With the robolink® joint modular system, igus® enables the individual assembly of low-cost robots for the most varied applications. The new rotary-drive unit enables precise manual adjustment of the components. It can be pivoted and rotated using lubrication-free gears. Two adjusting wheels can be used to adjust instruments or devices. The new rotary-drive unit is used where devices require precise adjustment allowing consistent and reliable application operation. The manual adjustment is also advantageous when electrical operation is not possible.