RA
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Precision Reduction Gear RV High Precision Gearhead

Contributing to society with our ‘Moving it. Stopping it.’ technologies Nabtesco's technologies supporting society Nabtesco manufactures products which are used in everyday life. Our high-accuracy components are essential for moving objects; they may be rarely visible, but are the foundation of everyday objects that you see moving and wonder how. Nabtesco’s technologies are found throughout objects that move and stop people’ s lives. Do or s Ro bo ts Precision reduction gears precisely move and stop industrial robots. Co ns tru cti on ma ch ine ry Running motors and control valves start and...

CONTENTSWho is Nabtesco? The key words for Nabtesco are ‘motion control'. We use our strengths in the fields of component and systems technologies to develop highly creative products. Through the Nabtesco Group as a whole, we can also utilize our advantage of expertise to maximum effect in order to further enhance these strengths. In the air, on land and at sea, we have a leading share in various fields of both international and domestic markets. Nabtesco will continue to evolve by utilizing its strengths in many fields and by exploring the possibilities of the future. April 2002 Initiation...

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

RA Series characteristics and structure High reliability 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. 1. Compact design with a reduced number of Two benefits parts Warranty due to the 2....

Examples of uses for the RA Series For machining center ATC magazine drive Cam drive for ATC arms Rotary table Contact us for NT Series rotary tables.

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

Principle of operation 1. Rotation of the servomotor is transmitted through the Fig. 1. First reduction section input gear to the spur gears, and the speed is reduced according to the gear ratio between the input gear and the spur gears. 2. Since the crankshafts are directly connected to the spur gears, they have the same rotational speed as the spur gears. Spur gear 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.) 4. When the crankshafts rotate, the two RV gears...

Model code RA-EA Series (Case rotating type) RA-EC Series (Shaft rotating type)

Note: 1. The rating table shows the specification values of each individual reduction gear. 2. The allowable output speed may be limited by heat depending on the operating rate. Make sure that the surface temperature of the reduction gear does not exceed 60°C during use. 3. For the inertia moment of the reduction gears, refer to the Product Summary Sheet. 4. When the reduction gear is used at low temperatures, there will be a larger no-load running torque. Note this characteristic when selecting a motor. (Refer to “Low temperature characteristics” on page 32) 5. The allowable moment will...

Specifications and dimensions are subject to change without notice. External dimensions Reduction gear main unit

M 1H Specifications and dimensions are subject to change without notice.

Specifications and dimensions are subject to change without notice.

Input gear External dimensionsStraight shaft (with key) Model

The asterisk (*) at the end of the order item number will be replaced with our revision number. It is subject to change without notice. The drawing above shows a representative model. The actual model may differ from the drawing. 15

Threaded portion

External dimensions Motor flange Tapped hole for hanging bolt M8×14 (Flange mounting hole) 4 - ØH ØJ counterbore Motor flange code Order item number Flange outer dimensions (mm) ØA C D ØE (Tapped hole for motor mounting) 4 - Nominal P × Depth Q The asterisk (*) at the end of the order item number will be replaced with our revision number. It is subject to change without notice. The drawing above shows a representative model. The actual model may differ from

(Tapped hole for motor mounting) 4 - Nominal P × Depth Q Tapped hole for hanging bolt M8×14 Square type (Flange mounting hole) 4 - ØH ØJ counterbore Motor flange code Order item number Flange outer dimensions (mm) ØA C D ØE □B The asterisk (*) at the end of the order item number will be replaced with our revision number. It is subject to change without notice. The drawing above shows a representative model. The actual model may differ from the d

Technical Information

Considering the use of the RA Series This product features high precision and high rigidity, however, it is necessary to strictly comply with various restrictions and make appropriate to maximize the product’s features. Please read this technical document thoroughly and select and adopt an appropriate model based on the actual operating environment, method, and conditions at your facility. Export • When this product is exported from Japan, it may be subject to the export regulations provided in the “Foreign Exchange Order and Export Trade Control Order”. Be sure to take sufficient...

Glossary Rated service life Torsional rigidity, lost motion, backlash The lifetime resulting from the operation with the rated torque and the rated output speed is referred to as the “rated service life”. When a torque is applied to the output shaft while the input shaft is fixed, torsion is generated according to the torque value. The torsion can be shown in the hysteresis curves. 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...