written 22 months ago by |
Solution:
Repeatability:
The measure of the ability of the robot to position the tooltip the same place repeatedly.
Repeatability is the ability of a robot to repeatedly position itself when asked to perform a task multiple times. Accuracy is an absolute concept, repeatability is relative.
Note that a robot that is repeatable may not be very accurate.
Likewise, an accurate robot may not be repeatable.
Precision:
Precision is the 'fineness' with which a sensor can report a value.
The measure of the spatial resolution with which the tool can position within the work envelope.
For example, a sensor that reads $2.1178$ is more precise than a sensor that reads $2.1$ for the same physical variable.
Precision is related to significant figures.
The number of significant figures is limited to the least precise number in a system of sensing or a string of calculations.
Reach:
The horizontal reach maximum radial distance is positioned from the vertical axis about which the robot rotates.
There are two types of reaches:
1) Horizontal reach
2) Vertical reach
Horizontal reach :
It is defined as the distance the arm can travel in the horizontal direction
Vertical reach :
It is defined as the distance the arm can travel in the vertical direction
Stroke:
This brain-controlled robotic arm requires no surgery and is accessible to robotically guide stroke rehabilitation both in the clinic and at home.
Horizontal stroke:
That is the difference between the maximum and minimum horizontal reach.
Vertical stroke:
That is the difference between the maximum and minimum vertical reach.
Accuracy:
Accuracy is the ability of a robot to go to the specified position without making a mistake. It is impossible to position a machine exactly.
Accuracy is therefore defined as the ability of the robot to position itself to the desired location with minimal error (usually $0.001$ inch).