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NC-SD V NC-SD

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

SpecificationSpecification
Coating
For icon explanation, refer to P.50For icon explanation, refer to P.50
Product featuresProduct features
After boring with normal drills, use NC-SD V(90 °) larger than NC-SD is the drill specially for positioning. It is used before
bore hole diameter, and we can obtain clean countersinks with boring holes to heighten positioning accuracy. Having the point
better surface finish.angle of a little bit larger degree than normal drill, NC-SD
guarantees high positioning accuracy without chippings at its
cutting edge.
Normal drill NC-SD 125° NC-SD V 90° Normal drill

Drilling process Drilling process is finished. is finished.

Difference between starting drills and center drills

For positioning, center drills can also be used. However in the case of center drill, since cutting edge of normal drill first hits the material, this can cause chippings on cutting edge and/or undesirable one side cutting.

Recommended cutting condition

unit ： min-1

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

※ For feeding parameter (mm/rev), select 1-3% of the diameter as a basic rule. When cutting on curved face or slanting face, always choose 0.1mm/rev for feeding parameter.