Information presented in this brochure is subject to change without prior notice.Available machines or machines shown may vary depending on optional equipment or periodic design changes.The export of products defined as restricted commodities (or technologies) under Japan's "Foreign Exchange and Foreign Trade Act" requires an export license issued by the Japanese Government. Furthermore, similar licenses may be required for re-transfer, re-sale or re-export of such products, therefore please do not fail to contact JTEKT in advance. In order to observe laws and regulations and prevent inappropriate export, re-sale and relocation, JTEKT has equipped all of our NC machine tools with devices that detect relocation. If this device is activated, the machine will cease operation and will not restart until it has been checked by JTEKT. JTEKT may refuse to restart the machine should it be deemed that such an action would amount to the inappropriate export of a commodity or technology, or violate export regulations. In such a case, JTEKT will not be liable for any damages arising from the refusal to restart machine operation and do not bear any liability to perform services pertaining to product warranty.Please contact your JTEKT representative for details. Always read manuals carefully before using any machinery to ensure safe and proper use.

Type of Machinery:Grinder Model Number: GC20Mi©JTEKT CORPORATION 2013Cat. No. M21113E Printed in Japan 131101U

This publication was made using recycled paper for the protection of forests.

CBN Camshaft Grinders

CBN Camshaft Grinders

U.S.Patent on the Machine:4,963,805 and othersThe grinder in the photo is a GC20Mi-63.The grinder in this photo has special specifications.Note : Painting color shall be specified by mutual agreement.

● High-accuracy grinding promising a high accuracy grinding surface.● High-rigidity bed reducing thermal displacement and improving chattering accuracy.

Latest camshaft grinders with linear motor drive.

High-accuracy

● Improved reliability with TOYOPUC-GC70. ● Simplification of wheel replacement.

● Achieving high-speed grinding of difficult-to-cut material.● Reduction of set-up changeover time.

Improvement of productivity

Reassuring operation

Cam shaft for automotive engines

Grinding result

FCD700120m/s4mm

MaterialWheel surface speedStock removal

Actual grinding timeProfile accuracySurface roughness

12s/2cam+5μm～ -1μm1.6 ｍＲｚ

Profile accuracy　　+5μm～ -1μm Surface roughness　　1.6 ｍＲｚ

20 m20 m

2.5 ｍ

2.5 ｍ

01 02

High-rigidity bed reducing thermal displacement and improving chattering accuracy.

50%

● High-response wheelhead feed mechanism　　　● High-response servo system

Reliable and high accuracy High accuracy grinding promising a high quality grinding surface.

Quick-response wheelhead feed mechanism adopting light-weighted wheelhead, static pressure slide way and linear motor drive achieves the wheelhead feed having almost free from lost-motion and backlash.The newly developed high response servo system and high response feed mechanism enhance the accuracy and quality of pin and journal grinding surface

Reduced thermal displacement between wheel and center through optimized rib arrangement and heatproof material as a result of bed thermal analysis.

Avoid resonance caused by wheel rotation frequency through bed eigenvalue analysis.

Difference in relative displacement between headstock and tailstock.

High-accuracy

Stable high-grade grinding

（when φ350mm, 120m/s）

55% reduction

Conventional GC20Mｉ

Thermal displacement between wheel and center

Conventional GC20Mｉ

SERCOS*

CNC

High-response wheelhead feed High-response servo system

Linear scale

Linear motor

Servo amplifier

Hydrostatic slide

Grinding wheelWorkpiece

Workhead

TOYOPUC-GC70

＊ A registered trademark of SERCOS International e.V.

reduction

g espo se ee ead eed

78% reduction0.5

1

0Following error between

no-load and grinding states

Static pressure screw feed Linear motor feed

（Index） Following capability improved with linear motor feed.

Compared with a static thread feeder, wheelhead feed (X axis) following accuracy has improved 4 times.

Profile accuracy＊ Example of eccentric circle grinding. The result differs depending on profile.

2020μｍ20μｍ

g p y

75% reduction2

4

0Following accuracy

Static pressure screw feed Linear motor feed

（Index） Following capability improved with high gain servo.

3-point support bed

● Illustration of 3D design development model ● 3-point support bed

By adopting the 3-point support system, changes in the bed support rigidity caused by changes in the ground surface is minimal, making long-term, stable grinding accuracy possible

Sensor thermal displacement compensation

Thermal displacement compensation by sensor yes

Spec ±0.04mmDatum dimension

15min※Headstock

Weelhead

Footstock

■ Eddy current type gap sensor

■Measuring block

Indexes to the datum position and measures thermal displacement by measuring this dimension.

Conventional Time required for warm-up operation

Thermal displacement compensation by sensor no

The thermal displacement caused by the difference in machine temperature between the previous day and the morning of the current day is compensated with a sensor, reducing warm-up cycle time. A long-term stable machining accuracy can be maintained.

Equipped with the extremely rigid hybrid-type TOYODA STAT BEARING which provides no metal-to-metal contact and has a high vibration damping capacity, this grinder assures high accuracy and a long service life.High accuracy grinding and longevity of the machine is achieved by using proven JTEKT spindle technology.

Featuring the JTEKT original TOYODA STAT BEARING as the wheel spindle, the heart of the machine

Pressure from pump

Hydrostatic pressure

Pressure from pump

Hydrostatic pressure

Hydrodynamicpressure

■Spindle at restHydrostatic pressure lifts and holdsthe wheel spindle firmlyat the bearing center position.

■Rotation spindleCombination of hydrostatic and hydrodynamicpressures improves spindle rigidityand vibration absorbing performance.

Grindingforce

03 04

High-accuracyPlatformPlatformHigh-accuracy

Realizes high-speed machining of the material being difficult to machine

Keep the grinding removal amount per one rotation of the cam by adoption of work spindle stepless speed control to the best level. Therefore, the leveling of grinding resistance can be done and improvement of profile accuracy and shortening of cycle time can be done at same time.

Improvement of productivity

Directly detects contact between the wheel and diamond roll and cuts in a certain amount from that position, therefore the truing amount is optimal and a stable cut is achieved each time truing is performed.

Safety automatic position memory

Run-out removal, truing, position memory and so on is performed automatically after wheel replacement making work easy and alleviating the workload.

Direct detection type truing system

Reduction of set-up changeover time

We also have set-up changeover items prepared which can respond to workpieces with difference lengths and diameters. This significantly reduces set-up changeover time, contributing to productivity improvement.

●Difference in journal position・Rest traverse specification

●Difference in journal diameter・Supports rest automatic diameter difference

NC spindle movement function

CBN wheel

Truing roll

NC automaticdistance adjustment between centers

Workhead

Workhead

Footstock

Footstock

●Difference in workpiece length　　・Live spindle workhead with NC spindle movement function・Tailstock with NC automatic distance adjustment between centers

●Difference in workpiece length　　・Live spindle workhead with NC spindle movement function・Tailstock with NC automatic distance adjustment between centers

180°

0°

θ

270° 90°

Cam0° 90°

Conventional grinderGCS

GC20Mi

180° 270°

0° 90° 180° 270°

Grinding removal rate

Grinding removal rate

Work spindle

rotation speed

Work spindle

rotation speed

Time

Time25%Reduced*

One rotation of cam

One rotation of cam

360°360°360°

※ Grinding removal rate ＝ Grinding removal efficiency per angle unit　　＊ Result differs depending on profile.

360°360°360°

05 06

Reduction of grinding time & non-grinding time.

Improvement of productivity Details of functions Improvement of productivityDetails of functions

Interference Range

Inching / Handle Mode Axis in motion

Workpiece Workpiece

Retraction of grinding wheelhead

Displays motion direction before operation

Shows motion direction in color

Reassuring operation

Improved reliability with TOYOPUC-GC70.

Stable operation at first-piece grinding and handle operation.

At first-piece automatic grinding and handle operation after set-up changeover, speed is limited within preset interference zones so operations can be performed with reassurance.

Prevention of incorrect manual operation

The GF50Mi Series is equipped with a support function which displays motion direction and notifies the operator of incorrect operations, in order to avoid interference by erroneous operation direction.

Protection against grinding wheel damage during power failure

The grinding wheel is separated from the workpiece if a power failure is detected, thereby protecting against grinding wheel damage.

Letter display

Screen in operation status

Icon display

Iconized operation buttons

Operations can be easily recognized through iconized operation buttons. Buttons can be switched from icons to letters.

Position memory screen

Perfected guidance function

Setup change, maintenance details, input data explanation, etc. can be easily understood from the graphical operation screen, and operations can be carried out smoothly.

Fault lamp Fault display Circuit monitor

Fault occurrence

Simple fault diagnostics

Fault locations are diagnosed directly on the CNC screen from the error display and the circuit monitor.

Perfected preventative maintenance support function

Defective workpieces and machine malfunctions can be discovered early by comparing normal values sampled from electrical current, position deviations, speed data, etc.

Data batch backup function

Allows the batch saving of all data, including grinding conditions, compensation data, parameters, etc. This function can also be of use in fault analysis of machine stoppage.

The intelligent-oriented functions simplify the job and ensure higher accuracy

● Various functions ensure accuracy become standard accessories.

Functions to ensure accuracy such as the F.B. error data smoothing function, the cam lift data smoothing function, the measurement error compensation function and the cam processing analysis function become standard accessories.

Setup of automatic work spindle rotation speed

Wheelhead

FootstockWorkhead

At unanticipated power failure due to lightening, etc.

During grinding

Grinding wheel

Grinding wheel

07 08

Reassuring operation Details of functions Reassuring operationDetails of functions

Reassuring operation

Best design limiting coolant splash range

Reduction in power consumption per workpiece.

Rear side

A local cover concept is used to limit the coolant splash range, and the tailstock and wheelhead, where motors, pressure switches and other electronic devices are concentrated, have been located outside the coolant splash range

An excellent machine configuration for coolant collection.

Designed with optimum slope and a coolant collection route structure that does not disturb chip flow. This has improved coolant flow, reduced chip accumulation and contributed to the shortening of cleaning time.

Centralized arrangement of devices considering workability.

Maintainability has been improved through centralized arrangement of the coolant device panel and the pneumatic device panel.

Simplification of wheel replacement.

Improved proximity to wheel at wheel replacement and adopted a slide method for the upper cover on the wheel replacement side, improving workability.

Reduced power consumption by 13% of conventional grinder GC20M and 27% of conventional grinder GCS through the following measures: － Adopting an energy-saving pump－ Eliminating the circulating filter circuit pump by improving cleaning level － Shortening warm-up operation through a low thermal displacement bed－ Shortening cycle-time by a wheel with high grinding efficiency and improved sharpness

Wheel - bed end distance 50% reduction

Conventional

660

320

GC20Mｉ

Conventional grinder（GCS）

（index）

（mm）

10084

Conventional grinder（GC20M）

GC20Mi

27%

73

Annual pow

er consumption

Vertical cover preventing coolant splash Front side

09 10

Reassuring operation Details of functions Reassuring operationDetails of functions

Machine Specifications

TOYOPUC®-GC70 CNC specifications

GC20Mi　Recommended package accessory list

Item No. Recommended package accessories

Standard accessories

■Supports one type of workpiece　■Center distance 630mm　■Live spindle workhead (without NC spindle movement function)　■Hydraulic type tailstock (hydraulic stroke: 60mm)　■Carbide tipped center (one each for right and left)　■Wheelspindle (φ350mm)　■Wheel peripheral speed (22kW, 120m/s)■Automatic open/close cover ■Duct opening for dust collector　■Machine transplant detection　■Circular coolant tank (tank capacity 720L) (accessories: magnetic separator (processing capacity: 360L/min), cooler for coolant temperature adjustment) ■Manually tightened drive bracket ■200V power voltage■Japanese nameplates　■Standard paint color (dark grey/silver metallic)　■Instruction manual 1 set (hardcopy)　■Control cabinet cooler　■100V power outlet

Item ItemDivision

Automaticam profileprogrammingfunction

Camgrindingfunction

Others

Wheel truing cycle time ●

Lift data input/output ●

Cam parameter data input/output ●

NC profile data computing ●

Lift input data editing ●

Speed/acceleration data display ●

Override data smoothing function ●

Steps infeed ●

Optional phase angle grinding start ●

Work spindle rotation control ●

Work spindle rotation control command unit 1% ●

F.B. error data smoothing function ●

Measurement error compensation function ●

Manual pulse generator ●

MDI on/off key switch ●

USB flash drive I/F ●

Automatic workpiece data processing changeover □

Cam processing analysis function ●

Host computer connection □

Wheelhead return at power failure □

Cam lift data smoothing function ●

Processing cycle time ●

Grinding cycle time ●

Canned cycle ●

Test cycle ●

Return cycle ●

Single block ●

Rapid feed override ●

Valid handle operation during profile cycle ●

Wheel replacement prediction/min.wheel dia. displa ●

Truing roll replacement prediction/Wheel minimum diameter display ●

Contact detection pin replacement prediction/Wheel minimum diameter display ●

Self-diagnosis function ●

Alarm history display ●

Production maintenance data output ●

Batch backup function ●

Servo sampling function ●

Production counter ●

Wheel truing counter ●

Quality check counter □

Item

Cycletimedisplay

Sequence circuit monitor edit ●

In-process startup function ●Operation

Maintenance

Counter

Division

Filemanagement

Division

Display

Controlledaxes

Coordinatesetting

Compensationfunction

●X ： Wheelhead feed

●Z ： Wheelhead traverse

□WF ： Footstock quill stroke

□WW： Work spindle stroke

●Structured data management

●Lift data memory ： 500

●Maximum of 64 grinding data

●Process data / each workpiece ： 30

●compensation

●Step difference compensation

●Operation monitor

●Manual operation switches and lamps

●Work procedure

●Inspection,Maintenance data

●C ： Work spindle rotation

●Display unit 12 inch color TFT

●NC profile data

●Lift input data

●Position memory(Wheel OD,Truing roll outside diameter,Detection pin length)

●Wheel wear compensation

ItemItem

OD

Maximum width

Surface speed

Feed method

Feed method

Type

Center

Rapid feedrate

Minimum input increment

Rapid feedrate

Minimum input increment

Maximum spindle speed

Distance between centers

Center height

Grinding diameter

CBN wheel

Wheelhead

Wheelheadtraverse

Workhead

Swing over table

Drive motor

Footstock

Power supply voltage

Machine weight

Tankcapacity

Workhead

Spindle

Truing roll

Type

Center

Hydraulic stroke

Wheel spindle

Wheelhead feed

Wheelhead traverse feed

Wheel spindle bearing oil pump

Lubricating oil

Hydraulic oil pump

Lubricating oil pump

Spindle bearing lubricant

Hydraulic oil

Minimum input increment

GC20Mi-35/63

350／630

1,120

φ10～φ300

φ350 ［ φ100、φ150 ］

20

［φ100 wheel：60］

［φ150 wheel：80］

φ350 wheel：120［ 80 ］

Hydrostatic slideway. Linear motor drive

V-slideway, Ball screw drive

Live spindle

MT No.4

φ40

φ0.0001

20

0.0001

250

φ320

2.5

0.75（2P）

GC20Mi-35/63

Hydraulic

MT No.4

60

22［ 30 ］

9.8

2.9

3.7（4P）

200

40

11,000

0.75（4P）

0.4（4P）

70

25

0.0001

Unit

mm

mm

mm

mm

mm

m/s

m/min

mm

m/min

mm

min-1

mm

kW

kW

Unit

mm

kW

kW

kW

kW

V

L

kg

kW

kW

L

L

°

Packagedesignationoption

Recommendedpackage options

Select option

Additionaloption

WorkheadFootstockTruing deviceWheel peripheral speed specificationsWorkpiece rotation fault confirmation unit

Electrical control

Coolant tank

Steady rest

Drive unit

Coolant tank

Steady rest

Drive unit

Wheel peripheral speed specifications

Electrical control

Nameplates

Paint

Wheelspindle rotation fault and stop confirmation unit

Hydraulic-related

Wheel balance unit

Tools

Jig craneWorkpiece temporary supportDust collector

Submitted documentation

Rotating headstock with NC spindle travel function （MT No.4, NC process: 100mm） Tailstock with NC automatic center adjustment （MT No.4, NC process: 190mm） Truing device with built-in AE sensor30kW, 120m/s Workpiece rotation fault （proximity type）Thermal displacement compensationElectric-saving circuitWarm-up operation circuitGC70 grinding status display

High cleaning level coolant tank2 rests （2 rest shoes） 3 hydraulic rests （3 rest shoes） Collet chuck

High cleaning level coolant tankCentralized coolant processing（Standard） round coolant tankRound coolant tank （accessories:: magnetic separator （processing ability of 360L/min）, cooling equipment for coolant temperature adjustment, SPICLON） 2 rests （2 rest shoes） 3 hydraulic rests （3 rest shoes） Auto rest （Made by Arobotech） GR-3520V-NX （φ20mm to φ35mm）Collet chuckManually tightened drive bracketCollet chuck with shift functionKey extracting unit （for collet chuck key groove method）（Standard） 22kW, 120m/s22kW, 80m/s 30kW, 120m/s 30kW, 80m/s（Standard） 200V power voltage380V, 400V, 415V power voltages（Standard） Japanese EnglishChinese（Standard） JTEKT standard colorDesignated color

Wheelspindle rotation fault and stop confirmation unit （proximity method）Application of Fire Service Act to pump unit （submission of manufacturer's autonomous examination）Air gunCoolant splash gun （for cleaning）Wheel balancing unit - MarposStandard toolsWheel hoisting bracketJig craneWorkpiece temporary supportDust collector CRD-750Instruction manual （on CD） Instruction manual Additional submission （1 copy）

○○○○□□□□□

○○○○

○○●

○

○○

○

○●○○●○○○●○●○○●○

□□□□□□□□□□□□

123456789

1234

123

4

56

7

8910111213141516171819202122

123456789101112

Division

［　］: option

※ The specification may be restrained according to the accessories and the tooling of customer.

●: Standard　□: Optional

Sizing Sizing grinding cycle □

●： Standard accessory　○： Optional A accessory　□： Optional B accessory＊ When an optional A accessory is chosen, the corresponding standard one is not supplied.

11 12

AccessoriesSpecificationsMachine Specifications / CNC specifications Specifications

The grinder in this image has standard cover specifications.

4,955

1,720

1,120

2,250

Ｒ600

Ｒ800

2,775

Ｒ704

227

2,540

710

690

NAGOYA HEAD OFFICENo. 7-1, Meieki 4-chome, Nakamura-ku, Nagoya, Aichi Pref., 450-8515, JAPAN　TEL: （81）52-527-1900　FAX: （81）52-527-1911

OSAKA HEAD OFFICENo. 5-8, Minamisemba 3-chome, Chuo-ku, Osaka, 542-8502, JAPAN　TEL: （81）6-6271-8451　FAX: （81）6-6245-3712

SALES & MARKETING HEADQUARTERSNo. 5-8, Minamisemba 3-chome, Chuo-ku, Osaka, 542-8502, JAPAN　TEL: （81）6-6245-6087　FAX: （81）6-6244-9007

－ GLOBAL NETWORK －MACHINE TOOLS & MECHATRONICS BUSINESS OPERATIONS

MACHINE TOOLS & MECHATRONICS OVERSEAS SALES DEPT.1, Asahimachi 1-chome, Kariya, Aichi Pref., 448-8652, JAPANTEL: （81）566-25-5171　FAX: （81）566-25-5467

OVERSEAS AFFILIATED COMPANIES

TOYODA MACHINERY USA CORP.HEADQUARTERS316 W.University Drive, Arlington Heights, IL 60004U.S.A.TEL: （1）847-253-0340FAX: （1）847-577-4680

TOYODA MACHINERY USA CORP.AUTOMOTIVE PRODUCTS & SPECIALMACHINES DIVISION51300 W. Pontiac TrailWixom, MI. 48393-1003U.S.A.TEL: （1）248-624-5755FAX: （1）248-624-8597

TOYODA MACHINERY AND ENGINEERING EUROPE SAS2 Grande Allee P.A des Petits Carreaux 94380 Bonneuil sur Marne, FRANCETEL: （33）1-49.56.85.80FAX: （33）1-43.77.47.50

TOYODA MACHINERY EUROPE GmbHHEADQUARTERS Bischofstr, 118 47809 Krefeld GERMANYTEL: （49）2151-5188-300FAX: （49）2151-5188-333

TOYODA MACHINERY （DALIAN） CO., LTD.HEADQUARTERS46 Developing Zone In DaLian, 116600 ChinaDalian, CHINATEL: （86）-411-8733-4601FAX: （86）-411-8733-4602

TOYODA MACHINERY （DALIAN）CO., LTD.BEIJING OFFICERoom 1017, Fortune Building No.5 Dong San Huan North Road Chaoyang, Beijing, 100004 CHINATEL: （86）-10-6590-9356～58FAX: （86）-10-6590-9359

TOYODA MACHINERY （DALIAN）CO., LTD.SHANGHAI OFFICERoom 25B3, V-Capital Building 333 Xianxia Road Changning District, Shanghai, 200336 CHINATEL: （86）-21-5178-1088FAX: （86）-21-5178-1099

TOYODA MACHINERY （DALIAN）CO., LTD.FOSHAN OFFICE2 Wushaxinhui Road, Daliang Street Shunde District, Foshan, Guangdong, 52833 CHINATEL: （86）-757-2232-6651～52FAX: （86）-757-2232-6650

TOYODA MACHINERY （DALIAN）CO., LTD.CHONGQING OFFICE701 Lanmei Dadao（Lanmei Averue）Hi-Tech Zone, Chongqing, 400039 CHINATEL: （86）-23-6171-1133FAX: （86）-23-6171-1133

TPA ENGINEERING CORP.84BL-19Lot,Namdong Industrial Complex,675-18, Gojan-Dong, Namdong-ku,Incheon, KOREATEL: （82）-032-822-0305FAX: （82）-032-822-0306

TOYODA MACHINERY S.E. ASIA CO., LTD.313, Bangna-Trad Road, KM.1 Kwang Bangna, Khet Bangna, Bangkok, 10260 THAILANDTEL: （66-2）361-8250～1FAX: （66-2）361-8252

PT.JTEKT INDONESIAMM2100 Industrial Town Jl. Halmahera Block DD-3Cikarang Barat, Bekasi 17520 INDONESIATEL: （62）21-8998 3275 FAX: （62）21-8998 3274

TOYODA KOKI DO BRASIL INDUSTRIAE COMERCIO DE MAQUINAS, LTDA.Rua Rego Barros 1319,Vila Antonieta,Sao Paulo-SP, BRASILTEL: （55）11-6724-5711FAX: （55）11-6727-3450

TOYODA MICROMATIC MACHINERY INDIA LIMITED Plot No.550-E, 2nd FloorPlace City-II, Sector-37, Gurgaon 122 001 INDIA TEL: （91）-124-4264601/02/03 FAX: （91）-124-4288355

13 14

Machine layout & dimensions

Machine layout Specifications