The includes gearheads for high precision control of ATC magazines, ATC arms, APC, and turret drives of lathe machining centers. Series Series

High Precision Gearheads

The includes gearheads for high precision control of ATC magazines, ATC arms, APC, and turret drives of lathe machining centers. Series Series

Table of Contents Examples of Use 2 to 3 For Machining Center For NC Lathe or Combined Lathe Features and Configurations 4 Principle of Operation 5 Rating Table 6 to 7 Glossary 8 to 9 Life Rating Allowable Acceleration/Deceleration Torque Momentary Maximum Allowable Torque Allowable Output Speed [Continuous] Allowable Output Speed [Intermittent] Torsional Rigidity, Lost Motion, Backlash Calculation of Torsion Angle Allowable Moment and Maximum Thrust Load Momentary Maximum Allowable Moment Allowable Moment Diagram Performance 10 to 11 Efficiency Low-temperature Characteristics No-load Running Torque Selection Flowchart 12 to 13 Engineering Notes 14 to 17 Appendix 1 Quick Selection Table of Product Codes RA-EA Series (Case rotating type) 21 to 24 RA-EC Series (Shaft rotating type) 25 to 28

Examples of Use For Machining Center Cam drive for ATC arms RA Series ATC magazine drive RA Series APC drive RA Series Rotary table NT Series Contact us for NT Series rotary tables. 2

For NC lathe or combined lathe ATC magazine drive RA Series Lathe turret drive RA Series RA-EA Series RA-EC Series 3

Features and Configurations High shock load capability High rigidity High precision High torque Heavy load support The double-ended support design and unique pin gear mechanism provide the following advantages: (1) Capable of high shock load 5 times the rated torque (2) High torsional rigidity (3) Small backlash [1 arc.min] (4) High torque density (capable of high torque with downsized gear) A set of internal main bearings (large angular ball bearings) enables complete support of heavy external loads. Three benefits due to the above features 1. Maintenance: Trouble free 2. Compact design with a reduced number of parts 3. Reduced man-hours (for design, assembly, and adjustment) Tool and holder Tool and holder Sprocket Sprocket Reduction gear Reduction gear The rotation direction of the output shaft is opposite to that of the servo motor. Servo motor The rotation direction of the output shaft is the same as that of the servo motor. Servo motor Fixed frame Fixed frame RA-EA Series RA-EC Series 4

Principle of Operation 1. Rotation of the servo motor is transmitted through the input gear to the spur gears, and the speed is reduced according to the gear ratio between the input gear and the spur gears. <Fig. 1> 2. Since the crankshafts are directly connected to the spur gears, they have the same rotational speed as the spur gears. <Fig. 1> Fig. 1. First reduction section Spur gear Crankshaft 3. Two RV gears are mounted around the needle bearings on the eccentric section of the crankshaft. (In order to balance the equal amount of force, two RV gears are mounted.) <Fig. 2> 4. When the crankshafts rotate, the two RV gears mounted on the eccentric sections also revolve eccentrically around the input axis (crank movement). <Fig. 2> 5. Pins are arrayed in a constant pitch in the grooves inside the case. The number of pins is just one larger than the number of RV gear teeth. <Fig. 3> 6. As the crankshafts revolve one complete rotation, the RV gears revolve eccentrically one pitch of a pin (crank movement), with all the RV teeth in contact with all of the pins. As a result, 1 RV gear tooth moves in the opposite direction of the crankshaft rotation. <Fig. 3> Fig. 2. Crankshaft section Crankshaft Eccentric section Input gear Spur gear Rotation 7. The rotation is then output to the shaft (output shaft) via the crankshaft so that the crankshaft rotation speed can be reduced in proportion to the number of pins. <Fig. 3> 8. The total reduction ratio is the product of the fi rst reduction ratio multiplied by the second reduction ratio. Rotation Eccentric movement Needle bearing RV gear Fig. 3. Second reduction section RV gear Pin Case Crankshaft (connected to the spur gear) Shaft Crankshaft Rotation angle 0 Rotation angle 180 Rotation angle 360 5

Rating Table Model Speed Ratio To No K Ts1 Ts2 Rated Torque Rated Output Speed Rated Life Allowable Acceleration/ Deceleration Torque Momentary Maximum Allowable Torque RA-EA Series RA-20EA RA-40EA RA-80EA RA-160EA RA-EC Series RA-20EC RA-40EC RA-80EC RA-160EC N-m (kgf-m) rpm Hr N-m (kgf-m) N-m (kgf-m) 80 104 120 140 160 167 15 6000 412 833 (17) (42) (85) 80 104 120 152 412 15 6000 1029 2058 (42) (105) (210) 80 100 120 152 784 15 6000 1960 3920 (80) (200) (400) 80 100 128 144 170 1568 15 6000 3920 7840 (160) (400) (800) 81 105 121 141 161 167 15 6000 412 833 (17) (42) (85) 81 105 121 153 412 15 6000 1029 2058 (42) (105) (210) 81 101 121 153 784 15 6000 1960 3920 (80) (200) (400) 81 101 129 145 171 1568 15 6000 3920 7840 (160) (400) (800) Note: 1. The Rating Table shows the specifi cation values of each individual reduction gear. 2. The allowable output speed may be limited by heat depending on the operating rate. 3. For the inertia moment of the reduction gears, refer to the Product Summary Sheet. 4. For dimensions α and L, refer to Allowable Moment and Maximum Thrust Load. 6

Capacity of main bearing Ns1 Ns2 Mo Ms1 Fo α L Allowable Allowable Output Output Speed Speed [Continuous] [Intermittent] Note 2 rpm Backlash Lost Motion Note 2 rpm arc.min. arc.min. Torsional Rigidity (Spring Constant) N-m/ arc.min. (kgf-m/ arc.min.) Allowable Moment N-m (kgf-m) Momentary Maximum Allowable Moment N-m (kgf-m) Maximum Thrust Load Dimension α Dimension L Note 4 Note 4 Mass N (kgf) mm mm kg 45 75 1.0 1.0 49 882 1764 3920 63.1 113.3 10 (5) (90) (180) (400) 42 70 1.0 1.0 108 1666 3332 5194 83.1 143.7 18.5 (11) (170) (340) (530) 42 70 1.0 1.0 196 2156 4312 7840 81.5 166 28 (20) (220) (440) (800) 27 45 1.0 1.0 392 3920 7840 14700 93.8 210.9 58 (40) (400) (800) (1500) 45 75 1.0 1.0 49 882 1764 3920 122.2 113.3 9.5 (5) (90) (180) (400) 42 70 1.0 1.0 108 1666 3332 5194 148.1 143.7 20 (11) (170) (340) (530) 42 70 1.0 1.0 196 2156 4312 7840 158.4 166 27 (20) (220) (440) (800) 27 45 1.0 1.0 392 3920 7840 14700 201.8 210.9 59 (40) (400) (800) (1500) RA-EA Series (Case rotating type) RA-EC Series (Shaft rotating type) Servo motor Servo motor Fixed part Rotating part (Case) Fixed Rotating part (Shaft) Fixed part Fixed 7

Glossary Life Rating The life time when driven at the rated torque and rated output speed is called the life rating. Allowable Acceleration/Deceleration Torque When the machine starts or stops, the load torque to be applied to the reduction gear is larger than the constantspeed load torque due to the effect of the inertia torque of the rotating part. In such a situation, the allowable torque during acceleration/deceleration is referred to as allowable acceleration/deceleration torque. Note: Be careful so that the load torque, which is applied during normal operation, does not exceed the allowable acceleration/deceleration torque. Momentary Maximum Allowable Torque A large torque may be applied to the reduction gear due to an emergency stop or an external shock. The allowable value of the momentary applied torque at this time is referred to as momentary maximum allowable torque. Note: Be careful so that the momentary excessive torque does not exceed the momentary maximum allowable torque. Torsional Rigidity, Lost Motion, Backlash When a torque is applied to the output shaft while the input shaft is fi xed, torsion is generated according to the torque value. The torsion can be shown in the hysteresis curve. The value of b/a is referred to as torsional rigidity. The torsion angle at the mid point of the hysteresis curve width within ±3% of the rated torque is referred to as lost motion. The torsion angle when the torque indicated by the hysteresis curve is equal to zero is referred to as backlash. Hysteresis curve Backlash Torsion angle ±3% rated torque ±100% rated torque b Lost motion a Momentary max. torque Load torque Max. torque for startup Constant torque Time Calculation of torsion angle Taking RA-160E as an example, the torsion angle will be calculated when torque is added in one direction. 1) When the load torque is 30 N-m... Torsion angle (ST1) When the load torque is within the lost motion area Max. torque for stop ST1= 30 x 1 (arc.min.) = 0.32 arc.min or less 47 2 Allowable Output Speed [Continuous] The allowable output speed when the machine starts and stops repeatedly is referred to as allowable output speed [Continuous]. Note: Maintain the environment and operation conditions so that the temperature of the reduction gear case is 60ºC or lower. 2) When the load torque is 1,300 N-m... Torsion angle (ST2) When the load torque is within the rated torque area ST2= 1 + 1300 47.0 = 3.70 arc.min. 2 392 Note: 1. The torsion angles that are calculated above are for a single reduction gear. 2. For the customized specifications of the lost motion, contact us. 8 Allowable Output Speed [Intermittent] The allowable output speed during the operation in which the reduction gear is not activated frequently is referred to as allowable output speed [Intermittent]. Note: Maintain the environment and operation conditions so that the temperature of the reduction gear case is 60ºC or lower. Models Torsional rigidity (Spring Constant) N-m/arc.min. Lost motion arc.min. Lost motion Measured torque N-m ± 5.0 RA-20E 49 RA-40E 108 ± 12.3 1.0 RA-80E 196 ± 23.5 RA-160E 392 ± 47.0 Backlash arc.min. 1.0

Allowable Moment and Maximum Thrust Load The external load moment may be applied to the reduction gear during normal operation.. The allowable values of the external moment and the external axial load at this time are each referred to as allowable moment and maximum thrust load. Mc : Load moment (N-m) W1, W2 : Load (N) L1, L2 : Distance to the point of load application (mm) α : Designated dimension (mm) (Refer to the Rating Table.) L : Designated dimension (mm) (Refer to the Rating Table.) W1 x (L1 + α) + W2 x L2 Mc = 1000 Mc Allowable moment Note: 1. When the load moment and the thrust load are applied concurrently, ensure that the reduction gear is used within the corresponding allowable moment range, which is indicated in the allowable moment diagram. 2. When W1 load is applied in the area of the dimension L, use it within the allowable radial load, calculated using the formula below. RA-EC L2 W2 W1 L1 Momentary Maximum Allowable Moment A large moment may be applied to the reduction gear due to an emergency stop or external shock. The allowable value of the momentary applied moment at this time is referred to as momentary maximum allowable moment. Note: Be careful so that the momentary excessive moment does not exceed the momentary maximum allowable moment. Allowable Moment Diagram 14700 735 1450 1660 2520 α L Allowable radial load = Allowable moment : (N) L RA-EA W1 Thrust load (N) 7840 5194 40E 80E 160E 4890 L2 3920 3410 20E 3040 2040 W2 882 1666 2156 3920 Load moment (N-m) α L L1 9

Performance Efficiency RA Sries Case temperature: 30 C Lubricant: Grease (Molywhite RE00) 100 80 20E 10rpm 30rpm 60rpm 100 80 40E 10rpm 25rpm 50rpm Efficiency (%) 60 40 20 Efficiency (%) 60 40 20 0 50 100 150 200 Output torque (N-m) 0 100 200 300 400 500 Output torque (N-m) 100 80 80E 10rpm 25rpm 50rpm 100 80 160E 10rpm 25rpm 40rpm Efficiency (%) 60 40 Efficiency (%) 60 40 20 20 0 250 500 750 1000 Output torque (N-m) 0 500 1000 1500 2000 Output torque (N-m) Low-temperature characteristics (No-load running torque for low-temperature range) RA Series RA Series: Input speed Lubricant: Grease (Molywhite RE00) 2 20E 5 40E No-load running torque Input axis (N-m) 1 Case temperature ( C) Speed ratio 57 105 0 141-10 0 10 20 No-load running torque Input axis (N-m) 4 3 2 Case temperature ( C) Speed ratio 1 57 121 153 0-10 0 10 20 10 80E 15 160E 10 No-load running torque Input axis (N-m) 8 6 4 Case temperature ( C) Speed ratio 2 57 121 0 171-10 0 10 20 No-load running torque Input axis (N-m) 10 Speed ratio 5 81 129 171 0-10 0 10 20 Case temperature ( C)

No-load running torque RA Series Case temperature: 30 C Lubricant: Grease (Molywhite RE00) 200 550 500 450 No-load running torque on the output shaft side (N-m) 150 100 50 80E 40E No-load running torque on the output shaft side (N-m) 400 350 300 250 200 150 160E 20E 100 50 0 20 40 60 80 100 Output shaft speed (rpm) 0 10 20 30 40 50 Output shaft speed (rpm) The no-load running torque that is converted to the input shaft side value should be calculated using the following equation: No-load running torque on the input shaft side (N-m) = No-load running torque on the output shaft side (N-m) Speed ratio 11

Selection Flowchart (1) Examine the load characteristics Check the load torque applied to the reduction gear. An example is shown in the load cycle diagram. Examine the average load torque (Tm) Examine the average output speed (Nm) 10 3 Tm = Nm = 10 10 10 t1 N1 3 T1 + t2 N2 3 T2 +... tn Nn Tn 3 t1 N1 + t2 N2 +... tn Nn t1 N1 + t2 N2 +... tn Nn t1 + t2 +... tn Temporary selection of the model from the rating table Increase the model number of the reduction gear Decrease the load External impact torque Tem Load cycle diagram Rotation load torque Max. torque for startup T1 Constant torque T2 0 Max. torque for stop T3 Calculation of life (Lh) No Lh = 6000 x Nm To x ( Tm ) 10 3 RPM N2 N1 t1 t2 t3 Acceleration Constant Deceleration time drive time time N3 Shock time tem Nem NO Lh Required life Time YES Examine the input speed Input speed Maximum Speed allowable output Ratio speed NO YES Examine the acceleration/decelerati on torque (T1, T3) Allowable acceleration/ T1orT3 deceleration torque NO YES Examine the external impact torque (Tem) due to an emergency stop Momentary Tem maximum allowable torque YES Calculation of allowable applied speed (Cem) Actual applied Cem speed YES 12 Examine the external impact torque (Tout) when motor shaft is not rotating. Tout: Assumed values Tout NO Momentary maximum allowable torque NO YES Cem = 5 To 775 x ( Tem ) Nem 40 x x tem 60 10 3 NO

(2) Examine the main bearing capacity Examine the thrust load (W2) W2 Allowable thrust (W) YES Examine the load moment Check the external load applied to the reduction gear. When the load moment and the thrust load are applied concurrently, ensure that the reduction gear is used within the corresponding allowable moment range, which is indicated in the allowable moment diagram. NO Increase the model number Decrease W2 (Refer to page 09) Mc = {W1 x (α1 + L1) + W2 x L2) x 10-3 Mc Mo Increase the model number Decrease the load Tm = = 1,475N-m Selection examples (1) Examine the load characteristics Usage conditions T1 = 2,500N-m T2 = 500N-m T3 = 1,500N-m Tem = 7,000N-m t1 = 0.2sec t2 = 0.5sec t3 = 0.2sec tem = 0.05sec N1 = N3 = 10r.p.m. N2 = 20r.p.m. Nem = 20r.p.m. Calculation of average load torque 10 10 10 10 3 3 3 3 0.2 x 10 x 2,500 + 0.5 x 20 x 500 +0.2x10x1,500 0.2 x 10 + 0.5 x 20 + 0.2 x 10 Calculation of average output speed 0.2 x 10 + 0.5 x 20 + 0.2 x 10 Nm = = 15.6r.p.m. 0.2 + 0.5 + 0.2 Tentative selection of frame number Temporarily select RA-160EC from the Tm and Nm values. 1,475N-m < 1,568N-m, 15.6r.p.m. < 27r.p.m. Rated torque of RA-160EC Calculation of life 10 15 1,568 Lh = 6000 x x 3 = 7,073Hr 15.6 ( 1,475 ) 7,073 > 5,000 Required life Examine the maximum output speed 20r.p.m. < 27r.p.m. Maximum allowable output speed of RA-160EC [Continuous] Maximum allowable output speed of RA-160EC Examine the acceleration/deceleration torque Tmax = T1 = 2,500N-m < 3,920N-m Allowable acceleration/deceleration torque of RA-160EC Examine the emergency stop and external impact torque Tem = 7,000N-m < 7,840N-m Momentary maximum allowable torque of RA-160EC 10 5 1,568 ( ) 3 775 x 7,000 Cem = =1696 times 20 40 x x 0.05 60 150 times < 1696 times Mc Allowable moment (Mo) Determine the model END YES NO Actual applied speed (2) Examine the main bearing capacity External load conditions W1 = 3,000N L1 = 500mm W2 = 1,500N L2 = 200mm Examine the thrust load 1,500N < 14,700N Maximum thrust load of RA-160EC Examine the load moment (RA-160EC) (201.8 + 500) + 1,500 x 200 Mc = 3,000 x 1,000 1,000 = 2,405.4N-m 2,405.4N-m < 3,920N-m Allowable moment of RA-160EC RA-160EC is selected (All conditions are met) 13

Engineering Notes 1. Installation of the reduction gear and mounting it to the output shaft When installing the reduction gear and mounting it to the output shaft, use hexagon socket head cap screws and tighten them with the torque as specifi ed below, in order to satisfy the momentary maximum allowable torque, which is noted in the rating table. Employment of the Belleville Spring Washer is recommended to prevent the hexagon socket head cap screws and protect their seat surface from fl aws. (1) Bolt tightening torque and tightening force Hexagon socket head cap screw Nominal size x pitch Tightening torque (N-m) Tightening force F (N) Bolt specifi cations M5 x 0.8 9.01 ± 0.49 9310 Hexagon socket head cap screw M6 x 1.0 15.6 ± 0.78 13180 JIS B 1176 M8 x 1.25 37.2 ± 1.86 23960 Strength class M10 x 1.5 73.5 ± 3.43 38080 JIS B 1051 12.9 M12 x 1.75 128.4 ± 6.37 55100 Thread M14 x 2.0 204.8 ± 10.2 75860 JIS B 0205 6g or class 2 M16 x 2.0 318.5 ± 15.9 103410 Note: 1. The tightening torque values listed are for steel or cast iron material. 2. If softer material, such as aluminum or stainless steel, is used, limit the tightening torque. Also, pay attention to the system requirements of the transmission torque. (2) Calculation of allowable transmission torque of bolts. T Allowable transmission torque by tightening bolt (N-m) F Bolt tightening force (N) T = F x D x 10-3 2 x μ x n D μ Bolt mounting P.C.D (mm) Friction factor μ=0.15... When grease remains on the mating face μ=0.20.. When grease has been removed from the mating face n Number of bolts (pcs) (3) Serrated lock washer for hexagon socket head cap screw Name : Belleville Spring Washer (made by Heiwa Hatsujyo Industry Co., Ltd.) Corporation symbol : Bell SW-2H (nominal size) Material : S50CM to S65CM Hardness : HRC40 to 48 (Unit: mm) Normal size ID and OD of Belleville Spring Washer d D Basic size 5 5.25 8.5 0.6 0.85 6 6.4 10 1.0 1.25 8 8.4 13 1.2 1.55 10 10.6 16 1.5 1.9 12 12.6 18 1.8 2.2 14 14.6 21 2.0 2.5 16 16.9 24 2.3 2.8 t H 14 Note: When using any equivalent washer, select it with special care given to its outer diameter.

2. Mounting the input gear The following is a representative case for connecting an input gear to a servo motor shaft. (1) For straight shaft (with key) (2) For straight shaft (without key) (1) Input gear Key (2) Hexagon socket head cap setscrew (4) Hexagon socket head cap screw (3) Wedge friction coupling (2) Plate B * (1) Input gear A * Enlarged view Motor shaft Motor shaft (3) For 1/10 tapered shaft * Adjust the deviation of A at the edge of the input gear to 70μm or less against B on the motor mounting pilot diameter. (2) Draw nut Woodruff key (1) Input gear Bolt width (4) Seal washer (3) Hexagon socket head cap screw Motor shaft 3. Notes when assembling an input gear (1) Remove the cap when assembling an input gear. Detailed diagram of this product at the time of delivery Cap 15

(2) Insert the input gear directly downward with the reduction gear held vertical. If the reduction gear is in a horizontal state, grease will run out from the input gear insertion area. After inserting the input gear, remove one of the hexagon plugs (one of two) from the grease filling and discharging hole to release the increased pressure inside the reduction gear, and then re-wrap the sealing tape to re-install the gear. At that time, tighten the hexagon plug (PT1/8) with a tightening torque of 12.3 N-m. Correct insertion position Servo motor Wrong insertion position Servo motor Grease filling and discharging hole Grease runs out (3) RA-20E and 40E have two spur gears. Please remember this particularly when assembling the input gear. If the input gear does not align with the spur gears, insert the input gear while changing the angle a little toward the circumference. Then, without tilting the input gear, make sure there is no gap between the mounting surfaces. At this time, do not tighten the input gear with bolts or the like. If the fl ange surface is tilted, it may be in the state shown in the fi gure below. Correct insertion position Wrong insertion position 4. Lubrication The standard lubrication method for the RA reduction gears is greasing. Before the reduction gear is shipped, it is fi lled with our recommended grease (VIGO GREASE RE0). When operating a reduction gear fi lled with the appropriate amount of grease, the standard replacement time due to deterioration of the grease is 20,000 hours. When using the gear with deteriorated grease or under an inappropriate ambient temperature condition (40ºC or more), check the deterioration condition of the grease and determine the appropriate replacement cycle. Specifi ed grease name 16 Grease name VIGOGREASE RE0 Manufacturer Nabtesco Corporation Ambient temperature -10 to 40ºC

Amount of grease in the reduction gear Models RA-EA Series Required input amount Horizontal shaft installation Vertical shaft installation (1) Vertical shaft installation (2) cc (g) cc (g) cc (g) RA-20EA 86 (75) 85 (74) 71 (62) RA-40EA 169 (147) 167 (145) 148 (128) RA-80EA 381 (331) 383 (333) 324 (281) RA-160EA 655 (570) 656 (571) 647 (563) RA-EC Series RA-20EC 169 (147) 163 (142) 176 (153) RA-40EC 299 (260) 264 (230) 309 (269) RA-80EC 473 (412) 427 (371) 439 (382) RA-160EC 689 (599) 546 (474) 690 (600) Note: After replacement, fi ll the reduction gear with the required amount of our recommended lubricant. If it is fi lled excessively, however, the internal pressure increases and the oil seal may be damaged. Greasing position Horizontal shaft installation Rotation For grease filling and discharging Vertical shaft installation (1) Servo motor Grease position Servo motor For grease filling and discharging Grease position For grease filling and discharging Rotation For grease filling and discharging Vertical shaft installation (2) For grease filling and discharging Grease position Rotation For grease filling and discharging Servo motor 17

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Appendix 1 Quick Selection Table of Product Codes 19

Quick Selection Table of Product Codes [How to select] For example, an order item number, when the RA-40EA-120 is used with the servo motor xx/xxxxx that has a straight shaft (with key), can be selected as described below. (1) Refer to the relevant Quick Selection Table. (Ex.: RA-EA Series & Straight shaft (with key)) (2) The order item number will be found in the box, where the columns of the servo motor xx/xxxxx and RA-40 EA-120 are crossed, as in the directions of arrows in the table below. (3) Order using the selected order item number (Ex.: 31RA003B). Note: 1. If the value achieved, by multiplying the momentary maximum torque of the motor by the speed ratio and effi ciency of reduction gear, exceeds the momentary maximum torque of the reduction gear, or always exceeds the allowable acceleration/deceleration torque, then restrict the motor torque. 2. The total length of the selected product is the value achieved by adding the total length of the outside dimension drawing (of the reduction gear) and dimension D of the outside dimension drawing (of the motor fl ange). 3. The inertia moment I includes the values for both the reduction gear and the input gear. 4. The matching verifi cation between the reduction gear and the motor in this quick selection table should be used as a reference; this is because they are matched based only on the torque comparisons during operation of the reduction gear. For a more precise motor selection, the effective torque, load inertia moment, brake torque, and regene-rative ability, and so forth, must also be considered. 20

Quick Selection Table of Product Codes RA-EA Series RA-EA Series (Case rotating type) Quick Selection Table of Produkt Codes 21

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RA-EA Series Quick Selection Table of Product Codes Note: 1. Use the Order item number for your order. 2. If the value achieved, by multiplying the momentary maximum torque of the motor by the speed ratio and effi ciency of reduction gear, exceeds the momentary maximum torque of the reduction gear, or always exceeds the allowable accele-ration/deceleration torque, then restrict the motor torque. 3. The total length of the selected product is the value achieved by adding the total length of the outside dimension drawing (of the reduction gear) and dimension D of the outside dimension drawing (of the motor fl ange). 4. The inertia moment I includes the values for both the reduction gear and the input gear. 5. The matching verifi cation between the reduction gear and the motor in this quick selection table should be used as a reference; this is because they are matched based only on the torque comparisons during operation of the reduction gear. For a more precise motor selection, the effective torque, load inertia moment, brake torque, and regenerative ability, and so forth, must also be considered. 23

Note: 1. Use the Order item number for your order. 2. If the value achieved, by multiplying the momentary maximum torque of the motor by the speed ratio and effi ciency of reduction gear, exceeds the momentary maximum torque of the reduction gear, or always exceeds the allowable accele-ration/deceleration torque, then restrict the motor torque. 3. The total length of the selected product is the value achieved by adding the total length of the outside dimension drawing (of the reduction gear) and dimension D of the outside dimension drawing (of the motor fl ange). 4. The inertia moment I includes the values for both the reduction gear and the input gear. 5. The matching verifi cation between the reduction gear and the motor in this quick selection table should be used as a reference; this is because they are matched based only on the torque comparisons during operation of the reduction gear. For a more precise motor selection, the effective torque, load inertia moment, brake torque, and regenerative ability, and so forth, must also be considered. 24

Quick Selection Table of Product Codes RA-EC Series RA-EC Series (Shaft rotating type) Quick Selection Table of Produkt Codes 25

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RA-EC Series Quick Selection Table of Product Codes Note: 1. Use the Order item number for your order. 2. If the value achieved, by multiplying the momentary maximum torque of the motor by the speed ratio and effi ciency of reduction gear, exceeds the momentary maximum torque of the reduction gear, or always exceeds the allowable accele-ration/deceleration torque, then restrict the motor torque. 3. The total length of the selected product is the value achieved by adding the total length of the outside dimension drawing (of the reduction gear) and dimension D of the outside dimension drawing (of the motor fl ange). 4. The inertia moment I includes the values for both the reduction gear and the input gear. 5. The matching verifi cation between the reduction gear and the motor in this quick selection table should be used as a reference; this is because they are matched based only on the torque comparisons during operation of the reduction gear. For a more precise motor selection, the effective torque, load inertia moment, brake torque, and regenerative ability, and so forth, must also be considered. 27

Note: 1. Use the Order item number for your order. 2. If the value achieved, by multiplying the momentary maximum torque of the motor by the speed ratio and effi ciency of reduction gear, exceeds the momentary maximum torque of the reduction gear, or always exceeds the allowable accele-ration/deceleration torque, then restrict the motor torque. 3. The total length of the selected product is the value achieved by adding the total length of the outside dimension drawing (of the reduction gear) and dimension D of the outside dimension drawing (of the motor fl ange). 4. The inertia moment I includes the values for both the reduction gear and the input gear. 5. The matching verifi cation between the reduction gear and the motor in this quick selection table should be used as a reference; this is because they are matched based only on the torque comparisons during operation of the reduction gear. For a more precise motor selection, the effective torque, load inertia moment, brake torque, and regenerative ability, and so forth, must also be considered. 28

Cautions for use of RA Series If the end user of this product is a military interest or the product is to be used in the manufacture of weapons, the product may be subject to export regulations prescribed in the Foreign Exchange and Foreign Trade Control Law. Confirm these conditions before exporting the product and take the necessary steps. When using this product with devices (nuclear facilities, aerospace equipment, transportation equipment, medical equipment, safety devices, etc.) that may directly affect the human body or endanger human life due to an operational malfunction or failure, examination of individual situations is required. In such a case, contact an agent or our nearest business office. Although this product has been manufactured under strict quality control, if it is to be used in equipment that could cause serious injury or damage to facilities as a result of failure of the product, all appropriate safety measures must be taken. When this product is used in a special environment (clean room, food handling facilities, etc.), please contact an agent or our nearest business office. Guarantee Nabtesco Corporation guarantees that the RA Gearheads are free from defects in materials and workmanship. The term of guarantee shall be one year after delivery or 2,000 hours of operation after the installation on an actual machine, whichever is earlier, on condition that the product is operated under the rated operation conditions specified by us, and under normal assembly and lubrication conditions. If any defect in the materials or workmanship is detected during the above guarantee term, the product will be repaired or replaced at our expense, provided that the number of man-hours required for demounting and remounting the product from the machine, transportation expenses for re-delivery, warehousings and other incidental expenses shall be excluded from our obligation. No compensation will be provided for the lost opportunities or any other type of loss due to a shutdown of operation that was caused by a defect in the product. If compensation under the guarantee is discharged monetarily, the upper limit of the amount shall not exceed the selling price of the product which is the subject of the claim. If any of the applicable units are disassembled/reassembled without prior notification to us, we shall not be held responsible for any problems related to performance or safety, etc. that result from their subsequent usage.

Rev. 002 In North and South America Nabtesco Motion Control Inc. 28850 Cabot Drive, Suite 300, Novi, MI 48337 PHONE: 1-248-553-3020 FAX: 1-248-553-3070 E-MAIL: info@nabtescomotion.com Home Page: www.nabtescomotion.com In Europe and Africa Nabtesco Precision Europe GmbH Klosterstraße 49, D-40211 Düsseldolf, Germany PHONE: 49-211-173790 FAX: 49-211-364677 E-MAIL: info@nabtesco-precision.de HomePage : www.nabtesco-precision.de In Asia Tokyo Head Office 1-9-18 Kaigan Minato-ku, Tokyo 105-0022, Japan PHONE: 81-3-3578-7461 FAX: 81-3-3578-7471 E-MAIL: P_Information@nabtesco.com Tsu Plant 594 Ichimachida, Katada-cho, Tsu-shi, Mie Pref. 514-8533, Japan PHONE: 81-59-237-4600 FAX: 81-59-237-4610 www.nabtesco.com v Specifications are subject to change without notice. CAT. 080531