Page 614 - Yamawa_European_Catalogue_YEU23

Center Drills

Intro
NC-SD V

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

Carbon and
Low carbon Medium Stainless Grey Nodular Aluminium
Work-materials low alloy Aluminium
steel steel alloy steel steel cast iron cast iron die cast
ST
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
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 YMW-NC-SD V
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
finished. finished.

HAND
TAPS

EG (STI)

Difference 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 first 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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