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<p>a high-precision ball joint consisting of a spherical outer and inner race separated by ball bearings. The ball bearings are housed in a spherical retainer and roll along both the inner and outer surfaces.  This design allows the joint to have very low friction while maintaining a large range of motion and backlash as low as 1&nbsp;<a href="page.php?w=um">um</a>. SRJs are often used in parallel robotics applications like a <a href="page.php?w=Stewart_platform">Stewart platform</a>, where high rigidity and low <a href="page.php?w=backlash_%28engineering%29">backlash</a></p><p>
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