Kitagawa GT User manual

Original instructions
NC Rotary Table
INSTRUCTION MANUAL
Model：GT
KITAGAWA IRON WORKS CO., LTD. MA0638EHG1
・This instruction manual is for production engineers and maintenance
personnel in charge of operation of this product. When a beginner uses
this product, receive instructions from experienced personnel, the
distributor or our company.
・Before installing, operating or maintaining this equipment, carefully
read this manual and the safety labels attached to the equipment.
Failure to follow these instructions and safety precautions could result
in serious injury, death, or property damage.
・Store this manual near equipment for future reference.
・If any questions related to safety arise about this manual, please
confirm them with the distributor or our company.
DANGER

NOTICE
Thank you for choosing the Kitagawa NC Rotary Table.
Kitagawa，a world-renowned precision equipment manufacturer, has developed the finest
quality NC Rotary Table with emphasis in high precision and rigidity as its basic principals in
design.
This unit is installed on the machining centers and suitable for indexing the angle of
machining position of the workpieces. Please contact us if it is used for any other
applications.
This NC Rotary Table has been designed to provide years of high precision performance. To
ensure optimum and trouble-free performance, please read this operation manual carefully
before using the unit and retain this copy for your future reference.
Please pay close attention to the procedures with the following warning marks to avoid
severe injury and/or accident.
Safety Alert Symbol
This is the industry “ Safety Alert Symbol ”. This symbol is used to call your attention to items
or operations that could be dangerous to you or other persons using this equipment.
Please read these massages and follow these instructions carefully. It is essential that you
read the instructions and safety regulations before you attempt to assemble or use this unit.
Indicates an Imminently hazardous situation which,
If not avoided, will result in death or serious injury.
Indicates a potentially hazardous situation which, if
not avoided, could result in death or serious injury.
Indicates a potentially hazardous situation which, if
not avoided, may result in minor or moderate injury.
Instructions for table performance and avoiding
errors or mistakes.
DANGER
WARNING
CAUTION

EC DECLARATION OF CONFORMITY
We hereby declare that the following our product conforms with the essential health and
safety requirements of EC Directives.
Product : NC ROTARY TABLE
Type : MR Series, MRT Series ,GT Series, MX Series,
TMX Series, THX Series, TRX Series, TLX Series,
TBX Series, TUX Series, TR Series, TL Series,
TP Series, LR Series TM Series, TH Series,
TT Series, TW Series, DM Series
Directives : Machinery Directive 2006/42/EC
EMC Directive 2004/108/EC
The above product has been evaluated for conformity with above directives using the
following European standards.
Machinery Directive:
EN ISO 12100-1:2003+A1:2009, EN ISO 12100-2:2003+A1:2009,
EN ISO 14121-1:2007, EN 60204-1: 2006+A1:2009, others
EMC Directive:
Emissoion : EN 55011+A2:2007
Immunity : EN 61000-6-2:2005

CONTENTS
Page
1.
For Your Safety ･････････････････････････････････・・・・・・･･･････・・・・・・・・・・
1
2.
Specifications ･････････････････････････････････････････････････・・・・・・・・・・
8
3.
Accuracy Standard ･････････････････････････････････････････････・・・・・・・・・
10
4.
Operation Ready ･････････････････････････････・････････････････・・・・・・・・・
11
4-1. Table transfer and mounting to machine tool
4-2. Oiling
4-3. Required lubrication Oil volume
4-4. Recommended Lubricating Oil.
4-5. Safety of Oil and Antirust Oil Used for the Unit
5.
Inspection ･････････････････････････････････････････････････・・・・・・・・・・・・・
15
6.
Use of NC Rotary Table ･･････････････････････････････・・・・・・・・・・・・・・・・・・
15
7.
Table Clamp ･･････････････････････････・・・・・・・・・・・・･･･････････・・・・・・・・・・
16
7-1. Precautions for table clamp
7-2. Supply of pneumatic for clamp
7-3. Air purge
7-4. Manually-releasing method of clamp
7-5. Checking device for CLAMP/UNCLAMP
7-6. Solenoid Valve for CLAMP/UNCLAMP
7-7. Replacement of excitation CLAMP/UNCLAMP of solenoid valve
8.
Mounting the Workpiece ････････････････････････････････････・・・・・・・・・・・・
20
9.
Maintenance Work ･･････････････････････････････････・・・・・・・・・････・・・・・・
21
9-1. Corrective Action in Case of Failure, and Disassembly
9-2. Before Performing Maintenance Work
10.
Backlash Adjustment of Worm Gears ･･･・・・・･･････・・・・・・・・・・・・・・・・・・・・・
22
10-1. Backlash measuring method of worm gear
10-2. Backlash adjusting method of worm gear
11.
ZRN( Zero Return ) device ･･････････････････････････・･･･････・・・・・・・・・・・・
26
11-1. ZRN device on table
11-2. ZRN device Adjustment
11-3. Sensor Mechanism
12.
Motor Case ･・･･････････････････････････････････････････････・・・・・・・・・・・・・
28
12-1. To remove motor case
12-2. Countermeasures for waterproofing

Page
13.
Troubleshooting ･･････････････････････････････････････・・・・・・・・・・・・・・・・・・
30
14.
Parts List ･･････････････････････････････････････････・・・・・・・・・・・・・・・・・・・・
33
15.
Storage ･･････････････････････････････････････････････････････・・・・・・・・・・・
38
16.
Disposal of NC Rotary Table･･･････････････････････････････・・・・・・・・・・・・・・
38
17.
Conversion of Arc Length and Angle ･････････････････････････・・・・・・・・・・・
39
18.
Mounting Rotary Joint (Option) ･････････････････････････････・・・・・・・・・・・・・
40
18-1. Alignment of discharge opening face
18-2. Pining to supply part
Appendixes
Appendix 1 Outside View
Appendix 2 Wiring Diagram
Appendix 3 Details of Nameplate

1
1. For Your Safety
Basic Safety Tips
Please read this manual and follow instructions carefully.
We cannot assume responsibility for damage or accidents caused by misuse of the NC
Rotary indexing tables, through non-compliance with the safety instructions.
Turn off the main power of the machine prior to maintenance, check, or repair of
the unit, Failure to do so may cause severe injury and/or accident.
ON
OFF
OFF
DANGER

2
Tighten the bolts securely when mounting the unit on the machine table.
Please refer to the chart below for the recommended
tightening torque of the bolts.
Strength Dimension : 10.9
Hex. Bolt Size
Torque N・m
M10
49.9
M12
86.2
M16
214.6
M20
421.4
Make sure the working area is clear of any foreign object and/or hand when the
unit is in operation to avoid any serious accident and/or injury.
WARNING

3
Do not apply cutting force which exceeds the specification in this manual. Failure
to do so may cause severe injury and/or damage to the unit.
Please consult your local distributor before attempting any modification of the
unit.
NO!
WARNING

4
Maintain adequate clearance between the unit and any part of the machine.
Avoid bending the external cables and air tube of the unit.
Use a support, steady rest, or tailstock for heavy or long workpieces to prevent
any injury and/or accident.
Workpiece
Steady Rest
Tailstock
WARNING

5
Avoid sudden impact to any part of the unit which may cause damage to the
internal mechanism.
Mount or dismount the workpiece to or from the unit while the unit is clamped to
avoid damage to the internal mechanism and diminished indexing accuracy of
the unit.
When transporting the unit, make sure to use eye bolts and a sufficient leash or
wire.
Leash or Wire
Eye bolt
NO!
PNEUMATIC
CAUTION

6
NOTICE
Supply air through Air combination (Air filter, Mist separator, regulator) ＋Drain
catcher. (The air supply port is on the motor case.)
Apply air purge inside the motor case
and be sure to provide dry air.
Periodically drain the water in air filter. (It is recommended to use the auto drain type.)
Replace lubricating oil every 6 months.
OUT
IN
Air filter
Drain
Mist separator
Regulator
Drain catcher（SMC）
CAUTION

7
NOTICE
Mount all covers attached with O-rings. (No damages on O-rings)
Do not mount the motor case to the machine tool with the motor case positioned
lower than the body.
There is a danger that lubrication
oil leaks out of the NC rotary table,
thus damaging the brake and
worm part.
O-ring
O-ring
NO!
Cable
Motor Case
Cover

8
2. Specifications
MODEL
ITEM
GT(M)200
GT(M)250
GT(M)320
1
Table Diameter
mm
φ200
φ250
φ320
2
Table Height in Horizontal
mm
178
185
210
3
Center Height in Vertical
mm
140
180
225
4
Center Hole Diameter
mm
φ65H7
φ100H7
φ130H7
5
Thru. Hole Diameter
mm
φ45
φ70
φ105
6
Guide Block Width
mm
14h7
14h7
14h7
7
Clamping Torque
［Pneumatics 0.5MPa]
N･m
820
1600
2800
8
Allowable Workpiece Dia.
mm
310
480
800
9
Allowable Mass
of Workpiece
Horizontal kg
200
250
350
Vertical kg
100
125
180
10
Allowable Work Inertia
kg･m2
1.00
1.95
4.49
11
Total Reduction Ratio
1/72
1/90
1/120
12
Max. Rotation Speed
min-1
41.6
33.3
25
(GT)
16.6
(GTM)
13
Mass of Rotary Table
kg
64
86
145
14
Operating temperature range
C
5～40
15
Operating humidity range
％
30～95
16
Operating altitude range
(above sea level)
m
1000 or lower
17
Storage temperature range
C
-10～60
18
Environmental pollution degree
Degree 3
19
Noise level
dB
79
※The noise level is measured at a distance of 1m from the NC rotary table in front, rear, left,
and right four positions of the unit.
※When storing the unit, conduct the antirust treatment and store it in a place free from
wetting, condensation, or freeze.

9
NOTICE
The above specification table shows the values at standard
specifications. For details, refer to the Outside View.
Be sure to observe the allowance work inertia even if the
mass of workpiece is within the allowable value.
There is any case that the tailstock is required by the mass
of workpiece, shape, cutting conditions, etc.
For the conditions for using the table, refer to the above
specification columns and caution items. Set each cutting
condition so as not to exceed the allowance value.
CAUTION
CAUTION
CAUTION

10
3. Accuracy Standard
（Unit：mm）
Description of Inspection
Guaranteed
Accuracy
1
Run-out of center hole
0.01
2
Run-out of table surface
0.02
3
Parallelism of table surface and reference plane
for horizontal installation
Per 150mm
0.02
4
Parallelism of rotating axis center line and
reference plane for vertical installation
Per 150mm
0.02
5
Parallelism of rotating axis center line and guide
block center
Per 150mm
0.02
6
Indexing accuracy
Cumulative
20 sec
7
Repeatability
Cumulative
4 sec
1
2
3
4
5
6,7 Index accuracy is measured with the optical device.

11
4. Operation Ready
After unpacking, the tilting rotary table is mounted to the machine tool. Observe the following
procedure before performing the operation (trial run).
4-1. Table transfer and mounting to machine tool
1) When transporting the unit, hook ropes to the eyebolts attached and transport the unit
carefully, not giving a shock. The ropes used should be wire ropes having enough
strength to lift up the unit.
2) Clean the table face on the machine tool and the mounting base surface of NC table
after checking that burr or flaw is not found. If the burr or flaw is found, repair them with
the oil grinding stone.
3) The motor case may be removed depending on the maintenance work. Accordingly,
whenever possible, install the NC rotary table in a position where the motor case can be
removed. In case of vertical installation, the guide blocks will fit into the slotted groove
on the machine. If there is any play between the guide block and the T-slot, place the
unit against one side of the T-slot to eliminate the gap.
4) Securely fix the NC rotary table to the machine tool with the attached clamper.
5) To prevent an attached hoisting tap from chip entering, screw the hexagon socket set
screw in the hoisting tap after removing the eye bolt.
Do not enter a part of your body under the NC rotary table
during transportation.
Unexpected accidents such as a disengagement of lifting
devices may cause the NC rotary table to drop on your body.
When mounting the NC rotary table to the machine tool,
check the mounting space carefully. Especially, take care so
that the NC rotary table, cables and air/hydraulic hoses will
not interfere with the splash guard or ATC device and
spindle head of machine tool because the table or spindle
head moves.
Do not damage the cables by placing a heavy thing or
pinching them. If the cables are damaged, there is a danger
of electric shock.
DANGER
WARNING
WARNING

12
Tighten the bolts of clamper at the specified torque by using
the mounting seat effectively.
The transport and lifting devices must be operated only by
the qualified persons for respective devices.
Operating the transport devices by an unqualified person
causes the NC rotary table or machine to be damaged due
to an operation error, resulting in accidents.
When transporting a pallet on which NC rotary table is
mounted, take measures against over-turning or drop.
Transporting the pallet with NC rotary table mounted
unstably may cause the NC rotary table to overturn and then
to drop from the pallet.
Disconnect electric cables and working fluid piping when
relocating the NC rotary table.
Relocating the NC rotary table with electric cables and
working fluid piping connected and hung down causes the
NC rotary table to be unstable or the worker to be tripped,
resulting in unexpected accidents.
Electric cables or working fluid piping may be damaged
during relocation, and if the NC rotary table is installed on
the machine again, unexpected accidents may occur.
If electric cables and working fluid piping cannot be
disconnected, secure them to the NC rotary table.
4-2. Oiling
Lubrication oil has been already filled in NC rotary table before shipping. Check that the
lubrication oil is filled to the center position of the oil gauge before operating the machine.
Replace lubrication oil every 6-month. At this time,
completely drain the oil. When filling the oil tank with
lubrication oil, remove the chip and foreign matter on the oil
filler neck. If the chip and foreign matter are entered, the
WARNING
CAUTION
CAUTION
CAUTION
CAUTION

13
important parts such as the worm gear, bearings, etc., are
seized and accuracy is reduced.
Fill the tank with lubrication oil to center position of oil gauge.
Use the lubricating oil recommended in the table on the item
4-4.
4-3. Required Oil Quantity
（Unit：liter）
MODEL
GT(M)200
GT(M)250
GT(M)320
QTY.(l) at Vertical installation
0.2
0.4
0.7
QTY.(l) at Horizontal installation
0.3
0.5
0.8
Daphne Multiway 32MT (Idemitsu) is provided in the unit before shipping.
4-4. Recommended Lubricating Oil
Grade of Viscosity : ISO VG32
Maker
Oil Name
IDEMITSU
Daphne Multiway 32MT
MOBIL
Vactra oil No.1
JX NIPPON OIL
& ENERGY
Uniway EV32
SHELL
Shell Tonna oil S32
COSMO
Dynaway 32
4-5. Safety of Oil and Antirust Oil Used for the Unit
4-5-1. Scope of application
・Specified lubricating oil
・Specified hydraulic oil（MR，MRT，MX，GT，TM2100･3100，TH2100･3100，
TT(S)101･120，TT140，DM do not use）
・Antirust oil applied to the unit at delivery (Houghton Japan, Rust Veto 377)
4-5-2. First-aid treatment
Aspiration: In case of much aspiration, go to a place where there is fresh air, and cover your
body with a blanket to keep your body warm. Consult a doctor if necessary.
CAUTION

14
Sticking to your skin: Wipe off the oil, and wash your skin with water and soap. If you feel
itchy or you get inflamed, consult a doctor immediately.
Entering your eye: Wash your eye with fresh water for at least 15 minutes, and then consult
a doctor.
Accidental drinking: Consult a doctor immediately without vomiting forcibly. If you are
polluted in your mouth, wash with water thoroughly.
・For lubrication oils and hydraulic oils other than specified ones, and antirust oils
prepared by the customer, refer to the safety information prepared for respective
oils.
4-5-3. Flammable characteristics
・Watch out for fire since lubricating oil and hydraulic oil are flammable. Hazardous
substances will be generated if they combusted.
・The flash point of lubricating oil and hydraulic oil put in the unit at the delivery
exceeds 200C. It may be different from that of the lubricating oil and hydraulic oil
prepared by the customer.
・Antirust oil is highly volatile and thus likely to catch fire, and also it mixes with air to
form explosive mixture gas.
・The flash point of antirust oil applied to the unit at the delivery is 38C. It may be
different from that of the antirust oil prepared by the customer.
4-5-4. Disposal of lubricating oil and hydraulic oil
Dispose of used lubricating oil and hydraulic oil exhausted from this unit in accordance with
the laws and regulations of your country. You may suffer punishment if you disposed of
waste oil without following the laws and regulations.

15
5. Inspection
Daily inspection
1) Confirm that the NC rotary tables (including jigs, if attached) are securely fixed.
2) Confirm that the chips accumulating in a rotary part of NC rotary table are removed.
3) Confirm that the electric connection cables and hoses are not damaged and the
pneumatic pressure is appropriate.
4) Confirm that the machine-zero operation and indexing operation and position.
5) Confirm that there is no abnormal vibration or noise. (eq. Body and motor)
6) Confirm that there is no abnormal heating. (eq. Body and motor)
7) Is supply air clean? (Maintenance of air combination, replacement of filter, drain volume,
etc.)
Periodic inspection （Inspect the following items every six months.）
1) Confirm that muddiness of the lubricating oil.
2) Confirm that the connectors are securely attached and there is no damage on the
cables.
3) Confirm that corrosion and breaking of the wiring in the motor case.
6. Use of NC Rotary Table
This unit is installed on the machining centers, and on its table surface the chuck or fixture is
attached to clamp the workpiece. It indexes the angle of machining position by the control of
machining center or Kitagawa’s own controller. During the machining, the working fluid is
supplied to retain the workpiece.