NEW LM Guide Actuators FeaturingCaged Ball Technology Caged Ball Technology Offers Long life and long-term, maintenance-free operation Excellent high speed performance Reduced variations in rolling resistance and low noise SKR > Catalog No. 309-3E size="-5">

Nut blockBall screw shaft Ball retainersBallsLM rail Axis YAxis X Center of gravity Unit:mm 4 ModelSKR33SKR465.35 > X l > Y Mass:m(kg/100mm) З 10 > 4 3.52 10 > 5 0.611.26l 2.05 ח 10 > 5 1.45 10 > 6 l > X = geometrical moment of inertia around axis Xl > Y = geometrical moment of inertia around axis Y >

SKR-A SKR-B SKR-C SKR-D This is the typical SKR model. This is the model in which two nut blocks of the SKR-Amodel are provided to achieve higher rigidity, higher load capacity, and higher precision. This is the model in which the full length of the SKR-Amodel nut block is shortened to have a longer stroke. Note that the SKR3320 model has no short type block. This is the model in which two SKR-C model nut blocksare provided. By placing two blocks, it achieves high ri- gidity within the application limits. Note that the SKR3320 model has no short type block. 5 >

P L P R The SKR-type LM guide actuators with Caged BallTechnology consist of the LM guide, ball screw,and support bearing. Table 4 shows the ratedloads. > P T P T LM guide section The SKR-type can carry loads in all directions, i.e., the radial, reverse-radial, and two lateral directions. Thebasic rated load is the same in these four directions and their values are shown in Table 4. > ? Ball screw section The SKR-type can carry loads in the axial direction since it incorporates a ball screw nut in the nut block. The basic rated load value is shown in Table 4. > ? Support bearing The SKR-type...

Table 6 Contact Factor (f ) > Types of Nut BlocksA/C Type B/D TypeContact Factor f C 1.00.81 Table 7 Load Factor (f W ) Vibration or ImpactVelocity (V)f W MinuteSmallMediumLargeFor crawling:V 0.25 m/sFor slow speed:0.25 < V 1.0 m/s For intermediate speed :1.0 < V 2.0 m/sFor high speed:V > 2.0 m/s1.0 to 1.22.0 to 3.51.5 to 2.01.2 to 1.5 Table 8 Moment Equivalent Coefficient (K) > K > A K > B K > C SKR33 - ASKR33 - BSKR33 - C SKR33 - DSKR46 - ASKR46 - BSKR46 - C SKR46 - D 1.42 > -1 1.42 10 > -1 5.05 ח 10 > -2 2.47 10 > -2 2.47 ח 10 > -2 5.05 10 > -2 2.39 ח 10 > -1 2.39 10 > -1 5.05 ח 10 > -2 3.54...

The precision of the SKR is determined by repetitive positioning accuracy, positioning accuracy, backlash, and travelingparallelism. > Repeat the measurement seven times from the samedirection to a certain point. Divide the maximum difference by two. Conduct the same test at three points, the centerӔof the stroke, and on both the approximate maximum andminimum positions of travel. Add > t 1 to the largest difference.This accuracy is generally measured with a laserinterferometer and sometimes with a dial-gauge.(Taken from THK Accuracy & Measurement Standards.) > t 2 t 3 Figure. 8 Repetitive Positioning...