GS MDW 0760GS MDW 0210GS GS GS GS GS GS GS GS GS 8.1 MDW 0810GS 2.6 MDW 0260GS GS GS GS GS GS GS GS GS 8.6 MDW 0860GS MDW 0310GS GS GS GS GS GS GS GS GS 9.1 MDW 0910GS MDW 0360GS GS GS GS GS GS GS GS GS 9.6 MDW 0960GS MDW 0410GS GS GS GS GS GS GS 1000GS GS 10.1 MDW 1010GS MDW 0460GS GS GS GS GS GS GS GS GS 10.6 MDW 1060GS MDW 0510GS GS GS GS GS GS GS GS GS 11.1 MDW 1110GS MDW 0560GS GS GS GS GS GS GS GS GS 11.6 MDW 1160GS MDW 0610GS GS GS GS GS GS GS GS GS Grade: ACX70 When pacing an order, pease indicate 2 or 4 in the as your required dri ength. (Exampe: MDW0200GS2) mark : Standard stocked item 4

5 Externa Cooant Suppy Recommended Cutting Conditions P12 Carbon Stee Heattreated Aoy Stee Hardened Stee Stainess Heat- ~0.28% 0.29%~ Stee Stee Ti - Aoy Resistant Cast Iron Cast Ductie Iron Auminum Aoy ~45HRC 46HRC~ Stee Composite Copper Materia Aoy CFRP Coat 2D 4D Singe Margin Dri Diameter ø12.1 ~ ø16.0mm Dri Shank Diameter Diameter 2D type 4D type Cataogue No. Stock Dimensions (mm) Stock Dimensions (mm) Cataogue No. Stock Dimensions (mm) Stock Dimensions (mm) 2, 4 2 L 4 L 2, 4 2 L 4 L 12.1 MDW 1210GS 16.1 MDW 1610GS GS GS GS GS GS GS GS GS MDW 1260GS 16.6 MDW 1660GS GS GS GS GS GS GS GS GS 13.1 MDW 1310GS 17.1 MDW 1710GS GS GS GS GS GS GS GS GS MDW 1360GS 17.6 MDW 1760GS GS GS GS GS GS GS GS GS MDW 1410GS 18.1 MDW 1810GS GS GS GS GS GS GS GS GS MDW 1460GS 18.6 MDW 1860GS GS GS GS GS GS GS GS GS MDW 1510GS 19.1 MDW 1910GS GS GS GS GS MDW 1560GS GS GS GS GS Dri Diameter ø16.1 ~ ø20.0mm Dri Diameter Shank Diameter 2D type GS GS GS GS MDW 1960GS GS GS GS GS 4D type Grade: ACX70 When pacing an order, pease indicate 2 or 4 in the as your required dri ength. (Exampe: MDW1210GS4) mark : Standard stocked item Bank : Made to order 5

6 Super MutiDri H Interna Cooant Suppy Recommended Cutting Conditions P12 Carbon Stee Heattreated Aoy Stee Hardened Stee Stainess Heat- ~0.28% 0.29%~ Stee Stee Ti - Aoy Resistant Cast Iron Cast Ductie Iron Auminum Aoy ~45HRC 46HRC~ Stee Composite Copper Materia Aoy CFRP 3D 5D 8D With Oi Hoe HGS Dri Diameter ø1.5~ø2.4mm Singe Margin HGS Dri Diameter ø2.5~ø20.0mm Doube Margin Coat 135 ø c h8 ø s h6 135 ø c h8 ø s h6 Dri Diameter ø1.5 ~ ø7.0mm Dri Shank Diameter Diameter 3D type 5D type 8D type Dri Diameter ø7.1 ~ ø12.0mm Cataogue No. Stock Dimensions Stock Dimensions Stock Dimensions Cataogue No. Stock Dimensions Stock Dimensions Stock Dimensions 3, 5, 8 3 L 5 L 8 L 3, 5, 8 3 L 5 L 8 L 1.5 MDW 0150HGS MDW 0710HGS 1.6 MDW 0160HGS HGS HGS HGS HGS HGS HGS HGS HGS 7.6 MDW 0760HGS 2.1 MDW 0210HGS HGS HGS HGS HGS HGS HGS HGS HGS 8.1 MDW 0810HGS MDW 0260HGS HGS HGS HGS HGS HGS HGS HGS HGS 8.6 MDW 0860HGS 3.1 MDW 0310HGS HGS HGS HGS HGS HGS HGS HGS HGS 9.1 MDW 0910HGS MDW 0360HGS HGS HGS HGS HGS HGS HGS HGS HGS 9.6 MDW 0960HGS 4.1 MDW 0410HGS HGS HGS HGS HGS HGS HGS 1000HGS HGS 10.1 MDW 1010HGS MDW 0460HGS HGS HGS HGS HGS HGS HGS HGS HGS 10.6 MDW 1060HGS MDW 0510HGS HGS HGS HGS HGS HGS HGS HGS HGS 11.1 MDW 1110HGS MDW 0560HGS HGS HGS HGS HGS HGS HGS HGS HGS 11.6 MDW 1160HGS 6.1 MDW 0610HGS HGS HGS HGS HGS HGS HGS HGS HGS Grade: ACX MDW 0660HGS When pacing an order, pease indicate 3, 5 or 8 in the HGS as your required dri ength. (Exampe: MDW0150HGS3) HGS HGS mark : Standard stocked item HGS Note : Sma size dris (ø1.5 ~ 2.4mm) are ony avaiabe in singe margin specification. Dri Diameter Shank Diameter 3D type 5D type 8D type 6

7 Interna Cooant Suppy Recommended Cutting Conditions P12 Carbon Stee Heattreated Aoy Stee Hardened Stee Stainess Heat- ~0.28% 0.29%~ Stee Stee Ti - Aoy Resistant Cast Iron Cast Ductie Iron Auminum Aoy ~45HRC 46HRC~ Stee Copper Composite Aoy Materia CFRP 3D 5D 8D With Oi Hoe HGS Dri Diameter ø1.5~ø2.4mm Singe Margin HGS Dri Diameter ø2.5~ø20.0mmr Doube Margin Coat Dri Diameter ø12.1 ~ ø16.0mm Dri Shank Diameter Diameter 3D type 5D type 8D type Dri Diameter ø16.1 ~ ø20.0mm Cataogue No. Stock Dimensions Stock Dimensions Stock Dimensions Cataogue No. Stock Dimensions Stock Dimensions Stock Dimensions 3, 5, 8 3 L 5 L 8 L 3, 5, 8 3 L 5 L 8 L 12.1 MDW 1210HGS 16.1 MDW 1610HGS HGS HGS HGS HGS HGS HGS HGS HGS MDW 1260HGS 16.6 MDW 1660HGS HGS HGS HGS HGS HGS HGS HGS HGS 13.1 MDW 1310HGS 17.1 MDW 1710HGS HGS HGS HGS HGS HGS HGS HGS HGS MDW 1360HGS 17.6 MDW 1760HGS HGS HGS HGS HGS HGS HGS HGS HGS 14.1 MDW 1410HGS 18.1 MDW 1810HGS HGS HGS HGS HGS HGS HGS HGS HGS MDW 1460HGS 18.6 MDW 1860HGS HGS HGS HGS HGS HGS HGS HGS HGS 15.1 MDW 1510HGS 19.1 MDW 1910HGS HGS HGS HGS HGS HGS HGS HGS HGS MDW 1560HGS 19.6 MDW 1960HGS HGS HGS HGS HGS HGS HGS HGS HGS Dri Diameter Shank Diameter mark : Standard stocked item 3D type 5D type 8D type When pacing an order, pease indicate 3, 5 or 8 in the as your required dri ength. (Exampe: MDW1210HGS5) Grade: ACX70 Bank : Made to order 7

Super MutiDri W Super MutiDri W with an optimized "J fute" design, improves chip breaking capabiities when driing thin pates and with exceent sharpness, this dri can minimize work hardening during

Dri Diameter (mm) Hoe Depth (L/D) MDW WGS2 ø6.8 ~ ø16.0 ~ 2 W (Externa) Target Appication 1.5D and beow Driing of thin pates (Thickness: 1.

8 Super MutiDri W Super MutiDri W with an optimized "J fute" design, improves chip breaking capabiities when driing thin pates and with exceent sharpness, this dri can minimize work hardening during driing. In addition, it utiizes a specia doube-margin design to achieve stabe hoe diameter accuracy. n Series Range Appearance (Cooant Suppy) Cataogue No. Dri Diameter (mm) Hoe Depth (L/D) MDW WGS2 ø6.8 ~ ø16.0 ~ 2 W (Externa) Target Appication 1.5D and beow Driing of thin pates (Thickness: 1.5D and beow) < Typica Automotive Components > Bot hoes for automotive components such as: Bearing Hub (Inner ring, Outer ring) Knucke Differentia Ring Fange Characteristics Super MutiDri W utiizes a specia J fute design for thin pate driing. It aso uses a specia doube-margin design to achieve stabe hoe diameter accuracy. Specia Doube-Margin Design Specia Cutting Edge Design Optimized Fute Design Performance Minimizing work hardening of dried hoe wa Too ife Conventiona Criteria Line Dri Surface Hardness of Inner Wa (Hv) pcs W 1,000pcs ,000 Output (pcs) Work Materia : S53C Dri Used : MDW1390WGS2 Conditions : Vc=70m/min, f=0.2mm/rev, H=13mm Stabiity of dried hoe size 0.05 Hoe Oversize (mm) ,000 1,100 Shortening of chips Entry Intermediate Exit Conventiona Dri (Singe Margin) W (Doube Margin) Conventiona Dri W Work Materia : S50C Work Materia : SUJ2 Dri Used : MDW1080WGS2 Dri Used : MDW1150WGS2 Conditions : Vc=80m/min, f=0.25mm/rev, H=16mm Conditions : Vc=80m/min, f=0.25mm/rev, H=13mm 8

9 Super MutiDri W Externa Cooant Suppy Recommended Cutting Conditions P12 Carbon Stee Heattreated Aoy Stee Hardened Stee Stainess Heat- ~0.28% 0.29%~ Stee Stee Ti - Aoy Resistant Cast Iron Cast Ductie Iron Auminum Aoy ~45HRC 46HRC~ Stee Composite Copper Materia Aoy CFRP Coat 2D Doube Margin 135 ø c (h8) ø s h6 Dri Diameter ø6.8 ~ ø16.0mm Dri Diameter ød c (mm) Shank Diameter ød s (mm) Cataogue No. 2D type Dimensions (mm) 6.8~ MDW 0680~0700WGS ~ 7.5 MDW 0710~0750WGS ~ ~0800WGS ~ 8.5 MDW 0810~0850WGS ~ ~0900WGS ~ 9.5 MDW 0910~0950WGS ~ 0960~1000WGS ~10.5 MDW 1010~1050WGS ~ ~1100WGS ~ 11.5 MDW 1110~1150WGS ~ ~1200WGS ~12.5 MDW 1210~1250WGS ~ ~1300WGS ~13.5 MDW 1310~1350WGS ~ ~1400WGS ~14.5 MDW 1410~1450WGS ~ ~1500WGS ~15.5 MDW 1510~1550WGS ~ ~1600WGS2 55 Q The dris in this series are made to order. Pease specify the hoe diameter (incuding toerances) when pacing an order. L Grade: ACX70 9

10 n Appication Exampes (Super MutiDri ) S43C (250HB) Automotive Component Boron Stee (250HRC) Machine Component SS400 Machine Component Dri Used : MDW0970GS4 Conditions : Vc=80m/min, f=0.25mm/rev H=25mm, Externa Cooant Suppy (Water Soube Type) Achieving 1.5 times onger too ife! Reduced wear at periphera cutting edges! Dri Used : MDW0980GS2 Conditions : Vc=70m/min, f=0.15mm/rev H=7mm, Externa Cooant Suppy (Water Soube Type) 1.3x too ife of conventiona toos! Good circuarity and cyindricity! Dri Used : MDW1050GS4 Conditions : Vc=150m/min, f=0.3mm/rev H=12mm, Externa Cooant Suppy (Water Soube Type) Achieving 1.5 times onger too ife! Good chip contro! 1,400 hoes 2,600 hoes 1,800 hoes 900 hoes Fracture Conventiona Dri 2,000 hoes ,000 1,500 (Output) 0 1,000 2,000 3,000 (Output) 0 1,000 2,000 (Output) 1,200 hoes Adhesion SUS310S Machine Component SCM435 Machine Component S45C Machine Component Dri Used : MDW0330GS4 Conditions : Vc=25m/min, f=0.06mm/rev H=10mm, Externa Cooant Suppy (Oi Based Type) Achieving 2.6 times onger too ife! Dri Used : MDW0610GS4 Conditions : Vc=61m/min, f=0.15mm/rev H=25mm, Externa Cooant Suppy (Water Soube Type) Achieving 2.3 times onger too ife! Dri Used : MDW1040GS4 Conditions : Vc=80m/min, f=0.2mm/rev () Vc=40m/min, f=0.25mm/rev (Conv. dri) H=31mm, Externa Cooant Suppy (Water Soube Type) Achieving 1.6 times higher efficiency and 1.8 times onger too ife! 1,200 hoes 7,100 hoes 3,000 hoes 450 hoes Breakage 3,000 hoes Breakage Conventiona 1,500 hoes Breakage Dri ,000 (Output) 0 3,000 6,000 (Output) 0 1,500 3,000 (Output) 10

11 n Appication Exampes (Super MutiDri H) SCR440H Automotive Component SUJ2 Automotive Component SCM415 Machine Component Dri Used : MDW0600HGS8 Conditions : Vc=80m/min, f=0.25mm/rev H=28mm, Interna Cooant Suppy (Oi Based Type) Achieving 1.3 times onger too ife! Dri Used : MDW0570HGS5 Conditions : Vc=80m/min, f=0.1mm/rev H=35mm, Interna Cooant Suppy (Water Soube Type) Achieving 2.5 times onger too ife! Dri Used : MDW0860HGS3 Conditions : Vc=52m/min, f=0.2mm/rev H=25mm, Interna Cooant Suppy (Water Soube Type) Achieving 1.8 times onger too ife! H 650 hoes H 1,500 hoes H 1,500 hoes 500 hoes Breakage 600 hoes 800 hoes ,000 (Output) ,000 1,500 (Output) ,000 1,500 (Output) n Appication Exampes (Super MutiDri W) Dri Used : MDW1110WGS2 Conditions : Vc=70m/min, f=0.3mm/rev, H=6mm Externa Cooant Suppy (Water Soube) Work Materia : SUJ2 WGS Achieving 1.5 times onger too ife! W 1,500 hoes Comp A Comp A 1,000 hoes Breakage ,000 1,500 (Output) Dri Used : MDW1370WGS2 Conditions : Vc=90m/min, f=0.3mm/rev, H=10mm Externa Cooant Suppy (Water Soube) Work Materia : S53C Achieving 1.5 times onger too ife with reduced wear at center of dri WGS W 9,000 hoes 6,000 hoes 0 3,000 6,000 9,000 (Output) 11

12 n Recommended Cutting Conditions (Super MutiDri ) [ Vc : Cutting Speed (m/min), f : Feedrate (mm/rev) ] Dri Diameter Cutting Soft Stee / Genera Stee Hardened Stee Stainess Stee Grey Cast Iron Ductie Cast Iron ød c (mm) Condition (~300HB) (~45HRC) (~60HRC) (~200HB) FC250 FCD450 ~ø3.0 V c f ~ø4.0 V c f ~ø5.0 V c f ~ø8.0 V c f ~ø V c f ~ø12.0 V c f ~ø16.0 V c f ~ø20.0 V c f Min. - Optimum - Max. n Recommended Cutting Conditions (Super MutiDri H) [ Vc : Cutting Speed (m/min), f : Feedrate (mm/rev) ] Dri Diameter Cutting Soft Stee / Genera Stee Hardened Stee Stainess Stee Grey Cast Iron Ductie Cast Iron Ti Aoy Incone ød c (mm) Condition (~300HB) (~45HRC) (~60HRC) (~200HB) FC250 FCD450 6A-4V-Ti 718 ~ø3.0 V c f ~ø4.0 V c f ~ø5.0 V c f ~ø8.0 V c f ~ø V c f ~ø12.0 V c f ~ø16.0 V c f ~ø20.0 V c f Min. - Optimum - Max. n Recommended Cutting Conditions (Super MutiDri W) Dri Diameter ød c (mm) ~ø ~ø16.0 Cutting Condition Soft Stee / Genera Stee (~200HB) Stainess Stee (~200HB) Grey Cast Iron FC250 [ Vc : Cutting Speed (m/min), f : Feedrate (mm/rev) ] Ductie Cast Iron FCD450 V c f V c f Min. - Optimum - Max. [ The recommended cutting conditions depend on actua machine rigidity, work camping and other factors. Pease adjust the conditions accordingy. [ If work hardening occurs during driing, pease operate using the ower ranges of the recommended cutting conditions.! SAFETY NOTES Very hot or engthy chips may be discharged whie the Pease hande with care as this product has sharp edges. machine is in operation. Therefore, machine guards, Improper cutting conditions or mis-handing of the too may safety gogges or other protective covers must be used. resut in breakages or projecties. Therefore, pease use the Fire safety precautions must aso be considered. too within its recommended conditions. When using non-water soube cutting oi, precautions against fire must be taken and pease ensure that a fire extinguisher is paced near the machine. Goba Marketing Department : 1-1 Koyakita 1-Chome, Itami, Hyogo Japan Te : (+81) Fax : (+81) SHAP16-01JV13

SMD type. SEC-MultiDrills. The Ultimate in Low Cost Drilling

SMD type. SEC-MultiDrills. The Ultimate in Low Cost Drilling Tooling News No.E435 The Ultimate in Low Cost ing SEC-s MB Utilizing DEX Coat, a dedicated coating developed for drills, to achieve more than double the tool life of conventional drills Head Different