Dobot CR3A

CR3A is the entry point to Dobot's CRA generation and the arm the company puts on benchtops: 16.5 kg of machine carrying 3 kg within a 620 mm working radius, drawing 120 W. It is also, together with the CR5A and the long CR6AL, the most precise arm in the family at +/-0.02 mm repeatability - two and a half times tighter than the 20 and 30 kg flagships. Its wrist joints run at the series maximum of 223 deg/s, but its maximum linear speed of 3 m/s is the lowest here, which is the honest trade for a short arm. Common to the CRA series: six rotary axes, a stand-alone safety controller rated PLd Cat.3 with more than twenty safety functions, certification to ISO 13849-1, ISO 10218-1 and ISO/TS 15066, laser calibration giving absolute positioning accuracy under 0.4 mm, an electromagnetic brake that engages within 18 ms and holds position within 1 mm on power loss, 24 digital inputs and outputs with both PNP and NPN switching, and Modbus TCP/RTU, EtherNet/IP and PROFINET as standard. The arm runs DobotStudio Pro; a 10.1-inch teach pendant, the SafeSkin proximity layer (15 cm pre-collision sensing, 0.01 s monitoring, 0.1 s response) and the VX500 five-megapixel smart camera are optional. Dobot rates the joints of this generation at up to 223 deg/s and claims a 25% shorter cycle time than the previous CR series. Two inconsistencies in Dobot's own published data are worth recording rather than hiding. The series comparison table gives this family maximum linear speeds of 3 to 5.5 m/s, while the CR20A product page puts maximum TCP speed at 2,000 mm/s - a gap of nearly threefold that the manufacturer does not explain. And in the same comparison table the ingress-protection row for the two largest models displays a repeatability figure instead of an IP rating; the CR20A product page states IP54 for both arm and control box, which is what this catalogue publishes.

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