Общий каталог Yamawa 2022 - 2023 - страница 1239

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Center DrillsCenter Drills Table of recommend centering conditionTable of recommend centering condition

Center Drills are the tool for making center hole. Center Drills are also used for positioning before drilling, and for chamfering of the hole.Center Drills are the tool for making center hole. Center Drills are also used for positioning before drilling, and for chamfering of the hole. ■■Table of recommend centering condition.Table of recommend centering condition.

HSS (PE-Q PE-90˚)HSS (PE-Q PE-90˚)

Work materialSoft structural steelsCarbon steelsAlloy steelsStainless steelsAluminum alloy casting
Cutting speed
Diameter Revolution Speed Feed per revolution Revolution Speed Feed per revolutionRevolution Speed Feed per revolutionRevolution Speed Feed per revolution Revolution Speed Feed per revolution

(Ds) (Ds) Drill length (ℓ)Drill length (ℓ) Overall length (L)Overall length (L)

■■Shape of center hole and centerShape of center hole and center

Type A (60°) Center hole & 60°center Type B (60°) Center hole & 60°center Type A (90°) Center hole & 90°centerType A (60°) Center hole & 60°center Type B (60°) Center hole & 60°center Type A (90°) Center hole & 90°center Type R Center hole & 60°centerType R Center hole & 60°center

HSS+TiCN (PE-Q-V PE-90˚)HSS+TiCN (PE-Q-V PE-90˚)

Work materialSoft structural steelsCarbon steelsAlloy steelsThermal refined steelsStainless steelsAluminum alloy casting
Cutting speed
DiameterRevolution Speed Feed per revolutionRevolution Speed Feed per revolutionRevolution Speed Feed per revolutionRevolution Speed Feed per revolutionRevolution Speed Feed per revolutionRevolution Speed Feed per revolution

■■Advantage of Type B Center holesAdvantage of Type B Center holes

Avoid scar or distortion resulting from a blowAvoid scar or distortion resulting from a blow

Note : Advantage of Type B center holes : B type center drill protect the 60Note : Advantage of Type B center holes : B type center drill protect the 60°° conical bearing surface from scar or distortion resulting from a blow, roughness of workpiece surface or conical bearing surface from scar or distortion resulting from a blow, roughness of workpiece surface or burrs around the hole.burrs around the hole. Carbide+TiAIN (C-PE-Q-V PE-90˚)Carbide+TiAIN (C-PE-Q-V PE-90˚)

Work materialSoft structural steelsCarbon steelsAlloy steelsThermal refined steelsStainless steelsAluminum alloy casting
Cutting speed
Diameter Revolution Speed Feed per revolution Revolution Speed Feed per revolutionRevolution Speed Feed per revolution Revolution Speed Feed per revolution Revolution Speed Feed per revolution Revolution Speed Feed per revolution

Angle of center hole is higher thanAngle of center hole is higher than Angle of center hole is lower thanAngle of center hole is lower than Center hole and center are misaligned.Center hole and center are misaligned.

AA type type

RR type type

Note : R type center hole stably holds the center. It also some of advantage of B type center hole.Note : R type center hole stably holds the center. It also some of advantage of B type center hole.

1. Above condition done by Water Soluble oil.1. Above condition done by Water Soluble oil. 2. 20% lower feed is recommended when centering process to inclined plane.2. 20% lower feed is recommended when centering process to inclined plane. 3. 20% lower feed is recommended in the case of long shank point drills.3. 20% lower feed is recommended in the case of long shank point drills.

Technical Inf