The compact HCDS-051-051 series of eight linear open-aperture voice coil stages have a footprint of 10.5 in (266.7 mm) long x 4 in (101.6 mm) wide x 3.755 in (95.4 mm) high. Linear dc motor driven-stages (also known as moving coils) are clean, quiet and efficient, with low inertia, high acceleration and high speed. Designed for closed-loop servo operation, an integral quadrature optical encoder with differential outputs is included. Each stage has a built-in home switch for accurate initialization upon power-up, precision-threaded mounting holes for tooling or fixtures and a linear travel of 0.7 in (17.8 mm).