The Rebel-S6 family is the modular concept Comau built for the small-robot market, and the argument is structural honesty: three reach sizes - 450, 600 and 750 mm, plus ceiling versions - all carrying 6 kg at 0.02 mm X-Y repeatability on a 20 kg arm, so a line mixes reaches without changing controller, tooling interface or spares.

Why a ball-screw spline on a SCARA?

Because the Z axis is where SCARAs wear out. The 20 mm ball-screw spline with 14 mm inner diameter routes user wiring and 1 x 4 mm plus 2 x 6 mm pneumatics internally, delivers 160 N of long-time downforce for press-fit operations, and keeps the whole arm at 20 kg - light enough for wall or ceiling mounting on the 0.75c version.

Small robot or ecosystem entry?

Entry with credentials: the R1C-4 controller, IP10 sealing with an IP54 option and 5 to 95 percent humidity tolerance put the Rebel-S6 in real production corners, and the family logic extends upward - handling, assembly and machine tending applications graduate into Comau robot team solutions when payloads outgrow 6 kg. Against entry SCARAs from dedicated small-robot makers, the Rebel-S6 argues the Comau industrial network behind it - eleven countries of integration support for a robot that costs like a component.