INNOVATIVE

THREAD WHIRLING
1p
Single ASS
2L
Double EAD SCREW
3T Three IMES FASTER

App for iOS App for ANDROID

NTKCUTTINGTOOLS.com
youtube.com/NTKCUTTINGTOOLS
 Threading

Thread Whirling
Features
New Double-lead video is on

◦NTK's unique patented design technology makes

precise and correct inserts possible the first time,
without any redesign or remanufacturing even if it
is a multiple-lead thread

◦The sharper cutting edges produce a better

surface finish and longer tool life than
competitor's inserts

Form Double-lead or Multiple-lead with Single Pass Patented

Double-lead threads Triple-lead threads

Work Bone screw Worm gear
Work material Ti-6Al-4V ELI brass

Work
appearance

Insert
appearance

Major Dia. φ.157"(4.0㎜) φ.278"(7.0㎜)

Minor Dia. φ.094"(2.4㎜) φ.185"(4.7㎜)
Lead .135"(3.42㎜) .193"(4.9㎜)
[Pitch×No. of Lead] [.067"×2(1.71㎜×2)] [.064"×3(1.63㎜×3)]

◦Can reduce cycle time by more than half

◦NTK can achieve what other competitors cannot

Double-lead Bone Screw Process Example

1 1st thread whirl at taper part

2 Rotate the bar 180°and whirl the 2nd thread on same part as 1
3 Thread whirl whole straight part
4 Thread whirl at very last part to get two-exits, after back of bar has been backed up a
half lead (one pitch) and rotated 180°

2
Special Item Capability

◦Even though almost all bone screw shapes are special, NTK thread whirling inserts
can make the correct shape of thread the first time, without any redesign or
remanufacturing
◦Inserts will be delivered in 5 weeks after the order is received
◦Within a 3 week time period, expedite delivery is available with an expedite fee
◦Basically NTK thread whirling inserts are ground with topping and coated

Recommended Cutting Conditions

No. of teeth
9 6 4
Conditions
RPM 10 - 40 10 - 25 7 - 15 Faster RPM reduces machining time
Main spindle
F 5400 - 14400 3600 - 9000 2500 - 5400

Whirling cutter RPM 1500 - 4000

Feed Rate Same as thread - lead

Bar stock φ ～φ.400" * ～φ.200" * For cutter with φ12㎜ ID

Work Material Ti-6Al-4V ELI / 316SS / Titanium

◦Formula for calculating thread whirling process time

60 × Thread length
Ｔ（Seconds）＝
Main spindle rpm × Feed rate (Thread lead)

Ex.) Double lead / 2" length / .100" lead (2×.050" pitch) / 30 rpm
60 × 2
Ｔ（Seconds）
＝ ＝ 40 Seconds
30 × .100"

Applicable Thread Geometry (Approximated)

The geometries shown above are approximated and could vary by actual applications

3
 Threading
Thread Whiring System

P.C.D. P.C.D. P.C.D. P.C.D.

P.C.D.

φ
φ

φ
φ

φ
Type 1 Type 2 Type 3
Quick-change Quick-change

Machine Spindle NTK No. of φ

Model Location Spindle model Helix angle Stock Type φ P.C.D. Mount adapter bolt
make make Thread whirling system tooth （㎜）

M432-VIII Gang BTW-4000 0°- 15°

BTW-3000
L20/L20E/L20X 0°- 15° TWC9C0746HP1 ● 9 φ12 1 φ46 φ35 M3
Gang BTW-3100
L32/L32X BTW-3100 0°- 15°
L32X BTW-6000 ±25°
L20X ±25°
BTW-5000
M16 0°- 15°
A20
A32 CITIZEN
L20/L20X TWC9C1040HP1 ● 9 φ12 M3
BTW-2000 ±25°
L32/L32X Gang TWC6C1040HP1 ● 6 φ12 1 φ33 φ40 (Provided with
M20 TWC9C1040HP1-D16 ● 9 φ16 spindle)
M32
C32
±25°
L20
CITIZEN BTW-1000
M20 +20°- -25°
M332 ±25°
C12/16 Gang LTR0170
M12/16 LTR0128/LTR0168
±15° TWC9C1037P2 ● 9 φ12 2 φ37 φ30.5 CS0310(M3)
M12/16III Turret MSW105
M20/32III CITIZEN KSW110
L20
Gang LTR0183
M20/32 ±15° TWC9J1040P2 ● 9 φ12 2 φ40 φ32.5 H-M4 × 12
M20/32 Turret LTR0169
M4
K16 Attachment GSW-101 ±15° TWC6P1620HP1-D9 ● 6 φ9 1 φ32 φ26 (Provided with
spindle)
L20 Gang PCM LSW-101-L20 M4
M12/16 MSW-101 ±10° TWC9P1340P2 ● 9 φ12 2 φ40 φ32.5 (Provided with
Turret
M20/M32 KSW-101 spindle)
ECAS-12/20 54178 ±10°
SB-20R Attachment 0M171 -20°- 0°
SR-20J/20RIII/20RIV 54172
-20°- 0°
ECAS-20T 59172
ECAS-32T 58171 ±20°
STAR SR-38 STAR 10172 ±10° TWC9S1640P2 ● 9 φ12 3 φ40 φ33 CS04148S(M4)
ST-38 43156 ±20°
Turret
SV-12 45172 ±10°
SV-20/SV-20R 42173 ±10°
SV-32 43172 ±10°
SV-38R 43156 ±20°
BH20/BH38 Turret 3263-Y481 ±10° TWC9TS2252P2 ● 9 φ12 3 φ52 φ42 CS0515(M5)
BS20 Attachment 3214-Y1371 ±10° TWC9TS20550P2 ● 9 φ16 3 φ50 φ40 CS0515(M5)
SS20/SS26/SS32
3268-Y450 0°- 10° TWC9TS2244HP1 ● 9 φ12 4 φ52 φ44 CS0520(M5)
B0265/B0266-II
3268-Y451
B0325/B0326-II
3281-Y450 0°- 20° TWC9TS1944HP1 ● 9 φ12 4 φ52 φ44 CS0520(M5)
S205/S206
TSUGAMI 3281-Y451
TSUGAMI B0123/B0124/B0125/ Attachment 0°- 25° TWC9TS1644HP1 ● 9 φ12 4 φ52 φ44 CS0515(M5)
B0126-II/III 3220-Y6540
B0203/B0204/B0205/ 3220-Y6541 0°- 30° TWC9TS1044HP1 ● 9 φ12 4 φ52 φ44 CS0515(M5)
B0205/B0206-II/III
0°- 10° TWC9TS1952P2BK ● 9 φ12 4 φ52 φ38 CS0515(M5)
SS20/SS26/SS32 3268-Y271
0°- 20° TWC9TS1652P2BK ● 9 φ12 4 φ52 φ38 CS0515(M5)
For single-corner
SS207/SS267/SS327 － Using B-axis 0°- 15° TWC4TS3010HP1 ● 4 φ7 5 φ10
inserts only

4
 Type 4 Type 5 Type 6
Quick-change

P.C.D.
φ

Type 7

Machine Spindle NTK No. of φ

Model Location Spindle model Helix angle Stock Type φ P.C.D. Mount adapter bolt
make make Thread whirling system tooth （㎜）

DECO 10/10a 224-1900

±15° TWC6TO11542HP1 ● 6 φ12 4 φ42 φ32 CS0410(M4)
Evo DECO 10/10 242-1900
DECO 13a/13e 226-1900
Evo DECO 16/10 243-1900
TORNOS Swiss ST26 Attachment TORNOS 246-1900 ±15° TWC9TO10540P2 ● 9 φ12 3 φ40 φ31 CS0410(M4)
DECO 20a 223-1900
DECO 26a 225-1900
Sigma 20 234-2750
±25° TWC9TO12050P2-D18 ● 9 φ18 3 φ50 φ40 CS0410(M4)
Sigma 32 236-2750
HASEGAWA JS-1W － HASEGAWA － 0°- 20° TWC9HA22594P2 9 φ16 6 φ94 φ76 CS0620(M6)

■Spare Insert Holder (Cartridge) ■Spare Parts

φ
Item number No. of tooth Compatible cutters Description Item number
(㎜)
TWC6HP2 6 12 For Type 2 and Type 3＊ For 4㎜ thick inserts FSI17-2.2×6.0
Insert Screw
TWC9HP2 9 12 For Type 2 and Type 3＊ For 6.5㎜ thick inserts FSI24-2.2×7.9
TWC9HP2-D16 9 12 For Type 6 Wrench T-07
Note: Insert holder comes with insert screws and wrench Insert Holder Mounting Bolt CS0309-TＷ
Insert holder mounting screw is not included
＊‌Cannot be used for TWC9TS20550P2, TWC9TO12050P2-D18 and TWC9HA22594P2

NTK's Unique Attachment System

NTK’s whirling insert holder can be attached and detached without removing mounting screws

Mount Adapter Insert Holder

Insert Holder Mounting Screw Insert Adapter Mounting Screw

① Loosen the Mounting Screws ② Rotate the Insert Holder 10 degrees ③ Detach the Insert Holder without
removing the Mounting Screws

●：Stock ○： 1-2 week delivery

5
 Threading
Basic Insert Grade

ZM3
◦ZM3 is our basic grade for NTK thread whirling
◦ZM3 offers excellent surface finish
◦NTK can make inserts with other coatings to meet customers demands

NTK Experiences and Solutions Example

For absolute flat on OD For tiny thread

Single-lead Double-lead Double-lead

◦‌Two insert combination brings absolute flat on OD to ◦‌NTK's Thread Whirling system can
machine small diameter multi-lead
meet the drawing screws to spec, with lower tool
pressure, by using several types of
specially designed and accurately
ground inserts on the cutter.

Standard Thread Whirling Inserts (two-sided) for ISO Style Threads

(Note: Must use Thread whirling cutters with 12㎜ φDm dimension. See page U18-19 to find φDm for each cutter.)

Screw head 60° Screw head

Screw head

ISO5835 HA ISO5835 HB ISO9268 HC ISO9268 HD

Metric dimensions

Supposition Coated Carbide

Item number ISO Standard P e r4 r5 material Dia. ZM3
0 0
TW5835-HA1.5-D12 HA1.5 1.5 －0.15 1.1 －0.1 0.5 0.1 0.3 0.1 35° 3° ○
0 0
TW5835-HA2.0-D12 HA2.0 2.0 －0.15 1.3 －0.1 0.6 0.1 0.4 0.1 35° 3° ○
0 0
TW5835-HA2.7-D12 HA2.7 2.7 －0.15 1.9 －0.15 1 0.1 0.6 0.2 35° 3° ○
0 0
φ8
TW5835-HA3.5-D12 HA3.5 3.5 －0.15 2.4 －0.15 1.25 0.1 0.8 0.2 35° 3° ○
0 0
TW5835-HA4.0-D12 ISO5835 HA4.0 4.0 －0.15 2.9 －0.15 1.5 0.1 0.8 0.2 35° 3° ○
0 0
TW5835-HA4.5-D12 HA4.5 4.5 －0.15 3.0 －0.15 1.75 0.1 1 0.3 35° 3° ○
0 0
TW5835-HA5.0-D12 HA5.0 5.0 －0.15 3.5 －0.15 1.75 0.1 1 0.3 35° 3° φ10 ○
0 0
TW5835-HB4.0-D12 HB4.0 4.0 －0.15 1.9 －0.15 1.75 0.1 0.8 0.3 25° 5° φ8 ○
0 0
TW5835-HB6.5-D12 HB6.5 6.5 －0.15 3.0 －0.15 2.75 0.2 1.2 0.8 25° 5° φ10 ○
TW9268-HC2.9-D12 HC2.9 2.79 to 2.9 2.03 to 2.18 1.06 0.1max ― ― ― ―
TW9268-HC3.5-D12 HC3.5 3.43 to 3.53 2.51 to 2.64 1.27 0.1max ― ― ― ―
TW9268-HC3.9-D12 HC3.9 3.78 to 3.91 2.77 to 2.92 1.27 0.1max ― ― ― ―
ISO9268 φ8
TW9268-HC4.2-D12 HC4.2 4.09 to 4.22 2.95 to 3.25 1.27 0.1max ― ― ― ―
TW9268-HD4.0-D12 HD4.0 4.0±0.03 2.92±0.03 1.59 0.1 ― ― 45° 10°
TW9268-HD4.5-D12 HD4.5 4.5±0.03 2.92±0.03 2.18 0.1 ― ― 45° 10°
●：Stock ○： 1-2 week delivery

6
 Application Examples

Double - lead Bone Screw Double - lead Bone Screw

Work Material：Ti - 6Al - 4v ELI Work Material：Ti - 6Al - 4v ELI
Bar Stock Dia. φ.375 Number of start 2 Bar Stock Dia. φ.350 Number of start 2
Major Dia. φ.157 Helix Angle 28.5° Major Dia. φ.180 Helix Angle 23.0°
Minor Dia. φ.098 Hand of thread Right Minor Dia. φ.120 Hand of thread Right
Cutting condition Cutting condition
Main Spindle Speed Speed of whirling cutter Main Spindle Speed Speed of whirling cutter
15 3,500 12 2,500
（rpm） （rpm） （rpm） （rpm）
Lead = Feed Lead = Feed
.217 Result OK .200 Result OK
（IPR） （IPR）

NTK NTK
Thread Whirling
Dramatically improved productivity Thread Whirling
Dramatically improved productivity

Cannot complete with single Cannot complete with single

Competitor's Thread pass. Requires feeding stock Competitor's Thread pass. Requires feeding stock
Whiring multiple times and two passes Whiring multiple times and two passes
for threading each time. for threading each time.
NTK thread whirling succeeded in double lead screw machining when The customer could not get perfect double lead thread form in
one of the major thread whirling suppliers has failed many times. single pass from other manufacturers. NTK got perfect thread
form with a single pass on first trial saving cycle time.

Double - lead Bone Screw Single - lead Bone Screw

Work Material：Ti - 6Al - 4v ELI Work Material：316SS
Bar Stock Dia. φ.250 Number of start 2 Bar Stock Dia. φ.315 Number of start 1
Major Dia. φ.118 Helix Angle 15.4° Major Dia. φ.138 Helix Angle 7.5°
Minor Dia. φ.083 Hand of thread Right Minor Dia. φ.098 Hand of thread Right
Cutting condition Cutting condition
Main Spindle Speed Speed of whirling cutter Main Spindle Speed Speed of whirling cutter
11 2,200 23 2,000
（rpm） （rpm） （rpm） （rpm）
Lead = Feed Pitch = Feed
.087 Result OK .049 Result OK
（IPR） （IPR）

NTK NTK
Thread Whirling
Dramatically improved productivity Thread Whirling
2600 pcs

Cannot complete with single

Competitor's Thread pass. Requires feeding stock Competitor's Thread
Whiring multiple times and two passes Whiring 1000 pcs
for threading each time.
Customer was concerned with stock rigidity and long cycle Some thread whirling manufacturers offer 6-teeth or 12-teeth systems,
time. NTK applied three geometry inserts to achieve single pass too many teeth cause chip packing issues and more tool pressure. Fewer
machining, in dramatically short time. The up-sharp cutting edges teeth means greater cycle time. NTK concluded that 9-teeth is the best
and low cutting pressure produced "excellent" surface finish. configuration. Our customers can run 1.5 times faster and get longer tool life.

Single - lead Bone Screw Triple - lead Worm Gear

Work Material：Ti - 6Al - 4v ELI Work Material：Brass
Bar Stock Dia. φ.197 Number of start 1 Bar Stock Dia. φ.315 Number of start 3
Major Dia. φ.091 Helix Angle 5.3° Major Dia. φ.276 Helix Angle 14.6°
Minor Dia. φ.067 Hand of thread Right Minor Dia. φ.185 Hand of thread Left
Cutting condition Cutting condition
Main Spindle Speed Speed of whirling cutter Main Spindle Speed Speed of whirling cutter
30 3,100 20 3,500
（rpm） （rpm） （rpm） （rpm）
Pitch = Feed Lead = Feed
.023 Result OK .189 Result OK
（IPR） （IPR）
Multi-lead threads, common in the Worm Gear industry are made
NTK by a forming or cutting process. The large helix angle is difficult
Thread Whirling
2200 pcs to machine with single-point threading.
NTK now makes thread whilring inserts for multi-lead threads.
This thread is up to 1.26" length with a small pitch. Cycle time Cycle time is reduced with a one pass process and thread form
could be increased with a single-point threading tool. NTK's dimensions are stable with the low tool pressure.
inserts, designed for lower tool pressure, ran 2,200 pcs/corner at
30 rpm of bar stock (F10,800). It only took 110 seconds to finish
a 1.26" length thread.

7
 Double lead Screw in single pass video is on YouTube
North and South America
NTK CUTTING TOOLS USA NTK CUTTING TOOLS MEXICO NTK CUTTING TOOLS BRAZIL
a division of NGK SPARK PLUGS (U.S.A), INC. a division of Bujías NGK de México, S.A. DE C.V. a division of NGK DO BRASIL LTDA.
46929 Magellan Drive, Carretera Lago de Guadalupe, Rodovia Professor Alfredo
Wixom,MI 48393, U.S.A. Km. 27.5, S/N, Bodega 3-A, Rolim de Moura(SP-88),
Tel.; +1-248-668-0100 Col. San Pedro Barrientos, km.61, s/n, Bairro Cocuera,
Fax; +1-248-668-0200 Tlalnepantla, Estado de Caixa Postal 2540,
www.ntkcuttingtools.com México, C.P. 54010 CEP 08780-970,
Tel.; +52-55-5317-5872 Mogi das Cruzes-SP, Brasil
Fax; +52-55-5317-5876 Tel.; +55-11-4793-8265
www.ntkcuttingtools.com/mx/ Fax ;+55-11-4793-8270
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JAPAN / Head office EUROPE

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a division of NGK SPARK PLUG CO.,LTD. a division of NGK SPARK PLUG EUROPE GmbH a division of NGK SPARK PLUGS (U.K), LTD.
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Aichi Ratingen, Germany Hemel Hempstead Herts.
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Tel.; +81-568-76-1538 Fax; +49 2102 974-399 Tel.; +44 1442-281-000
Fax; +81-568-76-1288 www.ntk-cutting-tools.com Fax; +44 1442-281-080
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ASIA
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a division of NGK SPARK PLUGS (THAILAND) CO.,LTD. a division of P.T. NGK Busi Indonesia a division of NGK Spark Plug (Shanghai) Co., Ltd. a division of NTK TECHNICAL CERAMICS KOREA CO.,LTD.
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DISTRIBUTED BY

SPARK PLUGS (USA), INC.

NTK Cutting Tools USA

a division of NGK SPARK PLUGS (U.S.A), INC.
46929 Magellan Drive, Wixom, MI 48393, U.S.A.
Toll Free: 866-900-9800
ctinfo@ntktech.com
www.ntkcuttingtools.com
【Aug.,2016】