Positioning accuracy and repeat positioning accuracy are two different concepts
Commonly used in industry to describe the performance of mechanical systems.
The accuracy of repeated positioning is higher than the positioning accuracy
Positioning accuracy
The positioning accuracy is a certain value, not a range, while the repeated positioning accuracy is a range.
Positioning accuracy refers to the degree of deviation between the target position and the actual position that the mechanical system can achieve in a single movement.
It reflects the precision of the mechanical system in reaching the target position in a single movement.
Simply put: this is the error between the actual position reached when the machine equipment stops and the position you requested.
Positioning accuracy is a set value (for example, 0.01 mm), not a range (for example, ±0.02 mm).
The positioning accuracy error depends on the manufacturing error of the transmission components.
Example: An axle should travel 100 mm, but it actually travels 100.01 mm. The extra 0.01 is positioning accuracy.
For example: set the screw movement distance to 100 mm. Therefore, the actual movement distance of 100 screws is 99.99mm-100.01mm, and the positioning accuracy is 0.02mm (100.01-99.99=0.02).
Repeat positioning accuracy
Repeated positioning accuracy refers to the precision with which the mechanical system can repeatedly achieve the same target position in multiple movements. It reflects the consistency and repeatability of the mechanical system to achieve the same target position in multiple movements. movements. The application of repetitive movements is very important.
In simple terms: this is the error caused by repeatedly positioning the same position in the past.
Repeat positioning accuracy is a range (e.g. ±0.02)
The repeated position error is related to the clearance of the transmission components.
In addition, the accuracy of repeated positioning is not only related to the accuracy and resolution of the array scale (displacement sensor), but also to the errors of mechanical systems, such as guidance systems, systems transmission and structural rigidity.
These factors will reduce the positioning accuracy and affect the accuracy of repeated positioning to a certain extent.
Example: An axis must travel 100 mm.
As a result, the first time it traveled 100.01 mm, and after repeating the same action it traveled 99.99 mm. The error between this is 100.01-99.99 = 0.02mm, which is the repeated positioning accuracy.
Repeated positioning expression method: expressed as ±x, the above error is expressed as ±0.01mm, which is ±(0.02/2).
For example: set the screw rod moving distance to 100mm and the actual moving distance is 99.988mm to 99.992mm after 100 movements.
Its reproducible positioning accuracy is ±0.002 mm.
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