www.komaprecision.com • [email protected]Technical Information EXPLANATION OF TECHNICAL TERMS 1. INDEXING ACCURACY By indexing one rotation of the table equally to coincide with the tooth number of the worm gear and measuring the result, the difference between the theoretical turning angle of the table and actual measurement is obtained. As shown below, the indexing accuracy is equal to the sum of the maximum difference of the positive value and that of the negative value, as an absolute value. 2. REPEATABILITY Indexing operations for positioning at four determined angular positions as 0°, 90°, 180°, and 270° are carried out five times for positive rotation, and the indexing angles are measured. As a result, the difference between the maximum and the minimum of the measurement at each angular position is obtained. Indexing operations for positioning for negative rotaion and the measurement of the indexing angles are similarly carried out, and the difference between the maximum and the minimum of the measurement is obtained. The repeatability is equal to the maximum value of the difference obtained through both measurements. 3. CLAMP TORQUE The clamp torque specifications cover only the clamping mechanism; the self-locking caused by the worm gear is not included. The clamp torque specifications in the catalog are the obtained when the rated pressure (500 PSI for hydraulic pressure, and 72 PSI for pneumatic pressure) is supplied to the table. If a more powerful clamp torque than specified in the catalog is required, the supply pressure can be elevated to the maximum allowable pressure (700 PSI for hydraulic pressure, and 100 PSI for pneumatic pressure), and the clamp torque will be proportionally increased. 4. ALLOWABLE WHEEL TORQUE The allowable wheel torque is equal to the allowable torque for the worm wheel when the table rotation speed is 1 RPM. The allowable torque for the worm wheel is subject to the standard stipulated by the Japan Gear Manufacturers Association. Table Turning Angle (degrees) 4 2 0 - 2 - 4 - 6 - 8 - 10 - 12 Indexing Measurement Data (sec) Table Turning Angle and Indexing Measurement Data Max. difference of positive value Max. difference of negative value Indexing accuracy 90° 180° 270° 360°
By indexing one rotation of the table equally to coincide with the tooth number of the worm gear and measuring the result, the difference between the theoretical turning angle of the table and actual measurement is obtained. As shown below, the indexing accuracy is equal to the sum of the maximum difference of the positive value and that of the negative value, as an absolute value.
2. REPEATABILITY Indexing operations for positioning at four determined angular positions as 0°, 90°, 180°, and 270° are carried out five times for positive rotation, and the indexing angles are measured. As a result, the difference between the maximum and the minimum of the measurement at each angular position is obtained. Indexing operations for positioning for negative rotaion and the measurement of the indexing angles are similarly carried out, and the difference between the maximum and the minimum of the measurement is obtained. The repeatability is equal to the maximum value of the difference obtained through both measurements.
3. CLAMPTORQUE
The clamp torque specifications cover only the clamping mechanism; the self-locking caused by the worm gear is not included. The clamp torque specifications in the catalog are the obtained when the rated pressure (500 PSI for hydraulic pressure, and 72 PSI for pneumatic pressure) is supplied to the table. If a more powerful clamp torque than specified in the catalog is required, the supply pressure can be elevated to the maximum allowable pressure (700 PSI for hydraulic pressure, and 100 PSI for pneumatic pressure), and the clamp torque will be proportionally increased.
4. ALLOWABLEWHEELTORQUE
The allowable wheel torque is equal to the allowable torque for the worm wheel when the table rotation speed is 1 RPM. The allowable torque for the worm wheel is subject to the standard stipulated by the Japan Gear Manufacturers Association.
FANUC Alpha (α) type servo motors are standard for Tsudakoma rotary tables. The table below shows additional servo motors classified according to FANUC Alpha (α) type motor capacity.
HEIDENHAIN - QSY 116C QSY 116E QSY 155B -Notes: 1. For non-FANUC motors, the table speed reduction ratio or motor dimensions may be different from FANUC motors.
2. Motors described above are selected for the equivalent motor torque capacity. The motor which is actually used on your rotary table is determined by the specifications of your machine tool NC controller.
3. Motors other than those listed above are available.
As a general rule it is recommended to control a Tsudakoma rotary table with the servo ON. The following are recommended flow charts.
Notes: 1. In a semi-closed loop control operation, do not turn the Servo OFF even when the rotary table is clamped.2. In a semi-closed operation, if the eccentric load becomes larger and a large electric current estimated at
around 70% of the rated current keeps being supplied, it is necessary to turn the Servo OFF. In such a case,follow the steps for operating the fully-closed loop control.
CONTROL FLOW CHART
SEMI-CLOSED LOOP CONTROL FULLY CLOSED LOOP CONTROL
The graphs below show the required indexing time, which includes the time for the control command for the machine tool. This information helps you examine the working cycle time when operating the rotary table. The table rotation speed and the acceleration and deceleration constant may differ depending of the model of the rotary table. Koma Precision has additional indexing time charts available for your review.
A: Without clamp command B: For hydraulic clamp C: For pneumatic clamp D: For air-hydraulic clamp
WORKPIECE MOUNTING SPACE FOR TILTING ROTARY TABLES
TN-100
0 ~ + 90° 0 ~ + 107° 0 ~ - 17°
TN-130
0 ~ + 90° 0 ~ + 107° 0 ~ - 17°
TN-160
0 ~ + 90° 0 ~ + 110° - 30° ~ 0
TN-200
0 ~ + 90° 0 ~ + 110° - 30° ~ 0
TN-320
0 ~ + 90° 0 ~ + 110° - 30° ~ 0
Notes: 1. If workpiece mounting is over the space limit above, a separate check for interference is required.
Ø250Ø250
180
20°
Ø400
Ø250Ø360
100
130
175
Ø320
20°
Ø354
30
60
20
Ø490Ø440Ø374Ø354
Ø200Ø200
Ø338
90 1
76
20°
Ø200
Ø192
105
Ø180
17°
50
180Ø150Ø150
10
Ø180Ø230
Ø150
17°
65
169Ø140Ø150
45
Ø160Ø260
Koma application engineers - with AutoCAD® and SolidWorks® 3D CAD support - ensure Tsudakoma rotary tables purchased from Koma will be the best available for the required machining operations. Torque calculations and interference drawings are standard no-charge, value added services offered by Koma Precision.
1. Determine the controller system that will drive the rotary table.Control system #1: A 4th axis (or 5th axis) feature is installed in the machine tool control.
X-axisY-axis
Z-axis4
th axis
Structure
Features
• Simultaneous and continuous contour cutting in the X, Y, and Z-axes ispossible subject to the capabilities of the machine tool control.
• Rotary table programming is input at the machine tool control.
Control system #2: (1) or (2) Tsudakoma TPC single axis NC controllers are used (M-code sent from the machine tool).
M signal
TPC controller
X-axis
Y-axis
Z-axis
Structure
Features
• If the machine tool control does not have 4th axis capabilities, but anM-code signal is available, a TPC controller can be used to control therotary table.
• This control system is only for indexing.• Rotary table programming should be input directly into the TPC. At themachine tool an M-code signal is indexed and input as a start command.
2. Select a rotary table by determining the workpiece parameters and the machiningoperations to be performed.
Workpiece diameter
Should not be larger than the rotary table diameter
Should not exceed the maximum specified figure.
The workpiece inertia should not exceed the maximum specified figure. The part mustnot have any machinetool interference.
The workpiece must not have any machinetool interference.
Workpiece with eccentric load
Workpiece of larger diameter, but lighter weight
Workpiece weight Workpiece positioning
The value of(F×L) should not be greater than the clamp force.
LF
.
3. Determine the motor location on the rotary table.
Ensure that there is no machine tool, rotary table, workpiece, or tool changerinterference.
Motoron left
Motoron right
4. Ensure there is no rotary table/workpiece/machine tool interference.
No interference with the ATC?
Does the combined weight of the workpiece & rotary table remain within the allowable load for the machine tool?
No interference with the column?
Does any effective stroke remain for the Z-axis?
No interference with splash guard? Will the combined size of the
workpiece and the rotary table fit on the machine tool?
Servo motor
Control panel
Machine toolHydraulic/pneumatic pressure hose for clamping
Power cable & signal cable for motor
(model determined by the NC controller.)4th-axis control unit
4thaxis
X-axis
Y-axis
Z-axis
Rotary table
Pneumatic pressure hose for clamping
Power cable & signal cable for motor
(used for TPC only)Servo motor Terminal block for M-code
6. General layout of workpiece and fixture (include dimension from top surface of the machine tool table to thecenter line of the rotary table face plate)
RN/RNA-SERIES Unit : mmNo. Inspection items RN-100 RNA-160 RNA-200 RNA-250 RNA-3202 Table top runout 0.01 0.01 0.01 0.01 0.013 Parallelism of table top to frame bottom Per overall length Horizontal 0.015 0.02 0.02 0.02 0.024 Center bore runout Spindle nose 0.01 0.01 0.01 0.01 0.015 Perpendicularity of table top to frame bottom Per overall length Vertical 0.02 0.02 0.02 0.02 0.026 Perpendicularity of table top to frame bottom guide blocks Per overall length Vertical 0.02 0.02 0.02 0.02 0.027 Indexing accuracy (arc sec.) ±22.5 ±12.5 ±10 ±10 ±109 Height difference of both center lines of headstock and tailstock Vertical 0.03 0.03 0.03 0.03 0.03
Note: For RN-100, RNA-160 and 200 models, “Spindle end” replaces “Table top”
RNCV-SERIES Unit : mm
No. Inspection items RNCV-401 RNCV-801 RNCV-1001Standard With scale Standard With scale Standard With scale
1 Table top flatness (concave) Per overall length 0.02 0.01 0.03 0.02 0.04 0.022 Table top runout 0.015 0.01 0.02 0.01 0.03 0.023 Parallelism of table top to frame bottom Per overall length Horizontal 0.02 0.01 0.03 0.02 0.04 0.024 Center bore runout Spindle nose 0.01 0.005 0.01 0.005 0.01 0.015 Perpendicularity of table top to frame bottom Per overall length Vertical 0.02 0.01 0.03 0.02 0.04 0.036 Perpendicularity of table top to frame bottom guide blocks Per overall length Vertical 0.02 0.01 0.03 0.03 0.04 0.037 Indexing accuracy (arc sec.) ±7.5 ±4 ±7.5 ±4 ±7.5 ±4
8 Parallelism of center line between rotary table and tailstock to frame bottom guide blocks Per 300mm Vertical 0.02 0.01 0.02 0.02 0.02 0.02
9 Height difference of both center lines of rotary table and tailstock (Tailstock center line should be higher) Vertical 0.02 0.01 0.02 0.02 0.02 0.02
Note: Indexing accuracy above is for the table with MP scale.
RNCM-SERIES Unit : mm
No. Inspection items RNCM-251, 301 RNCM-401, 501 RNCM-631Standard With scale Standard With scale Standard With scale
1 Table top flatness (concave) Per overall length 0.01 0.01 0.02 0.01 0.03 0.022 Table top runout 0.015 0.01 0.015 0.01 0.02 0.013 Parallelism of table top to frame bottom Per overall length Horizontal 0.02 0.01 0.02 0.01 0.03 0.024 Center bore runout Spindle nose 0.01 0.005 0.01 0.005 0.01 0.0055 Perpendicularity of table top to frame bottom Per overall length Vertical 0.02 0.01 0.02 0.01 0.03 0.026 Perpendicularity of table top to frame bottom guide blocks Per overall length Vertical 0.02 0.01 0.02 0.01 0.03 0.037 Indexing accuracy (arc sec.) ±7.5 ±10 ±7.5 ±4 ±7.5 ±4
8 Parallelsim of center line between rotary table and tailstock to frame bottom guide blocks Per 300mm Vertical 0.02 0.01 0.02 0.01 0.02 0.02
9 Height difference of both center lines of rotary table and tailstock (Tailstock center line should be higher) Vertical 0.02 0.01 0.02 0.01 0.02 0.02
Note: Indexing accuracy above is for the table with MP scale.
Standard With scale Standard With scale1 Table top flatness (concave) Per overall length 0.01 0.01 0.02 0.012 Table top runout 0.015 0.01 0.015 0.013 Parallelism of table top to frame bottom Per overall length Horizontal 0.02 0.01 0.02 0.014 Center bore runout Spindle nose 0.01 0.005 0.01 0.0055 Perpendicularity of table top to frame bottom Per overall length Vertical 0.02 0.01 0.02 0.016 Perpendicularity of table top to frame bottom guide blocks Per overall length Vertical 0.02 0.01 0.02 0.017 Indexing accuracy (arc sec.) ±7 ±4 (±5) *1 ±7 (±10) *2 ±48 Parallelism of center line between rotary table and tailstock to frame bottom guide blocks Per 300mm Vertical 0.02 0.01 0.02 0.01
9 Height difference of both center lines of rotary table and tailstock (Tailstock center line should be higher) Vertical 0.02 0.01 0.02 0.01
Notes: 1. Indexing accuracy above is for the table with MP scale. 2. For RB-K models, No. 3 does not apply. 3. The figure in ( )*1 above shows an indexing accuracy with scale for the RB-250 and RB-250K.4. The figure in ( )* 2 above shows an indexing accuracy for the RB-500 and RB-500K. 5. For RB and RB-K rotary tables with a 1/60 gear ratio or less, indexing accuracy is ±10 arc sec.
RNCK-SERIES Unit : mm
No. Inspection items RNCK-631Standard With scale
1 Table top flatness (concave) Per overall length 0.03 0.022 Table top runout 0.02 0.014 Center bore runout Spindle nose 0.01 0.0055 Perpendicularity of table top to frame bottom Per overall length 0.03 0.026 Perpendicularity of table top to frame bottom guide blocks Per overall length 0.03 0.037 Indexing accuracy (arc sec.) ±7.5 ±48 Parallelsim of center line between rotary table and tailstock to frame bottom guide blocks Per 300mm 0.02 0.029 Height difference of both center lines of rotary table and tailstock (Tailstock center line should be higher) 0.02 0.02
Note: Indexing accuracy above is for the table with MP scale.
RNC-SERIES Unit : mm
No. Inspection items RNC-801 RNC-1001, 1201, 1501 RNC-2001Standard With scale Standard With scale Standard With scale
1 Table top flatness (concave) Per overall length 0.03 0.02 0.04 0.02 0.04 0.032 Table top runout 0.02 0.01 0.03 0.02 0.03 0.023 Parallelism of table top to frame bottom Per overall length 0.03 0.02 0.04 0.02 0.04 0.034 Center bore runout Spindle nose 0.01 0.005 0.01 0.01 0.01 0.017 Indexing accuracy (arc sec.) ±7.5 ±4 ±7.5 ±4 ±7.5 ±4
Note: Indexing accuracy above is for the table with MP scale.
1 Table top flatness (concave) Per overall length 0.01 0.022 Table top runout 0.015 0.0153 Parallelism of table top to frame bottom Per overall length Horizontal 0.02 0.024 Center bore runout Spindle nose 0.01 0.015 Perpendicularity of table top to frame bottom Per overall length Vertical 0.02 0.026 Perpendicularity of table top to frame bottom guide blocks Per overall length Vertical 0.02 0.027 Indexing accuracy (arc sec.) ±7.5 ±7.58 Parallelism of center line between rotary table and tailstock to frame bottom guide blocks Per 300mm Vertical 0.02 0.02
9 Height difference of both center lines of rotary table and tailstock (Tailstock center line should be higher) Vertical 0.02 0.02
Notes: 1. For RTV,CA models, No. 3 does not apply.
RZ-SERIES INDEXERS Unit : mmNo. Inspection items RZ-160 RZ-2002 Spindle end runout 0.015 0.0153 Parallelism of spindle to frame bottom Per overall length Horizontal 0.02 0.024 Center bore runout Spindle nose 0.015 0.025 Perpendicularity of spindle end to frame bottom Per overall length Vertical 0.02 0.026 Perpendicularity of spindle end to frame bottom guide Per overall length Vertical 0.02 0.027 Indexing accuracy (arc sec.) ±22.5 ±22.59 Height difference of both center lines of headstock and tailstock Vertical 0.03 0.03
1 Table top runout 0.015 0.015 0.015 0.022 Center bore runout 0.01 0.015 0.02 0.023 Indexing accuracy (arc sec.) ±30 ±15 ±15 ±154 Perpendicularity of table top to frame bottom Per overall length Vertical 0.02 0.02 0.02 0.025 Parallelism & perpendicularity of table top to base bottom guide blocks Per overall length Vertical 0.02 0.02 0.02 0.036 Difference among all center heights Vertical 0.02 0.02 0.02 0.027 Difference among distances between base bottom guide blocks & tailstock Vertical 0.02 0.02 0.02 0.028 Height difference of both center lines of headstock and tailstock Vertical 0.03 0.03 0.03 0.039 Parallelsim of table top to base bottom Per overall length Horizontal 0.015 0.02 0.02 0.0210 Difference among the average heights between base bottom and table top Horizontal 0.02 0.02 0.02 0.0211 Difference among the center bore positions based on base bottom guide blocks Horizontal 0.02 0.02 0.02 0.02
Notes: 1. For RN-150 and RN-200 models, “spindle end” replaces “table top.”2. If guide blocks are not installed on the base, “base reference face” replaces “base bottom guide blocks” (No. 5, 7, and 11).
TTNC MULTI-SPINDLE SERIES Unit : mmNo. Inspection items TTNC-102,2 TTNC-101,4 TTNC-151,2 TTNC-201,21 Table top flatness (concave) Per overall length — — 0.02 0.012 Table top runout 0.015 0.015 0.015 0.0153 Difference between average heights of both tables at 0° position 0.02 0.02 0.02 0.024 Difference between distances between frame standard face and both table tops at 90° position 0.02 0.02 0.02 0.025 Parallelism of table top to frame bottom Per overall length 0.015 0.015 0.02 0.026 Parallelism of tilt axis center to frame bottom Per overall length 0.02 0.02 0.02 0.027 Center bore runout Spindle nose 0.015 0.01 0.01 0.018 Tilting accuracy (arc sec.) 0 ~ + 90° ±22.5 ±30 ±30 ±309 Indexing accuracy (arc sec.) ±20 ±30 ±15 ±7.510 Table center distance ± 0.02 ± 0.02 ± 0.02 ± 0.0211 Difference between both center heights at 90° position 0.02 0.02 0.02 0.02
12 Parallelism of table top to frame bottom guide blocks Per overall length(at 90° position) 0.015 0.015 0.02 0.02
Note: For the TTNC-102,2 and TTNC-101,4 all descriptions of “table top” seen in the inspection items above should be “spindle end surface.”
TTNC-101,4 with 5C collets
TN-SERIES Unit: mm
No. Inspection items TN-100 TN-130 TN-160 TN-200 TN-320Standard Standard Standard Standard Standard
1 Table top flatness (concave) Per overall length — — — — 0.012 Table top runout 0.015 0.015 0.015 0.015 0.0153 Parallelism of table top to frame bottom Per overall length 0.015 0.015 0.02 0.02 0.024 Parallelism of tilt axis center to frame bottom Per overall length 0.02 0.02 0.02 0.02 0.025 Center bore runout Spindle nose 0.015 0.015 0.015 0.02 0.01
- 30° ~ + 90° — — ±30 ±30 ±307 Indexing accuracy (arc sec.) ±20 ±20 ±15 ±15 ±108 Parallelism of spindle top to frame bottom guide blocks Per overall length 0.015 0.015 0.02 0.02 0.02
THNC-SERIES Unit: mm
No. Inspection items THNC-251, 301Standard With Scale
1 Table top flatness (concave) Per overall length 0.01 0.012 Table top runout 0.015 0.0153 Parallelism of table top to frame bottom Per overall length 0.02 0.024 Parallelism of tilt axis center to frame bottom Per overall length 0.02 0.025 Center bore runout Spindle nose 0.01 0.016 Tilting accuracy (arc sec.) 0° ~ + 90° ±30 ±307 Indexing accuracy (arc sec.) ±7.5 ±58 Parallelism of table top to frame bottom guide blocks Per overall length 0.02 0.029 Perpendicularity of table to frame bottom guide blocks Per overall length 0.02 0.02
Note: Indexing accuracy above is for the table with MP scale.
