Общий каталог Yamawa 2022 - 2023 - страница 952

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Dia. Shank Overall Flute

JIS NC-SD V NC-SD

NC Starting Drills for Chamfering (90°), Coated NC Starting Drills for Center Positioning (125°)

Specification Specification

Coating

Product FeaturesProduct Features
After drilling with a general purpose drill, using a NC - SD V (90°)The NC starting drill with a 125°drill point is a positioning drill
that is larger than the drilled hole diameter makes an excellentdedicated to centering to increase hole positioning accuracy.
chamfer surface finish.The NC starting drill with a 125°drill is selected to be slightly
larger than the tip angle of the general-purpose drill. This
creates a highly accurate hole positioning without causing
chipping on the cutting edge of the drill.
Universal Drill NC-SD 125° NC-SD V 90° Universal Drill

Processing completed Processing completed

Difference between starting drill and center hole drill

It is also possible to use a center hole drill for positioning. If the center hole drill is used first and is allowed to go too deep, there is a chance the general purpose drill will hit the hole diameter instead of the center of the hole location. This can cause the drills cutting edge to chip.

Recommended cutting conditions. Unit：min-1

WorkpieceCutting SpeedDiameter(mm）
Material（m/min）φ3φ4φ5φ6φ8φ10φ12φ16φ20φ25
SS40025 ～40340026002100170013001050850640510410
S50C25 ～3230002300180015001150900750560450360
FC25020 ～3529002200175014501100860720540430350
SCM44015 ～252200160013001100800640540400320260
SUS3047 ～121100800640540400320270200160130
SKD618 ～151200880700590440360300220180150
SKD117 ～121100800640540400320270200160130
AC4C60 ～908000600048004000300024002000150012001000

* Standard feed rates (mm / rev) should be 1% to 3% of the drill diameter. In the case of machining on a curved surface or an inclined surface, please set a consistent feed rate of 0.1 mm / rev.