Robot accuracy and repeatability: Key differences explained

What is robot accuracy?

Robot accuracy is the ability of a robot to reach a specific target within its workspace. It ensures the robot can follow programmed instructions to perform tasks requiring precise placement. High accuracy is crucial in delicate operations where even small deviations can affect the outcome.

For instance, in smartphone assembly, accuracy ensures a robot places tiny screws in the exact locations, preventing errors.

These factors affect accuracy: 

• How good are the sensors? The better the sensors, the better the robot knows where it is and where it’s going.
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• How sharp is the control system? The robot’s control system keeps it on track, making sure it follows instructions closely.
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• What’s the environment like? Things like temperature changes or vibrations can mess with accuracy, especially in delicate operations.

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What is robot repeatability?

Robot repeatability is all about consistency. If a robot is performing the same movement over and over, repeatability measures how reliably it returns to the same spot.

For example, imagine a robot on an assembly line that’s placing products into boxes. Repeatability means it places the items in the same place every single time — no matter how many times it does the same thing. 

Factors that affect repeatability:

• How stable are the joints? Stiff joints and high-quality actuators help the robot repeat movements without drifting.
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• Is it calibrated? Regular calibration keeps the robot on target, making sure it performs consistently.
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• Is it well-maintained? Over time, wear and tear on joints or actuators can affect how reliably the robot repeats its actions.

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How accuracy and repeatability impact robot performance

Different jobs require different combinations of accuracy and repeatability, depending on what you’re trying to accomplish. 

Here’s how they play a role:

• High accuracy, low repeatability: This works best for jobs that need precise positioning, like CNC machining or drilling. You want the robot to hit the exact spot every time, even if it’s not always perfectly consistent.
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• High repeatability, lower accuracy: For repetitive jobs like packaging, the robot must repeat the same motion consistently, even if it’s not perfectly precise.
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• A balance of both: Some applications, like robotic surgery or high-precision assembly, demand both things. In these cases, the robot needs to be spot-on and consistent.

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How to improve robot accuracy and repeatability

Getting better accuracy and repeatability out of your robots doesn’t just happen. 

You’ve got to make some tweaks to keep them performing at their best:

• Keep it calibrated: Regular calibration helps your robot stay accurate and consistent so it doesn’t drift over time.
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• Upgrade the sensors: Better sensors mean better precision. When the robot knows exactly where it is, it’ll hit the target more often.
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• Stay on top of maintenance: Keeping the joints and actuators in good shape means your robot will keep doing the same thing reliably.
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• Use smarter systems: AI and feedback loops can adjust the robot’s moves on the fly, making it more precise and repeatable.

Accuracy and repeatability in different robot types

Different types of robots focus on either accuracy, repeatability, or both, depending on their purpose. 

Here’s how they stack up:

• Industrial robots: These are meant for repeatability. Jobs like welding, painting, or material handling need the robot to do the same thing again and again without deviation.
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• Collaborative robots (cobots): Cobots need a mix of accuracy and repeatability since they often work side-by-side with humans in jobs like small assembly or inspections.
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• Mobile robots: For mobile robots, accuracy is critical when it comes to navigation, but repeatability also matters for jobs like docking or path-following.

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How to choose robots based on accuracy and repeatability

Picking the right robot means figuring out when accuracy, repeatability, or both are most important for the job.

Here’s how:

• Go for accuracy: If you’re handling precise work like machining or surgical tasks, accuracy is non-negotiable. The robot needs to land on the exact spot on a dime. 
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• Lean on repeatability: For repetitive work like packaging or palletizing, you’re better off with high repeatability. The robot needs to do the same thing, the same way, over and over, without much variation.
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• When you need both: Some jobs, like semiconductor manufacturing or lab testing, need both accuracy and repeatability. You want the robot to be on target and consistent.

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Summing up

If you're looking for both robot accuracy and repeatability, it's worth exploring how different models stack up based on your needs. 

Now, For high-precision work or repetitive actions, getting the right balance is key to getting the job done right.

Understanding your specific application will help you determine the best balance of accuracy and repeatability.

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Next steps with Standard Bots

If you are looking for a robot that balances both accuracy and repeatability at a reasonable cost, RO1 from Standard Bots is your ideal solution. Whether you need a machine that can perform repetitive tasks consistently or hit precise targets, RO1 delivers — all starting at just $5/hour through the lease option.

• Cost-effective: RO1 comes in at half the price of other robots in its class, giving you high-level performance without the high-level price.
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• Fast and powerful: With an impressive 18kg payload capacity, RO1 handles more work quicker, all while maintaining accuracy.
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• Smart precision: Powered by AI on par with GPT-4, RO1 combines both accuracy and repeatability, making it an excellent choice for both repetitive actions and tasks requiring fine precision.
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• Easy to integrate: RO1’s no-code setup means you’ll have it running in no time, with minimal fuss.
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• Built-in safety features: With built-in sensors, machine vision, and collision detection, RO1 keeps your operations safe and efficient.

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Reach out today for a risk-free 30-day trial of RO1. We’ll assist with the setup so you can see firsthand how it delivers reliable, accurate results.