Behind
the drawn factory doors of facilities across Europe, humans are working safely alongside
a new kind of colleague; one that is stronger, faster and more efficient than
ever before: collaborative robots. Here, Chris Johnson, managing director of bearing distributor SMB Bearings Ltd,
explains how to choose the right bearing for this new automation application.
Just a few years ago, collaborative robots
were widely considered a novelty, but the technology has quickly grown to be
one of the most significant
trends in robotics. In fact, an ABI Research study predicts that industry will
be populated with more than 40,000 collaborative robots by 2020.
As opposed to traditional industrial robots,
which are confined to operate in work cells to protect human workers,
collaborative robots can operate — as the name suggests — collaboratively with
their human counterparts. They are designed to operate safely alongside
people, by limiting the robots force and implementing sensors that prevent the
robot colliding with a human or any other equipment.
The machines are used to carry out
repetitive roles such as assembly and handling, taking these menial tasks away
from humans to free them up for more complex tasks. As they are designed to
take on these basic operations, collaborative robots tend to be much simpler
than other industrial robots, making them cheaper to buy, easier to operate and
less hassle to maintain.
Maintaining
accuracy
Despite the simplification of their design,
the specification of bearings for collaborative robots is just as important a
consideration as those of more complex robots, like six-axis or SCARA models. Industrial
robots are required to deliver high levels of accuracy and repeatability and
collaborative robots are no exception.
Consider the rotary joints of a
collaborative robot as an example. Manufacturers expect the robot to deliver
smooth actions, with good rotational accuracy and reliability. However, in
robotics applications, there is more to choosing a bearing than simply
selecting one that fits.
To guarantee the high levels of rotational
precision and reliability required for the operations of a collaborative robot,
manufacturers should invest in high quality, precision bearings for the robot’s
rotary joints.
As distributors of Sapporo Precision of
Japan, who manufacturer EZO thin section bearings for robotics applications, we
understand how high-quality bearings can prolong the lifespan of industrial
equipment. These bearings are lightweight take up much less space than standard
bearings and have excellent standards of roundness and surface finish.
Conversely, a poor-quality bearing can
result in unexpected downtime caused by inaccurate movement or higher
frictional torque creating problems with the robot’s operation. For
collaborative robots, any inaccuracies can also create significant health and
safety risks for human workers.
Making
the most of investments
Naturally, manufacturers investing in
collaborative robots are doing so to increase productivity, output and — perhaps
most importantly — increase profits in their facility. However, not all
manufacturers are aware that incorrect bearings can directly impact the
functionality and the longevity of a collaborative robot’s lifespan.
As with any kind of industrial robot, there
is no standard bearing that will suit every collaborative robot application.
The correct bearing would depend on the environment in which the robot will
work and its operations. Manufacturers should speak to a
bearing
expert for advice on selecting the right bearing specification.
In 2016, collaborative robots represented
just three per cent of all industrial robots sold. However, estimates suggest
that collaborative robots will account for 34 per cent of all industrial robots
sold by 2025. There has never been a better time to invest in collaborative
robots.
For advice on selecting robotics
bearings, speak to the bearing experts at SMB Bearings. The team can discuss
the exact bearing specifications needed for your application to ensure you make
the most of your robot investment.
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SMB Bearings recommending using Japanese Sapporo brand EZO bearings for robotic applications, including new collaborative robots.
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