Robotics demands lightweight, stiff and repeatable parts. Here is what matters when you source CNC components for robot arms, end-effectors and drivetrains.
From joint brackets and housings to harmonic-drive flanges and sensor mounts, machined parts define the stiffness and repeatability of every axis. A 0.02 mm error in a bracket hole pattern can translate into measurable end-effector drift over a long reach.
Aluminium 7075 keeps arms light; stainless 316L survives labs and cleanrooms; PEEK and acetal cut weight and electrical noise in sensor-rich zones. Match the material to the duty cycle, not the catalogue.
Focus tight tolerances on datums, bearing seats and bolt circles. Holding ±0.01 mm on a non-functional face only adds cost. Agree the datum scheme (3-2-1) up front so machining and inspection speak the same language.
First-article CMM reports plus SPC on recurring batches catch drift before it ships. For motion-critical parts, ask for runout and concentricity on the report, not just diameter.
7075-T6 for maximum stiffness-to-weight; 6061-T6 when weldability or anodising colour matters more than peak strength.
First article always; for recurring production use SPC on critical dimensions so you catch tool wear early.