Miniature LM Guide Actuators Featuring Caged Ball Technology Caged Ball Technology Offers Long life and long-term, maintenance-free operation 8 w^Jmm Ê^jG^ Excellent high speed performance % Pimi ■ ^ m\Jm m Excellent Sliding Smooth Motion Capability TOKYO. JAPAN

Inner block Ball screw shaft Outer rail Caged ball Fig. 1 Construction of SKR-type LM Guide Actuator with Caged Ball Technology The SKR-type LM guide actuator with Caged Ball Technology is a compact actuator that places an inner block(s) with integrated LM block and ball screw nut onto the inside of the U-shaped outer rail. Caged ball technology in the LM guide sections and QZ lubricator in the ball screw sections are integrated in the design. The SKR20/26-type LM guide actuator assures excellent sliding, higher speed, longer maintenance-free operation and other features in comparison with the...

The linear motion guide raceway has four rows of circular arc grooves that provide smooth motion under pre-load, delivering clearance-free guida- nce with high rigidity against moment and tor- sion. In addition, changes in frictional resistance resulting from load variations are minimized, al- lowing the SKR-type to achieve high-precision Rolling center of a ball Fig.4 Contact Structure of SKR-Type The integration of a miniature LM guide and a miniature ball screw allow the SKR20/26-type to achieve high rigidity and high precision in a mini- Fig.5 Cross Section of SKR-Type 5. Long Life Span and...

Rated Loads Notes: The rating of the LM Guide is the rated load per Inner block. Accuracy Standard

• Permissible Static Moment / Equivalent Moment Factor Note: The values for models SKR-B indicate the values when two blocks are used in close contact with each other. Note:KA: moment equivalent coefficient in the MA direction KB: moment equivalent coefficient in the MB direction Kc: moment equivalent coefficient in the Mc direction • Maximum Travel Speed The SKR-type is compatible with the latest high-speed rotational AC servo-motors (6000 min1) Moreover, the lineup of the 6-mm lead type allows a higher feed rate. The maximum manufacturing length is shown as the outer rail length. Note: Maximum...

The precision of the SKR is determined by positioning repetitive repeatability, positioning accuracy, backlash, and running » Positioning Repetitive Repeatability After repeating positioning to a given point in the same direction seven times, measure the halting point and obtain the value of half the maximum difference. Perform this measurement in the center and both ends of the travel distance, use the maximum value as the measurement value and express the value of half the maximum difference with symbol "±" as positioning repeatability. Positioning Accuracy The positioning accuracy is expressed...

O How to Interpret the Model Number Q Model number pj Ball screw lead [mm] H Type of inner block Q Outer rail length [mm] El Accuracy grade El Presence/Absence of a motor B Presence/Absence of a cover El Sensor specifications EjType of Motor bracket (housing-A, intermediate flange) (See page 13) ¡0 Control number

SKR20 ǢǢǢ Standard Specifications SKR20 ǢǢ A (with a single long block) SKR20 ǢǢ B (with two long blocks) L1 49 Outer rail length 10 46 (44.6*) 14 8.5 8 6 33.2 18 4h7 20 4-M3 depth 3 2-M2.6 depth 4 12 2-M1.6 depth 2.4 25 12 10 2 × n-3.4 through hole 6.5 counter bore depth 3 46MIN (Dimension with two inner blocks in close contact) 10 A 0.9 20h7 B 2 × M2.6 depth 4 (Same position on the opposite side) B 60 G 3.5 (G) (n-1) × 60 39.6 4-M3 depth 6 33.6 13 2 15.8 20 30° 0.5 D2 9 PC 3.3 9.5 30 29.5 30° 23 4-3.4 through hole 11 18 40 View A Section B-B *: Block length for calculating available stroke...

C SKR20 □□ A (with a single long block) ^ Q SKR20 □□ B (with two long blocks) )

C SKR26 □□ A (with a single long block) ) Q SKR26 □□ B (with two long blocks) ) Outer rail length 2-M2 depth 3 2 x n-4.5 through hole ^8 counter bore depth 4 *: Block length for calculating available stroke length. Block length of SKR26DDB (with two blocks) is 126.8 mm.

C SKR26 □□ A (with a single long block) ^ Q SKR26 □□ B (with two long blocks) )

The SKR is equipped with an end seal and side seal as standard for dust-proofing. Proximity sensors and photosensors are available as options for the SKR20 and SKR26. When a customer specifies a model with a sensor, specially designed sensor rails and sensor dogs are supplied with the product. It is also possible to install a sensor rail only.

Proximity sensors APM-D3A1-001 APM-D3B1-003 (YAMATAKE)

• Applicable Motors and Applicable Intermediate Flanges The SKR-type is provided with intermediate flanges so that a variety of motors can be installed. The table below shows the control number of the intermediate flanges meeting the applicable motors on a model number basis. At the time of order, specify the intermediate flange control number. Note 1 : Symbols in the SKR type columns show the lower two digits of the intermediate flange control numbers. Note 2: Please contact THK regarding the coupling when installing motors in the above table. O Dimensions of the Intermediate Flanges * Intermediate...

O Dimensions of the Intermediate Flanges ^6.5 counter bore depth 3.5 (from the back side) - Intermediate flange model -Last two symbols of control No ^6.5 counter bore depth 7 through hole 0 6.5 counter bore depth 6.5 06 counter bore depth 3.5 (from the back side) 05 counter bore depth 4 (from the back side) ^--4-M2.6 through hole \4-M3 through hole 0 6.5 counter bore depth 3.5 (from the back side)

cFÜ=ílr3 Type SKR20/26 Miniature LM Guide Actuator with Caged Ball Technology Do not disassemble the product; doing so may result in the entry of foreign material or the decreased accuracy of the assembly. Handle the product carefully. Dropping or striking it may result in breakage. Applying shock to the product may result in functional damage even if the product appears to have no visible damage. Thoroughly wipe off the rust-preventive oil from the product and then fill it with lubricant before use. Do not mix and use lubricants with different properties. If the product is to be used in locations...