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8 Micron Accuracy for Under $20,000

With Precise Automation's integrated vision, controllers and robots, it’s a reality. By visually closing the robot's position loop using a process known as visual servoing, a robot can achieve placement accuracies based on its encoder resolution rather than its absolute accuracy. With visual servoing, low-cost, high-resolution robots with limited intrinsic absolute accuracy can be used in applications requiring high placement accuracies.

How does it work?

PreciseVision takes a picture and analyzes the relative position of a part and target (such as a needle and thread). By looking at both objects simultaneously, PreciseVision can determine their relative distance and direction and move the part accordingly. Instead of sending the robot a single motion command in world coordinates as in a traditional vision guidance application, vision sends a series of incremental distance and direction motion commands to a Guidance Controller embedded in a PrecisePlace Robot. As the PrecisePlace executes the motion, more pictures are taken. PreciseVision continuously analyzes the new images and updates the motion commands accordingly. This process continues until vision confirms that the task is accomplished. Since the system is constantly correcting for inaccuracies from multiple sources, the system can achieve placement accuracies at the level of its encoder resolution.

What makes it possible?

Visual servoing is now practical due to PreciseVision’s high performance and the tight integration of PreciseVision and PrecisePlace robots.  The resulting system can capture, analyze and put corrections into effect dozens of times per second.

The Visual Servoing Advantage:
  • Enables low cost, high accuracy automated systems.
  • Visually confirms that a move has been executed successfully.
  • Adjusts to inaccurate grippers that do not capture parts repeatably.
  • Simplifies calibration process.
  • Removes inaccuracies due to thermal expansion and age.
  • Automates processes where parts or targets change in real time.
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Visual Servoing – system captures multiple images and determines the relative distance between the part and the target.  A series of incremental motion commands are executed until vision confirms the task is accomplished.

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