Page 628 - Yamawa_European_Catalogue_YEU21

Center Drills

NC-SD V
Intro

SP
NC Starting Drills for Chamfering (90°) and Center
Positioning (125°), Coated
FEATURES
90° type for hole chamfering.
SL
HSS-Co COATING 125° for center positioning, improves drill performance.
HSSCo and special coating for stable and long life.

PO
P1 P2 P3 M1 M2 P7 K1 K2 N1 N2 N3 N4

Low carbon Carbon and Medium Stainless Grey Nodular Aluminium
Work-materials steel low alloy alloy steel steel cast iron cast iron Aluminium die cast
ST steel
Vc (m/min) 25÷40 25÷32 15÷25 7÷12 20÷35 20÷35 60÷90 60÷90
DC fn (mm/rev) fn (mm/rev) fn (mm/rev) fn (mm/rev) fn (mm/rev) fn (mm/rev) fn (mm/rev) fn (mm/rev)
1 0.03÷0.06 0.03÷0.06 0.03÷0.06 0.03÷0.06 0.03÷0.06 0.03÷0.06 0.03÷0.06 0.03÷0.06
1.5 0.05÷0.10 0.05÷0.10 0.05÷0.10 0.05÷0.10 0.05÷0.10 0.05÷0.10 0.05÷0.10 0.05÷0.10
ROLL 2 0.08÷0.15 0.08÷0.15 0.08÷0.15 0.08÷0.15 0.08÷0.15 0.08÷0.15 0.08÷0.15 0.08÷0.15
2.5 0.10÷0.18 0.10÷0.18 0.10÷0.18 0.10÷0.18 0.10÷0.18 0.10÷0.18 0.10÷0.18 0.10÷0.18
YMW-NC-SD V
3 0.15÷0.20 0.15÷0.20 0.15÷0.20 0.15÷0.20 0.15÷0.20 0.15÷0.20 0.15÷0.20 0.15÷0.20
4 0.15÷0.25 0.15÷0.25 0.15÷0.25 0.15÷0.25 0.15÷0.25 0.15÷0.25 0.15÷0.25 0.15÷0.25
CARBIDE 5 0.15÷0.30 0.15÷0.30 0.15÷0.30 0.15÷0.30 0.15÷0.30 0.15÷0.30 0.15÷0.30 0.15÷0.30
6 0.20÷0.30 0.20÷0.30 0.20÷0.30 0.20÷0.30 0.20÷0.30 0.20÷0.30 0.20÷0.30 0.20÷0.30

Normal drill NC-SD V 90° NC-SD 125° Normal drill
LONG
Drilling process is Drilling process is
fi nished. fi nished.

HAND
TAPS

EG (STI)

Diff erence between starting drills and center drills
For positioning, center drills can also be used. However in the case of center drill,
SPECIAL since cutting edge of normal drill fi rst hits the material, this can cause chipping on
THREADS, cutting edge and slant drilling.
GAUGES

THREAD
MILLS

DIES

CENTER
DRILLS
YMW

Technical
info

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