An automatic screw feeder can greatly increase the efficiency of a manual screwdriving operation. However, to reach the next level of productivity, assemblers should consider a robot. Screwdriving is a great application for Cartesian, SCARA, six-axis robots and collaborative robots. Now, several suppliers have introduced robots for installing large screws and bolts. Here’s a look at some of the latest developments.
The ERS series of preconfigured robotic workcells from ESTIC America Inc. are designed for automatic installation of threaded fasteners. Two sizes of SCARA robot are available. The THE400 SCARA has a maximum reach of 485 millimeters and a Z axis stroke of 160 millimeters. The THL900 SCARA has a maximum reach of 1,000 millimeters and a Z axis stroke of 160 millimeters. The robot can be equipped with a Handy 2000 Micro nutrunner for fasteners ranging from M1.7 to M6 or a Handy 2000 Touch nutrunner for fasteners ranging from M3 to M12. The cells can be ordered with or without a linear actuator to move workpieces in and out. Alternatively, the cell can be configured to interface with a pallet-transfer conveyor. One controller governs both the nutrunner and the robot. This simplifies programming and reduces communication time. Tightening points can be taught by moving the robot directly. An optional vision guidance system automatically corrects misalignment of the tool with the fastening location. Z axis thrust control prevents workpiece overload and cam out during tightening. For more information, visit www.estic-global.com.