MICRON CHUCK

Outstanding Clamping power.
Minimal runout.

Why Micron Chuck?

POINT

1
1

HIGH PRECISION MILLING CHUCK

Only Micron Chuck can guarantee such runouts
as 0.001mm at chuck nose and 0.002mm at 3xD.
Micron Chuck was developed utilizing Showa original direct clamping
mechanism and assembling technology acquired in manufacturinghigh quality machine spindles for a long experience.

● How to measure runout
3D POINT
2μｍ

D

CHUCK NOSE
1μｍ

GRADE

NOSE

3D POINT

AA

1

2

A

3

5

Tool will be supplied with an inspection sheet.

● Structure of Micron Chuck● Structure of other makers' chuck

Thrust-Ring Tightening Nut Clamping section of bodyTightening Nut
Ball Screw mechanism

Thrust-Ring

1

Thrust-Ring retention bearing

Sliding Thrust-Ring
Torsional stress is caused.

No Torsional stress.

Main body of chuck

Needle rollers

UNCLAMPEDPOSITION

CLAMPEDPOSITION
Face &Taper contact

Main body of chuck

POINT

2
2

Clamping power as high as other milling chucks.
High accuracy Micron Chuck has a high clamping power,too.
The clamping power of ø32 ID Micron chuck is
2,450Nm, and ø6 ID 49Nm - about 2 times bigger thanhydraulic chucks.

Standard type Micron Chuck

2,450N•m

POINT

3
3

The cutter is not axially moved by clamping
The cutter is not withdrawn by clamping like collet chucks,
due to its unique mechanism. It is required in mass manufacturing line
to preset cutter length to close tolerance. In case of collet chuck,
the axial cutter projection is shortened by clamping. The back endof the cutter is pressed to the back-up screw at that time, which may
cause bending and breakage of small dimeter cutters.

StableWithdrawn

MICRON CHUCKCOLLET CHUCK

2POINT

4
4Highly balanced and sealed chuck.
Maximum speed :20,000min -1 (Standard HPC-H chuck)
30,000min -1 ("G" type HPC-H chuck)Standard#30,#40
HSK50, 63#50
HSK10010,000min-1

8,000min-1

20,000min-1

12,000min-1

G

30,000min-1－－

15,000min

10,000min-1

A
AA
A

H

M

AA

-1

"G" type HPC-H chuck

30,000min-1
POINT

5
5

POINT

6
6

Thru-the-tool coolant type.
Thru-the-tool coolant type Micron Chucks available.
Please specify it at the time of ordering.

■ Thru-the-tool application

Mechanical chuck, Heater is not required.
Shrink-fit holders have restrictions of cutter material. But,
Micron Chucks are applicable to any material of cutters,
keeping high accuracy for a long period of time.

"M" type
Micron Chuck

3

POINT

7
7

POINT

8
8

Wide range of IDs are available.
Standard type, "H" type and "M" type Micron Chucks
covers from ø3mm to ø50mm ID.

Wide application range.
You can extend application range of Micron Chucks byusing straight collets. But, direct chucking is recommended
to obtain the highest performance.

COMPARISON OF RUNOUT & SURFACE FINISH

MICRON CHUCK

RunoutHYDRAULIC CHUCKCOLLET CHUCK

3μm at chuck nose,
5μm at 3×D.

N made AA
AA gradecollet : 5μm at 4×D(There is no guarantee at the timeof attaching the holder)

26.5N・m(N made ø6 chuck)

49N・mShowa ø6 collet(10 ID max. holder)

Periodical greasing
since a mechanical chuck.

Periodical check of oilleak required.

Chips must be removed
from collet.

Easy presetting, sincecutter is stable.

Easy presetting, sincecutter is stable.

Cutter is axially moved
by chucking.

AA
A grade : 1µm at chuck nose,
2µm at 3×D guranteed.

REMARKS

Micron chuck :Measured runout.
Others : From catalog.

Measure value

Clamping Power

Maintenance

Presetting

φ6
φ32

49N・m
2450N・mDIMENSIONS[ø6 49N•m] is the maximumof HPC06H long type

BT P.37-44 SK P.100-102 HSK P.109-116
4

Clamping power & Tightening Force
Standard
Chuck size

Clamping
Power（MIN）
（N・m)

HPC16

780

HPC20

1180

HPC25

1760

HPC32

2450

HPC42

3920

H-series
Chuck size

Clamping
Power（MIN）（N・m)

HPC03H

10（10）

HPC04H

15（15）

HPC06H

30（20）

HPC08H

40（24）

HPC10H60（35）

HPC12H70（41）

HPC14H80

HPC16H90

Tightening
Force
（N・m)

Loosening
Force
（N・m)

62

40

Tightening
Force
（N・m)

Loosening
Force
（N・m)

67

67

※Clamping power of short type chucks (L=75mm max) is shown in ( ).

M-series

NEW

5

Chuck size

Clamping
Power（MIN）（N・m)

HPC03M5

HPC04M7

HPC06M20

HPC08M26

HPC10M33

HPC12M

46

Chuck size

Clamping
Power（MIN）（N・m)

HPC03N2

HPC04N4

HPC06N20

HPC08N26

HPC10N33

HPC12N

46

N-series

Tightening
Force
（N・m)

Loosening
Force
（N・m)

57

57

Tightening
Force
（N・m)

Loosening
Force
（N・m)

50

50

Application examples

1
Workplace

Cylinder Head Valve Guide Hole (FCD)

Cutting tool

Carbide Reamer 6mm×135L

Conventional Chuck

Competitor’s Collet Chuck

SHOWA Chuck

SHOWA Micron Chuck HSKA63-HPC10H-105A

Test result①Though conventional collet chuck required 30min to achive 10micron runout. SHOWA
Micron chuck was able to achieve 3 - 5micron at 8×D with just one clamping.
②As a result, a longer tool life is realized from 50 - 100 holes to 1600 holes.

Workplace

Cylinder Block Oil Jet Hole (FC230)

Cutting tool

Carbide Reamer 9mm×180L

2

Conventional Chuck
SHOWA Chuck

Micron Chuck
M TypeHydraulic Chuck+Straight shank shrink fit extension
SHOWA Micron Chuck HSKA63-HPC10M-254

Test result

Increased cutting tool life from 400 to 1000 holes, thereby reducing cutting tool costs
and tool changing costs

WorkplaceHydraulic Parts Cover（ADC12）

Cutting tool

Carbide Step Reamer 20mm×200L

3

Conventional Chuck
SHOWA Chuck

Competitor’s Milling Chuck
SHOWA Micron Chuck BT40-HPC25-105A

Test result

Measuring Position

SHOWA

Competitor

180mm
290mm

0.005
0.017

0.015
0.03

②No more chattering

290mm①Runout Comparison on the M/C

180mm

290mm

4
Workplace

Cylinder Head Cubing (ADC)

Cutting toolDiamond Reamer

Conventional Chuck
SHOWA Chuck
Test result

Competitor’S Hydraulic Chuck
SHOWA Micron Chuck HSKA63-HPC25-115AA

Micron Chuck

Hydraulic chuck produced oval holes.Micron chuck produced perfect circular holes.

6

HARD CHUCK
Chuck body
Spring collet

Outstanding power andaccuracy created by ball screws

Ball screw mechanism
Thrust ball mechanism

Ball screw mechanism is employed first time to milling chuck.
USA PAT.

POINT

1
1

POINT

2
2

7

JP PAT.

A long seller Collet Chuck which employs ball screw mechanism
for the first time in the world. Various shank types and sizes are available
for wide range of applications.

Clamping power increased by 3～5 times.
The ball screw creates high clamping power by drawing
in the cutter when the nut is tightened.
The high clamping power is obtained in any place of thespring collet. Clamping power is multiplied by 3～5 times
compared with non-ball screw chucks.

Accuracy is increased by original spring collet.
High accuracy is obtained, since the collet is freefrom twisting force due to the thrust ball structure.
SHOWA original way of manufacture and heat treatment,high accuracy of the Spring Collet is maintained
for a long period of time.

POINT

3
3

POINT

4
4

High rigidity is realized by thick wall structure.
Very thick wall of Hard Chuck provides high chucking power,
high rigidity and accuracy, even in hard jobs.

Very easy to clamp and unclamp.
The SHOWA original ball screw mechanism provides easy chucking. A cutter isclamped and unclamped only by a half turn of the nut.
(The nut is fixed by a built-in braking mechanism)

Standard type

Wonderful powerof steel ball

Steel balls are used as a rolling transmission,by which the chuck can be clamped with lesshand power. The ball screw race of the nut andchuck body is finished by close tolerance
grinding, to realize highest accuracy, chucking
power and rigidity.

DIMENSIONS

BT P.45,46 HSK P.117 ST P.149 NT P.157 MT P.159
8

COLLET CHUCKThis chucks are most suitable chuckfor drilling, milling, reaming, tapping.

POINT

1
1

High accuracy collet①High accuracy collets are used.

②The Collet is made of quality alloy steel which
minimizes strain and wear.
（A）

L

（B）

4×d

φd

φD

Grade

Taper（16°）

POINT

2
2

Smallest diameter is 0.5mm.
CHUCK

RSC07
RSC10
RSC13
RSC16
RSC20

POINT

3
3

9

COLLET I.D.
（mm）

GRIPPING RANGE
（mm）

ø1～ø7
ø1～ø3
ø4～ø10
ø1～ø3
ø4～ø13
ø1.5～ø3
ø4～ø16
ø2～ø3
ø4～ø20

0.5
0.5
1.0
0.5
1.0
0.5
1.0
0.5
1.0

Wide use collet.
Standard 16°(DIN6499/ISO15488) taper collet,
the most popular in world.
Major CNC makers are adopting this collet as standard
items for milling collet chucks.

AA

RunoutNose

4D Point

1μm

3μm

POINT

4
4

Through-the-tool coolant
For coolant thru the tool application.
High pressure up to 7 Mpa is acceptable.
Standard holders and nuts can be used.
Bearing of nut is not affected by coolant.
Standard NutStandard Holder

Shut oﬀ coolant leakage

cutting oil

Insert the cutter to the back of the collet.

POINT

5
5

Tool with oil hole

Nut and Adjust screw

Ball bearings are used to reduce friction.
Trapezoidal thread is used for higher accuracy.

Two pieces structure is used to reduce run out
caused by set off cutting tool.
Adjustment is projection length of the cutting
tool from holder shank side.
It is available for tang shape cutting tools.

POINT

6
6

Special coating
Holder doesn’t rust due to special rust proof treatment on full surface.

10

SYNCHRO TAP HOLDER
MODEL SYFN, SYFS
INFINITESIMAL FLOATING SYNCHRONIZED TAP HOLDER

Screw processing is processed by self-propelled rotation of one rotation and one pitch, so there is no
stability of screw precision (angle) and blade life unless it is 100% synchronized. Gauge is also required
for screw precision, but unless angle and circularity are out, it can not be said that the accuracy of first andsecond grade is high. Machine and tap as well as manufacturing, because there is processing tolerance,
it is impossible to make it 100%, so tap holder with minute stretch and radial float mechanism is necessary.

POINT

1
1

Compensates for synchronous error

POINT

Structure2
2

It compensates for synchronous error not only axially,but
also radially. Infinitesimal radial error caused by machining
can be corrected by the original mechanism.

Maintenance is not needed by using durable O-ring.
Since through-the-tool coolant and also alongsidethe cutter coolant can be applicable, standard tap
can be usable as well.
Maximum coolant pressure of
SYFN : 7 M pa is applicable.
SYFS : 5 M pa is applicable.

O-ring (Radial Float)

Steel Ball

O-ring (Tension,Compression)

POINT

3
3

11

Tap holder for small diameter
Tap holder for small diameter doesn’t clamp tap by collet,
but clamps tap directly, and this makes it possible to avoid
breakage of M1, M1.6 and M2, too.

POINT

4
4

POINT

5
5

Acceptable tap size
HOLDER

COLLET

JIS TAT P SIZESYFS02

̶

M1、M1.6、M2、No3、No4

SYFS03

̶

M3、No5、No6

SYFN12

CR13GB/GH

M4～M12、No8～U1/2、P1/8

SYFN20

CR20GB/GH

M4～M20、U5/16～U5/8、P1/8～P3/8

Machining Performance
Test cut with synchro tap holder and collet chuck with the same program.
Diﬀerence when processing resin material

Left: Synchro tap holder SYFN type has good thread
thread accuracy, and transparency is high because
the load on the cutter is reduced.
Right: In the fixed holder (collet chuck), transparency is low.
With the Synchro Tap infinitesimal float is used,
increasing the degree of transparency,
thereby illustrating the accurancy of threads are improved.

Left:SYFNRight:Collet ChuckDiﬀerence when small diameter tapping.
Work

R6-Block

Material

Aluminum

Holders

BT30-EDC06-090
M1.6×0.35 TAP

Cutting tools

N=260min-1

Cutting conditions
Life
Eﬀect

BT30-SYFS02-095

Exchange in about 200 holes(requiring regrinding)

F=910min/min
Exchange in about 200 holes(requiring regrinding)

Improvement of cutting tool life (about twice)

DIMENSIONS

BT P.63 SK P.103-105 HSK P.130
12

COLLET CHUCK（SLIM TYPE）

By a super slim body,it minimizes the interference of work & jig.

POINT

1
1

Super slim nut and body diameter.

φＤ

POINT

2
2

CODE

øD

CHUCK

ER11MN16

SSC07

ER16MN22

SSC10

ER20MN28

SSC13

ER25MN35

SYFN16S

Standard 16°（DIN6499/ISO15488）taper collet,
the most popular in world.
①Smallest diameter is 0.5mm
CHUCK

SSC07
SSC10
SSC13
SYFN16S

COLLET I.D.
（mm）

GRIPPING RANGE
（mm）

ø1～ø7
ø1～ø3
ø4～ø10
ø1～ø3
ø4～ø13
ø1.5～ø3
ø4～ø16

0.5
0.5
1.0
0.5
1.0
0.5
1.0

②High accuracy collets are used.
③The Collet is made of quality alloy steel which
minimizes strain and wear.
（A）

L

（B）

4×d

φd

φD

GRADE

AA

RUNOUT
NOSE

4D POINT

1μm

3μm

Taper（16°）

DIMENSIONS
13

BT P.59 HSK P.127

POINTLong adapter for synchronized tap holder（COLLET CHUCK SLIM TYPE）
3
3

It is possible to use it as a long adapter by chucking it with
Synchro Tap Holder SYFN20 type.

TAP HOLDER（SYFN20）

L

L4

φD

φD1

（50）

M

COLLET
CR-GB，GH

L2

POINT

4
4

COLLET
CR，CROH

ADAPTER
MODEL

øD

øD1

L4

M

TAP HOLDER
MODEL

øD

øD1

L2

M

ST16-SSC07-L

16

1650, 100
150

M6

SYFN16S-L2

35

－

35,65
95,125,155

M16以下
M16

ST20-SSC10-L

22

2050, 100
150, 200

M10

ST20-SSC13-L

28

20

100
150

M12

When it is necessary to dig a deeper hole fortap processing of M14-M16, it is possible touse by tap holder SYFN16S type without
long adopter.

It is available as a long adopter for small diameter drill processing

DIMENSIONS

BT P.64 SK P.106 HSK P.131 ST P.148
14

TRACTION DRIVESPEED
ACCELERATOR
Full-functions in a compact body.

POINT

1
1

Basic principle①Power of the traction drive is transmitted by the rolling contact
mechanism via oil film of traction grease characterized by highviscosity at high pressures.
②Contact pressure P is created at each contact surface on planetaryrollers, a sun roller and a stationary housing, which are assembled
with elastic deformation.
By this pressure, the oil films changes to high viscosity one(only when contact pressure P is imposed) so that the power can betransmitted at the roller contact area.
③The traction force T is formulated by Equation (1).
T=μP ……… (1)where, μ:Traction coefficient, P:Contact pressure④This unit is a speed increasing device which the revolution of theplanetary roller is used for input side and the rotation of the sun roller
is output side.
The speed increasing ratio is formulated by Equation (2).
Ｄ ……… (2)n=1+ｄwhere, D:Bore diameter of stationary housing
d:Outside diameter of sun roller

Planetary rollers

High viscosity oil film
Sun roller

Stationary housing

15

Ｔ

Traction force（Rolling transmission power）

POINT

2
2

Features

Positioning Block

Orientation Ring

(Optional for use on M/C)
The positioning block and pinmechanism supplies coolant
to the tool.

The fitting position of a positioning block
differs among machining centers. The
position can be adjusted by rotating theorientation ring within 360°.

Positioning Pin

Coolant Nozzle"One-touch" adjustment,with in a height range of 40mm.

The angle adjustment of the coolant
nozzle can be made easily by hand.
The spray angle of the coolant is adjusted
to match the inserted cutter length.

PAT.P

Nut

ColletThe balance adjustment is alreadymade in the factory.

Only a under super precision collet, runout
within 3 microns, should be used.
Various sizes can be supplied by mm unit.
Please order sizes to match the shanks oftools to be used.

More widely usable,
due to its adaptability toa great variety of M/C
spindles.

Cutters
Grinding
wheel

End millDrill

A drill, end mill and grinding wheel with astraight shank can be applied.

ATC-ReadyCompact and light, the TDU is ready for ATC… with no
extra attachments necessary.

Low Vibration
The Traction Drive Unit is particularly smooth-running, andwithout noise vibration, it even makes grinding possible on
your M/C.

Transmission PowerA stable torque transmission produced stable rpm, unlike air
motor speed accelerators.

High Speed
Since the traction drive is run by a transmission mechanism
based on rolling contact, high lubrication can be maintainedeven at high speed rotation.
The uses of ceramic bearings and through-body coolant areincorporated to ensure reliable, long-lasting high speed
operation.
DIMENSIONS

BT P.93,94
16

POINT

3
3

A complete series supports a full range of applications.

TDU40

TDU17-N

Super rigid TypeStandard Type

3.4×Spindle rev. Max.12,000rpm

6×Spindle rev. Max.30,000rpm

Cutting Example [Groove Milling]

Cutting Example [Groove Milling]

Material ： Aluminum alloy
End mill ： 16mm dia. T/C, 2-blade
Speed： 12,000rpm
Cut. depth： 5mm
Feed： 1000mm/min

Material ： Aluminum alloy
End mill ： 4mm dia. T/C, 2-blade
Speed： 28,000rpm
Cut. depth： 2mm
Feed： 1,000mm/min

Super rigid type

Standard type

Type

TDU40

TDU17-N

Speed increasing ratio

3.4×

6×

Speed (rpm)（min -1）

MAX. 12,000

MAX. 30,000

Output torque

（Nm）

7

1

Output power（kw）*1

8.8

3.1

BT50

BT40 / BT50

φ1.5～20

φ0.5～10

11.5

5.4 / 7.9

Taper *2
Tool grip diameter (mm)Net weight

17

（kgW）

*1 Max. output for each max. speed.
*2 Other tapers are also available:
SK40,CV40,HSK63 equivalent to BT40.
SK50,CV50,HSK100 equivalent to BT50.
Warranted total running time : 2,000hrs
Period of warranted : One year

Cutting power（Ｗ）

1

Application range

10
TDU40
TDU17
5

0

1

2

Slip ratio（％）

2

Torque transmission
characteristics

3 Runout and Bending rigidity

32
Output speed（×10 4 rpm）

4

T DU4 0

TDU1 7

1

0

0.5

1.0
1.5
6.5
7.0
Output torque（N・m）） （1N・m ≈ 0.1kgf・m）

T
Type

Runout（μm）*1

Bending rigidity（N/μm）*2

TDU40

≦5

30≦

TDU17

≦5

10≦

7.5

8.0

Displacement ①

Main spindle

Ｗ（Load））

Displacement ②*1)： Runout of main spindle

RunoutW*2)： Bending =rigidity(Displacement② - Displacement①)

4

Temperature rise
（Temperature-Coolant
Temperature-Coolant
temperature）

Temperature rise（゜Ｃ）／μm ～ 0.1kgf／
（１N／
／μm）

50
40

TDU17（30,000rpm）
TDU40（12,000rpm）

30① Housing②20② Output spindle

100

Radiation thermometer①

Coolant pressure ： 200k P a（2kg f/F ）

10

20
30
Running time（min）

40

50

Coolant temperature： 20:
Room temperature ： 20:（ Coolant amount： 15R /X ）5

Axial displacement

100
Displacement（μm）

4
4

Covering a wide application range…

80

TDU17（30,000rpm）
TDU40（12,000rpm）

6040
Non contact typedisplacement meter

20
0

10

20
30
Running time（min）

40

50

Coolant pressure ： 200k P a（2kg f/F ）Coolant temperature： 20:
Room temperature ： 20:（ Coolant amount： 15R /X ）6

Noise level

90
Noise level（dB）

POINT

80

Main spindle only（6,200rpm）

70
60
50
40

TDU17（30,000rpm）
TDU40（12,000rpm）
12
3
4
Output speed（×10 rpm）

4

18

HY-DUAL CHUCKPAT.

TOOL HOLDER FOR DIFFICULTTO MACHINE MATERIALS

POINT

1
1

POINT

2
2

Dual-clamping method
Dual chucking by Hydraulic & Mechanical
Only high rigidity & high clamping power can prevent the end mill frombeing pull-out and can prevent chattering.
SHOWA has solved the so-called "wooden pestel phenomenon"
which causes the pulling out of end mill,by clamping the cutting tool's shank nose & shank end.
"Vibration" caused by chattering is removed by the attenuation
mechanism of hydraulic and spring.

Structure
Simple chuking by a single to be made by SHOWA（Japanese andAmerican, patent acquistion finished） SHOWA present one action,easy chuking（Patent acquired in Japan and USA）.

① Thrust rilg is plled down.

Chucking tube

② At the same time,

the piston is being pressed down.

UnclampHydro③ Chucking tube shrink.

Clamp④ At the same time,

the hydraulic clamping is activated.

⑤ Clamping is complete.

19

PistonThrust ring

POINT

3
3"Wooden pestel phenomenon"
A tool, while being deformed by a bending moment in the milling process, twists in the tool holder, thedeformation occurs repeatedly by high pressure in a short stroke.(Bending moment: Bending resistance
R (N) x tool protruding amount L (m)). The mouths of both the collet and the holder will expand and wear
flare by this movement. These mouths are easily deformed by the principle of leverage, as the ratio below
is increased. L (tool protruding amount) /H (tool gripping length) The material such as steel having a lower
Young's modulus is more likely to deform than the carbide of the tool. A circumference difference[e=π(D1-D)] occurs between the tool shank and the holder mouth because of abrasion expansion.
The tool turns more than the holder and at the same time it starts pulling out little by little. In addition, debris generated in the worn area creates a rust ring and is adhered mainly to the shank. It is considered that,as measures, to reduce the bending moment is mainly common.
Headband-like rustHeadband-like rust
Straight collet

Trumpet-like wear

H

H

Trumpet-like wear

D1
L

L

D1

Bending resistance R

Bending resistance R（Feed force + Back component forceÅj）（Feed force + Back component forceÅj）

D

図1

POINT

4
4

direct chucking

図1

D

Chucking throgh collet

Machining Performance
Test cut with Hy-Dual chuck and conventional milling chuck in the same program

Comparison of surface roughness● Holder in use : BT50-HDU20-100(HY-DUAL CHUCK)

BT50-HPC20-105(MICRON CHUCK)● Cutting tool
: Six flutes Cemented carbide endmill● Work materials : SKD61● Cutting condition
Ap

Ae

Rotational speed

Feeding rate

Tool projection

30mm

1mm

1900min-1

1920mm/min

55(L/D=2.75)mm● Result: improvement of surface roughness was observed

HPC Ra=0.64μ

HDU Ra=0.360μ

DIMENSIONS

BT P.61,62 HSK P.130
20

<BORING SYSTEM>FIRSTCUT [Small-hole Boring Tool]
NEW

Precision Tuning Small-holeBoring Tool
A Higher Level of Stability
A Higher Level of Stability

Adjustment dialHigh feeding precision

Auxiliary ring
Eliminates dimension matchingerrors.

ColletAllows the operator to change thediameter of the boring bar handle.

Lock bolt
Can be locked with light force.

Throwaway jig borer tool
The tip is mounted so as to minimize cutting resistance.
Ensures that hole diameters will not diverge.

21

DIMENSIONS

BT P.72 HSK P.135 ST P.150

DIMENSIONSJIG BORER TOOLS, COLLET, INSERTS P.73, 136

DIMENSIONSEXTENSION, REDUCTION P.74, 137

High Rigidity Pre-balanced Design
Square slide, through feed screw, steel balls on bothsides of feed screw, feed screw fixed with double
screws, and backlash-adjusted internal thread: very
robust structure without any gaps.

Slide lock bolt

Square slide
Steel ball

The feed screw is polished at high precision and thus
moves smoothly, allowing for accurate dimensional
adjustment with the dial scale (backlash-free).
The dial is calibrated to 0.01 mm for FIC2NJ, 0.005 mm
for FIC1NJ.

O-ringBacklashadjustment bolt

FIC2NJ

With auxiliary ring
An auxiliary ring is placed on the outer circumference ofthe dial. Rotating this manually makes dimensional
adjustment easier and eliminates reading errors.

Standard line
Auxiliary ringThrowaway Boring Tool
We utilize our own proprietary design for our throwaway
boring tools. These tools are designed to minimize
cutting resistance and fully utilize the tip features, inorder to avoid making trumpet-shaped machined holes.
ISO tips can be used. The shank has a coolant hole thatallows the reliable supply of through coolant to the bladeedge.
The heads can be used with through coolant systems,
provided that you use our dedicated throwaway tools.

22

<BORING SYSTEM>FIRSTCUT [Machining diameter Ф25-Ф73]
NEW

Adjustable Boring for Ultra-precision Finish
Adjustable Boring System for Ultra-precision Finish
Achieved by High-precision Feeding

Maintenance HoleThe body has an opening for cleaning and filling.
Air for cleaning is injected and oil is supplied
via the maintenance hole, ensuring continuous
stable movement of the slide.

Lock bolt
Stable locking withinserted locking pad

The slight clearance between
the slide and the body hole isproperly adjusted.

23

DIMENSIONS

BT P.71 HSK P.134 ST P.150

DIMENSIONSTHROWAWAY SQUARE SHANK TOOLS, INSERTS P.73, 136

DIMENSIONSEXTENSION, REDUCTION P.74, 137

Eliminating the Staggering of Blade Edge Dimensions

Reinforced Machining Stability

The blade edge does not stagger evenwhen the slide is locked.

A guide groove on the body ensures
stable machining.

The slight clearance between the slide and the body hole isproperly adjusted. In addition, a locking pad is placed between
the lock bolt and slide, preventing torsional action on the slide attightening. Moreover, the lock is set in a slanting direction so as
to deal with both the main and feeding force components of the
cutting resistance force. These measures thus eliminate staggering of the blade edge when locking the slide.

In order for the body to securely absorb the
cutting resistance force, it is equipped witha polished guide groove to keep the blade
fixed, thus absorbing the component force
and improving machining stability.

Slide

Body

Locking pad

Slide

Lock bolt

Lock bolt

Tightening
direction

Coolant hole
Main cutting
resistanceforce component
Cutting resistancefeeding
force component

Blade

Blade
Guide groove

Body

Tip

Backlash-free Dial Calibrated to 0.01 dia.
Direct reading accuracy of 0.01 dia.

<Standard>

The dial is very easy to read because a gear is incorporated to widen the calibration pitch.
In addition, its structure eliminates backlash, thereby improving its operability.

High Feeding Precision
Accurate feeding is maintained via the high-precision feed screw.
The feed screw, an essential point of feeding precision, has been polished with highprecision after heat treatment.
For this reason, it will maintain a highly accurate feed, allowing the user to reliably correct
dimensions on the machine.

Support for through coolant
Coolant is reliably supplied to the blade edge.
Through a steady supply of coolant, chippings are easily
expelled and both the blade edge and machined area of
workpieces can be prevented from heating up. This has thefollowing benefits:❶ Improved tip lifetime❷ Higher cutting speed/cutting feed
❸ Improved surface roughness of workpieces❹ Improved dimensional accuracy of workpieces
As a result, you can expect accurate machining at highefficiency.

24

<BORING SYSTEM>FIRSTCUT [Machining diameter Φ70-Φ360]
NEW

Adjustable Boring for Ultra-precision Finish
Adjustable Boring System for Ultra-precision Finish
Achieved by High-precision Feeding

Blade edge/tip
60° Triangular tip
80° Rhomboid tip

Coolant hole/nozzle
Allows reliable feeding
to the blade edge.

Radial adjustment screw
Direct reading 0.01 dia.

Slide
Dovetail structureHigh-rigidity clamp holding type25

Tool/Blade
90° square shank tool

DIMENSIONS

BT P.71 HSK P.134 ST P.150

DIMENSIONSTHROWAWAY SQUARE SHANK TOOLS, INSERTS P.73, 136

DIMENSIONSEXTENSION, REDUCTION P.74, 137

High-rigidity clamp holding structure
Holding clamp bolt

The body and slide part are integrated with a hand-finisheddovetail that is aligned to the actual workpiece and held fixedwith clamp bolts. Since it is constrained in two places (thetaper area of the dovetail and the bottom surface) a highly rigid
assembly is ensured.

Use of Precision Screws

Two-face
constraint

FIC150N, FIC220N, FIC290N use polished worms/worm wheels,
allowing fine-tuning with a precision of 0.01 dia. by direct reading.

Wide Variety of Blade Edges
We adopt 90°square shank tool, and when choose L-type squareshank tool, then back boring is available.
We adopt ISO insert chip so according to the work you can selectfrom chips made by any tool manufacture.
※L-type square shank tool for back boring and back cover to bequoted separately.
Square shank tool type L

Back cover (option)

FIC150N、220N、290N head
Back boring machining

Wide Machining Range
By using square shank tools, wider machining range that cannot
normally be achieved with a normal boring head can be obtained
not only by moving slide but by projecting square shank tools.
Moreover, well balanced machining can be achieved by mainly
adjusting the projection of shank tool and then decreasing theslide opening for the tuning.

26

SHOWASKM TOOL SYSTEMTOOL HOLDERS
FOR MULTI-TASKING MACHINE

POINT

1
1

Features
High rigidity

SKM's hollow shank is deliberately thin and flexible, so it expands more than the socket ofspindle and tightens when rotating at high speed. As the drawbar retracts, it expands the collet
and pulls the shank back into the socket, compressing the shank until the flange seats against
the front of the socket. This provides a stiff, repeatable connection more than BT shank.
High-precision Machining

By a combination of axial clamping forces and taper-shank interference,
positiong repeatability improves highr than BT shank, enabling highprecision machining.

High Speed Machining

There is no subduction in the high-speed machining because all from holder to clamp unit are inshymmetrical shape.

End face contact

Lock rod

Steel ball27

SpindleHolderPOINT

2
2

SKM Tool line up
MICRON CHUCKEND MILL HOLDER

SKM63XMZ-EM16-60Y-D
SKM63XMZ-EM20-60Y-D
SKM63XMZ-EM25-80Y-D
SKM63XMZ-EM32-90Y-D

SKM63XMZ-HPC03H -90Y-D
SKM63XMZ-HPC04H -90Y-D
SKM63XMZ-HPC06H -90Y-D
SKM63XMZ-HPC08H -90Y-D
SKM63XMZ-HPC10H -90Y-D
SKM63XMZ-HPC12H -90Y-D
SKM63XMZ-HPC20 -90Y-D
SKM63XMZ-HPC25 -105Y-D
SKM63XMZ-HPC32 -105Y-D

MORSE TAPER HOLDERCOLLET CHUCK

SKM63XMZ-MTA1-120Y-D
SKM63XMZ-MTA2-120Y-D
SKM63XMZ-MTA3-125Y-D

FACE MILL ARBORSSKM63XMZ-ER11 -60Y-D
SKM63XMZ-ER11 -90Y-D
SKM63XMZ-ER11 -120Y-D
SKM63XMZ-ER16 -60Y-D
SKM63XMZ-ER16 -90Y-D
SKM63XMZ-ER16 -120Y-D
SKM63XMZ-ER25 -60Y-D
SKM63XMZ-ER25 -90Y-D
SKM63XMZ-ER25 -120Y-D

SKM63XMZ-ER32 -60Y-D
SKM63XMZ-ER32 -90Y-D
SKM63XMZ-ER32 -120Y-D
SKM63XMZ-ER40 -60Y-D
SKM63XMZ-ER40 -90Y-D

SKM63XMZ-FMA25.4 -45Y-D
SKM63XMZ-FMA31.75 -45Y-D
SKM63XMZ-FMC22-45Y-D
SKM63XMZ-FMC27-45Y-D
SKM63XMZ-FMC32-45Y-D28

SHOWA
D-F-C SYSTEM (BBT)

Merit with dual face contact system
Gap

Contact●Improve preciousness of processing surface anddimension●Extend life of cutting tools●Control color change(fretting) on the taper side underheavy duty processingh●Improve repetition preciousness of ATC●Stability for Z direction at the time of high-speed
precessing●Impreove of roundness of the boring processing

SHOWA
D-F-C Shank

Standard Shank
(Taper Contact Only)（BBT）

SHOWA BBT TOOL SYSTEM
Dual face require drawing allowance space for contact
BBT HOLDERBBT HOLDER
AFTER CLAMPING

BEFORE CLAMPINGSPACE【Example of BT50】

ELASTIC DEFORMATIONCONTACTBBT SPINDLEBBT HOLDER

CLAMPING

BT SPINDLEThe Showa BBTTool System offers simultaneous dual
contact between the machine spindle face and toolholder
flange face, as well as the machine spindle taper andlong toolholder taper shank.

＊BIG-PLUS system is Daishowa Seiki licensed products【Reference value】
Spindle size

Clamping force

AXIAL MOVEMENT AMOUNT＊The value of the table is for reference only
and axial movement amount depends on theclamping mechanism and spindle shape.
（The numerical values in the machining center
owned by the Company）

DIMENSIONS
29

BT P.37-92

OTHER SHANK STYLESSHOWA Tool holders are available
with most of popular shanks.

POINT

1
1

Full range of line up, small to big

POINT

Shank types and Holder

2
2

SHOWA Tooling System includes many sizes of shanks, fromsmall ones such as S20T, HSKE32, to big ones such as BT50,
HSKA100. Small shank holders with integral pull stud are also
manufactured to order.

S20T・S25T

・HPC-H Micron chuck
・RSC Collet chuck

HS63・HS100

HSKE32・HSKE40

・All type of HPC Micron chuck
・RSC Collet chuck

・HPC-H Micron chuck
・RSC Collet chuck＊Please refer to our distributor, or to us for details.

30

NEW SUPER DRILL

Deep boring up to 15 times diameter !

High Reliability and Proven PerformanceSUPER DRILL was put on the market by SHOWA TOOL CO.
Since that time, it was continuously improved through in-the-field experiences.
In responce to customer's demands, NEW SUPER DRILL has been developed
to increase its flexibility, employing a modular system. The basic set consistsof a head and a shank. And, extension arbors are added for deeper holes.
SUPER DRILL's ease-of-use is further enhanced by this modular construction.

POINT

1
1

Single Pass, precision boring of 50mm-270mm diameters

POINT

2
2

Specialty of deep hole drilling

POINT

Able to drill even in hard metals

3
3

31

No center drilling or pilot hole required. Super Drill's
built-in center drill acts as an axis for precision drilling.
New Super drill is available in 10 standard head sizes,
A1S-55, A2-65, B-80, C-100, D-120, E-150, F-180, G-210,
H-240 and I-270, for drilling 50mm to 270mm diameters.

Combination of roughing and finishing blades form small
chips, providing efficient chip removal. No pecking or
dwelling required, even for deep holes.

New Super Drill cutting blades are manufactured fromsintered HSS, providing excellent drilling performanceeven in hard metals.

POINT

4
4

Reusable blades and center drill
The cutting edge of New Super Drill consists of a center drill,a roughing (R) blade and a finishing(S) blade. Different diameter ofholes can be bored by changing blades within the capacity of eachdrill holder. The blades and center drill can be resharpened which
reduces tool cost.

Re-sharpening fixture

A pair of roughing and finishing blades, can be
resharpened utilizing the resharpening fixture on thesurface grinder.

T/C Guides(for through hole)

In case of through hole drilling, the drill may vibrate
immediately before breaking through, depending
on hole diameter, cutting speed and feed rate, andrigidity of the machine spindle. This can result indamage of the cuttingblades. Using T/C guides whenboring through holes will minimize vibration and help
prevent tool damage.

Oil ring

Oil ring is used to supply coolant through the drill inrotational applications.

Sharpening the blades①"R" and "S blades are ground to the same height.
② Both blades are ground in straight line.
making first and second clearance.
③ Grind the center drill to the point angle of140° with thinning.

DIMENSIONS

Cutting tool P.165-174
32

POINT

5
5

Easy Assembly, Flexible for Various Applications

Morse taper shank (Standard)Standard head

Extension arbor

Morse taper shank（for oil hole holder）

Flat head

Straight shank（for milling chuck）

Straight shank（for turret lathe）

POINT

6
6

Assembly
New Super Drill's cutting edge consists of three cutters a roughing(R) blade, a finishing(S) blade and a center drill. This combinationof cutters gives outstanding drilling efficiency.
■ Procedure① Insert the center drill in the center of the head.
.
② Clamp the roughing(R) blade in the seat marked with
The inside edge of the roughing blade must contact tightly
against the side slot of the center drill, to prevent the center
drill turning free.
③ Clamp the finishing(S) blade in the seat marked S.
④ Finaly, tighten the center drill setting screw.

33

Guide Values for New Super Drill
Speed (min-1) Feed (mm/rev.)

DIN
Material USA

42CrMo4JIS

SCM440S35C-55C

Dia.

Speed

Speed

Feed

Speed

50-60

160-180 0.1 160-180 0.1 190-210 0.1 210-240 0.1
0.15
150-160 0.15 170-190 0.15 190-210 0.18
140-160

80-90

70-80

60-70

80-85

55-70

70-80

110-140120-140

155-170

170-190

70-80

80-90

100-120110-120140-155

155-170

60-70

0.08

45-50

0.06

90-10090-110100-110125-140140-155

55-60

0.15

40-50

0.1

80-90

CK35-55

ST

4140

Feed

0.1
0.18

Feed

ALUMINUM

1025

D

W1-10

D2

40-50

S25C

SS

SK3

SKD11

FC25-40

Speed

Feed

0.1

Speed

Feed

Speed

Feed

50-55

Speed

SUS27

Feed

Speed

Feed

140-150 0.15
120-140 0.25

75-90
60-75

0.06 450-500 0.15
0.12 400-450 0.25

100-12055-70

350-400

90-100

50-60

0.15

0.06

45-50

Speed

300-350
300-330

Feed

0.15

100-11080-10090-100110-125 0.18 130-140

50-55

35-40

70-80

40-45

0.13 280-300 0.35

110-120

70-90

80-90

100-110120-130

45-50

30-35

65-70

35-40

250-290120-130

70-80

70-80

90-100105-120

40-45

30-35

60-65

30-35

230-250130-140

65-70

65-70

80-90

90-100

35-40

25-30

50-60

25-30

200-230140-150

50-60

50-60

75-80

80-90

30-35

25-30

40-50

20-30

180-200

150-160

50-60

50-60

70-75

75-85

25-35

20-25

35-45

20-25

170-180

160-170

50-60

50-60

65-70

70-80

25-30

20-25

35-45

15-25

160-170

170-180

45-50

45-50

60-65

65-75

25-30

20-25

35-40

15-25

150-160

180-190

45-50

45-50

60-65

60-70

20-30

20-25

30-40

15-25

140-150

190-200

40-45

0.06

45-50

55-60

0.06

60-65

20-25

0.06

15-20

0.05

30-40

0.10

15-20

0.06 135-140 0.15

200-210

40-45

0.15

40-45

55-60

0.16

55-65

20-25

0.15

15-20

0.1

30-35

0.25

10-20

0.12 130-135 0.2

210-220

40-45

40-45

50-55

55-60

15-25

15-20

25-35

10-20

120-130220-230

35-40

40-45

50-55

50-60

15-20

15-20

25-35

10-20

115-120230-240

35-40

35-40

45-50

50-55

15-20

15-20

25-30

10-20

110-115240-250

30-35

35-40

45-50

45-55

15-20

15-20

25-30

10-20

105-110250-260

30-35

30-35

45-50

45-50

15-20

15-20

20-25

10-20

100-110260-270

30-35

30-35

40-45

40-50

15-20

10-15

20-25

10-15

100-110

0.06
0.12

0.1
0.15

0.35

NOTE : Reduce drill speed by 30%～50% in case of quenched and tempered Chromoly,
structural steel, etc. depending on their hardness.

New Super Drill Drilling Data
Material
Cut.speed
Feed

Nominal
Dia.
(mm)

Speed
(min-1)Item

A1-50～55
A2-55～65
B-65～80
C-80～100

D-100～120

E-120～150

F-150～180

50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180

127
116
106
98
91
85
80
75
71
67
64
61
58
55
53
51
49
47
45
44
42
41
40
39
37
36
35

S50C
20m/min
0.15

Material
Cut.speed
Feed

NominalCut.torque(kN･m)

Cut.power(kW)

Thrust force
(kN)

0.17
0.20
0.23
0.26
0.30
0.33
0.37
0.41
0.46
0.50
0.55
0.60
0.64
0.70
0.75
0.80
0.86
0.92
0.97
1.03
1.10
1.16
1.22
1.29
1.36
1.43
1.50

2.2
2.3
2.5
2.6
2.8
2.9
3.1
3.2
3.4
3.5
3.6
3.8
3.9
4.0
4.2
4.3
4.4
4.6
4.7
4.8
4.9
5.0
5.2
5.3
5.4
5.5
5.6

4.8
5.2
5.6
6.0
6.4
6.8
7.2
7.5
7.9
8.3
8.6
9.0
9.3
9.7
10.0
10.4
10.7
11.1
11.4
11.8
12.1
12.4
12.8
13.1
13.4
13.7
14.1

Dia.
(mm)

Speed
(min-1)

185
190
195
200
205
210
215
220
225
230
235
240
245
250
255
260
265
270

34
34
33
32
31
30
30
29
28
28
27
27
26
25
25
24
24
24

Item

G-180～210

H-210～240

I-240～270

S50C
20m/min
0.15

Cut.torque(kN･m)

Cut.power(kW)

Thrust force
(kN)

1.57
1.64
1.72
1.79
1.87
1.95
2.03
2.11
2.19
2.28
2.36
2.45
2.54
2.63
2.72
2.81
2.90
3.00

5.8
5.9
6.0
6.1
6.2
6.3
6.4
6.5
6.7
6.8
6.9
7.0
7.1
7.2
7.3
7.4
7.5
7.6

14.4
14.7
15.1
15.4
15.7
16.0
16.3
16.6
17.0
17.3
17.6
17.9
18.2
18.5
18.8
19.1
19.4
19.7

NOTE : The above values are not ones measured in actual drilling. It is recommended to use
New Super Drill on a machine having 50% or more bigger capacity than thesevalues for efficient drilling.

34