SMB Bearings helps Shadow Robot Company build industrial grasping robot

  • April 02, 2018
  • Case Study
SMB Bearings helps Shadow Robot Company build industrial grasping robot
SMB Bearings helps Shadow Robot Company build industrial grasping robot

April 2, 2018 - The Amazon Picking Challenge, set by global online retailer Amazon, challenged roboticists to create a robot that can pick and stow twelve products from a shelf, into a bag. The Shadow Robot Company, designer and manufacturer of anthropomorphic robot hands, addressed the challenge with the help of SMB Bearings.

Sounds simple right? Well Amazon set this challenge because this is the only area of their warehousing process that isn't currently mechanised, due to the sheer variety of objects to be packed. This presents a gap in robotics for a smart grasper that is able to recognise and pick different objects effectively.

Grasping is a problem for many industries, not just picking up an object — but grasping it well and ensuring that each grasp is correct for the object that's being picked.

"More and more I’ve had people come up to me asking how we can improve robotic grasping," said Rich Walker, managing director at The Shadow Robot Company. "The market is pushing us to improve the technology."

Standard industrial grippers are built to pick up one thing, move it and put it down. If you have two different sets of objects, you'll need two different grippers to perform the task. Modern manufacturers are increasingly diverse, producing reams of different products, often with custom finishes. Single use tooling is no longer sufficient to keep up with demand. There is a need for tooling that is easily adaptable to pick up many different types of objects.

The robot engineers at the Shadow Robot Company have had plenty of experience manufacturing dextrous robotic hands for academia and nimble work, but this type of robot isn't suitable for industrial applications. Instead, they looked to create a Smart Grasping System, with the intelligence to recognise many different objects and select the appropriate grasp. 

As part of the design process, the Shadow Robot Company needed specific bearings with very tight tolerances in dimensional accuracy. This is important for  accuracy of the smart grasper’s movements. So, the team contacted SMB Bearings as the business is known for its supply of non-standard bearings.

Based on the requirements of this unique project, SMB Bearings recommended and supplied EZO thin-type precision bearings.

With the support of SMB Bearings and using a small sample of the EZO thin-type precision bearings, the research and development team at the Shadow Robot Company trialled different grease levels to find the optimal grease fill. As robotic movements need predictable and accurate some friction is essential to ensure this control. A process of testing and trial and error demonstrated the correct friction coefficient and its corresponding percentage grease fill for optimum performance.

SMB bearings then supplied the full amount of bearings required to this exact specification.

"These bearings were very easy to install in our Smart Grasping System," said Luke Moss, robot engineer at the Shadow Robot Company. "This is a direct result of the quality, tolerance and consistency of these bearings, something that is essential for repeated assembly and high precision across multiple robots. Additionally, as the essential core to the lifespan of any robot, we expect these bearings to outlive most other parts of the Smart Grasping System."

Created to stand-out from standard graspers on the market, the Smart Grasping System is still in development, but ultimately will have built-in “smart” intelligence, allowing it to  to pick up many types of objects, reducing the need for numerous hands in a factory. Additionally, torque sensing on each joint will ensure the Hand can make the most accurate and reliable grasp of whatever object it picks up.                                                   

The Smart Grasping System is designed to reduce the need for manufacturers to keep investing new grippers for different tasks. Changing machinery incurs huge costs, and takes up a lot of time.

Remember the Amazon Picking Challenge mentioned? The Shadow Robot Company set its own picking challenge, using objects from Amazon's challenge as well as others, to put the Smart Grasping System to the test. The Smart Grasper recognised and grasped these objects with ease.

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