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What is robot repeatability?

Industrial robots provide incredible repeatability. This is the ability of a robot to return to the same position. This repeated movement is measured over a period of time.

robot repeatability

Repeatability is an important element of robotic performance. Nearly every application requires good repeatability - from spot welding and plasma cutting to material handling. Repeatability is especially important when it comes to industries whose products require tight tolerances, such as aerospace or pharmaceuticals.

Repeatability and the Robot:
Simply put, the repeatability range is determined by a robot's size. Smaller robots tend to provide higher repeatability levels, whereas larger robots typically have lower repeatability. It comes down to the mechanical components - robots with finer gears are more capable of precise movements.    

RobotWorx' Repeatability Testing:
Repeatability testing is an important part of RobotWorx' reconditioning process. Robots are not deemed completely reconditioned until their repeatability fits the manufacturer's specifications for that individual robot model.

Repeatability tests begin by programming the robot to perform a specific cycle routine (see video above). A testing point is established and a digital dial indicator is hooked up to it. Then, the robot is run through its paces for 8-40 hours. A PC generates a spread sheet and the repeatability range is known.

Repeatability: Old vs. New
Concerned that you'll miss out on repeatability when you purchase an older robot model? A comparison study of four different Motoman generations demonstrates only slight changes in overall repeatability:

         Model                         Repeatability

1)      K6 ERC .......................0.1mm
2)      SK6 MRC ....................0.1mm
3)      UP6 XRC ....................0.08mm
4)      HP6 NX .......................0.08mm

Interested in more repeatability information? Contact RobotWorx or call 740-251-4327.