HIGH ACCURACY AND HIGH RIGIDITY BALLSCREW ACTUATOR

BALLSCREW ACTUATORS A ballscrew actuator of KURODA is a compact single-axis unit consisting of a ball screw and a slide guide. With its slide block set in U-guide rail, the actuator has achieved low-profile design and compact shape, making it possible to considerably reduce necessary space as compared with the usual table type structure. Despite of its compact structure, the actuator with U-guide rail shows high rigidity against bending moment and deflection, and it can be applied to a structure supported by one end. The linear motion unit, which is gothic arched and in 4 points-contact structure,...

FEATURES OF SG/SE SERIES Ball screw and slide guide are integrated in ballscrew actuator, eliminating the need for complicated fine adjustment and reducing the number of working processes to a great extent. With U-guide rail, rigidity of ballscrew actuator has remarkably improved despite of its compact structure, making it possible to be applied even to a structure supported at only one end. Linear motion unit uses "4 or 2 Ballway of 4 points-contact" struc- ture to assure high rigidity. Guide rail, slide block and ball screw shaft are precisely worked, making accurate positioning possible. Gothic...

(Note 1) Stainless steel is used for tension bolts and nuts. (Note 2) Anti corrosive black coating of pulley cover applies to SE and SC

FEATURES OF SC SERIES (FULL-COVER TYPE) Full-cover type SC series, built on KURODA SE series, has remarkably improved its dust-preventive performance. Structure Coupling cover „. , Table Center sheet , Motor bracket Guide rail Remarkably improved dust prevention! Compared to SE series with dustproof cover, dust prevention has been remarkably improved through making clearance on side face of actuator as narrow as it can be and effectively applying new center sheet designed to straddle the tables, so as to prevent entry of dust. Center sheet is a flexible stainless sheet having a structure Sneet...

KEY COMPONENTS AND MATERIALS OF SO SERIES (Note 1) Ball screws used for SC series have the same specifications as SE series. (Note 2) Stainless steel is used for bolts and screws to joint components of actuator.

VARIATIONS OF SLIDE BLOCK Two types of actuator with long block and short block are available. Additional types with either 2 long blocks or 2 short blocks are also available. Appropriate type can be selected from the variations according to your purpose of use. • With 1 long block: A Mounting datum surface Grease nipple mounting position With 2 long blocks: B Applied to SG and SE series. (Not available for SC series.) This configuration may not be applicable depending on guide rail length For more information, refer to dimensions of each series. Mounting datum surface Grease nipple mounting...

SUMMARY OF ACCURACY INDICATORS Performance of ballscrew actuators are shown using various accuracy indicators described below. For details in tolerance of the accuracy indicators, refer to table of performance (accuracy) information for each series. • Repeated positioning accuracy Repeat positioning of slide block in the same direction 7 times, measure stop position of slide block and halve maximum difference between obtained readings. Perform this measurement at the cen- ter and both ends of travel distance. Maximum value among obtained value is used as measured value. Repeated positioning accuracy...

REFERENCE DATA ON ACCURACY ACCURACY OF UNIT PRODUCT • Lost Motion Perform positioning in a positive (or negative) direction and mea- sure the position (d). Move the slide block in the same direction and perform positioning in a negative (or positive) direction and measure the position (C). Move it further in the same direction and thereafter repeat the procedure in the positive and negative direc- tions seven times each. Obtain the differences of the average val- ues of the stop positions. Conduct this measurement for the entire moving range and use the obtained maximum value as a measured In...

REFERENCE DATA ON ACCURACY ACCURACY OF UNIT PRODUCT In case squareness cannot be measured on the table top: Set a dial gauge on the table top. On surface plate close to the table travel range, fix a square gauge in parallel to X (or Y) travel Place a fix indicator against the side of square gauge parallel to Y (or X) travel direction. The maximum reading value of the dial gauge in the entire travel range is a measured value of squareness. Surface plate Square gauge In case squareness can be measured on the table top: Set a dial gauge on surface plate. On the table top, fix a square gauge in parallel...

Linear motion units of SG, SE, and SC series, having gothic-arched grooves and 4 points-contact structure on guide rails and slide blocks, have attained high rigidity. Displacement by each radial load in each size with long block configuration is shown below as a ref- Gothic arch shape Osplacement of Slide block by Radial Load SE/SC series (Radial play Oyum)

OPTION AND MANUFACTURING BY ORDER O: Option —: Not available •: Manufactured by order (Note 1) RO type bracket is applied to SG series and RN type is applied to SE and SC series. (Note 2) Full-cover type with wiper and with grease nipple is applied only to SC series. (Note 3) Anti corrosive black coating (film thickness 1 -2//m) is provided as surface treatment. For other types of surface treatment, consult KURODA. (Note 4) Grease filler hole for SG and SE series is applied to the configuration with sub-table. (Note 5) Any grease application other than standard or option grease applications will...

• Asterisked (*) item in the above table applies only to performance grade H. • For long rail configurations, please consult KURODA. © Performance of ballscrew actuators, including various positioning accuracy indicators and traveling parallelism For more information on accuracy, refer to a table of accuracy information for each series. © Motor bracket configuration Intermediate flange may be used in combination with basic configuration. For more information, refer to a table of motor bracket configurations and motor option for each series. For more information, refer to dimensions of each series....