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Overview
Features
Typical Applications
Specifications
Downloads
Related Products
RA Series
Overview
Rollerdrive RA Series
The RA Series is a zero-backlash reducer designed for small to medium-size FA applications. It delivers high accuracy, rigidity, and speed.

The RA is suitable for equipment that demand motions with a high level of accuracy and speed.
RollerDrive CNC Technology
* Note:
· Delivery is based on official business days for Sankyo.
· Not applicable for certain specifications.
· Applicable up to five units of the same model. Contact Sankyo if ordering more than five units.

 

Features

Zero Backlash
The RollerDrive uses a unique preload mechanism to completely eliminate backlash and deliver output motions that are faithfully true to input commands.
Positioning accuracy is particularly good with direction reversing motions.
Highest Level of Accuracy in the RollerDrive Series
Delivers good positioning accuracy and runout accuracy, which are otherwise difficult qualities to attain with a small reducer.
High Rigidity
The output shaft is a solid-piece cross roller bearing designed for durability against axial and radial loads.
High Speed
Max output speed 150 rpm (200 rpm for the RA40)
Choice of Motors
Dedicated fittings are available for mounting motors from various manufacturers.
High Efficiency, Direct Drive
Motor couples directly to the input shaft for a direct transfer of power with less transfer loss.
Lightweight, Compact
Features a compact aluminum-alloy housing for minimal footprint.
Typical Applications
Specifications
The performance of the RA Series depends on the lubrication system. The unit may have the standard grease lubrication system or the high-speed oil lubrication system. Which system is used depends on the user requirements. To determine whether the lubrication system chosen by Sankyo meets your application, make sure the unit is capable of operating under the conditions that satisfy our life expectancy values. This can be confirmed with the dynamic rated torque graph. The speed and torque must fall within the range highlighted in this graph.
Grease Lubrication
* Made to order.

Model RA40 RA63 RA80 RA100 RA125
Gear Ratio 15 20 20 30* 20 30* 20 30*
Max Torque for Starts/Stops N·m 57.7 129.3 202.3 147.9 564.8 250.3 938.6 637.5
Maximum Allowable Input Speed rpm 3,000 2,500 2,000 1,600
Allowable Mean Input Speed rpm 900 800 700 600
Positioning Accuracy Max arcsec 90 60 40
Repeatability Max arcsec ±10 ±7 ±5
Surface Runout Max µm 10
Allowable Axial Load N 999 1,657 3,302 3,724 8,178
Allowable Radial Load N 669 1,359 2,819 3,109 7,452
Allowable Moment Load N·m 33 79 210 284 764
Product Weight kg 2.5 5.6 11.6 21.5 36.3
Oil Lubrication
* Made to order.

Model RA40 RA63 RA80 RA100 RA125
Gear Ratio 15 20 20 30 20 30 20 30
Max Torque for Starts/Stops N·m 71.0 159.2 249.0 182.1 695.4 308.2 1,155.6 784.8
Maximum Allowable Input Speed rpm 3,000
Allowable Mean Input Speed rpm 1,300 1,100 1,000 900
Positioning Accuracy Max arcsec 90 60 40
Repeatability Max arcsec ±10 ±7 ±5
Surface Runout Max µm 10
Allowable Axial Load N 999 1,657 3,302 3,724 8,178
Allowable Radial Load N 669 1,359 2,819 3,109 7,452
Allowable Moment Load N·m 33 79 210 284 764
Product Weight kg 2.5 5.6 11.6 21.5 36.3
Operating Precautions
Do not operate the RollerDrive under conditions where the surface temperature may rise above 60℃. Operation under high temperatures can degrade lubrication oil.
Downloads
>> Download the Rated Transfer Torque Capacity Table for rated torque values.
Product Catalogs
Outline Dimensions
2D-CAD Data
3D-CAD Data
Related Products
>> RE Series
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General-purpose, wide range of sizes
>> RM Series
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All-in-one model.
For heavy inertia loads
>> DT/DTR /Series
SANDEX rotary indexer
Hollow table output,
multi-stop indexing

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