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The working envelope of a robot is boundary of the space, or volume, in which the robot can perform its function. Different robot configurations generate characteristic working envelope shapes. This working envelope is important when selecting a robot for a particular application.

Several details should be borne in mind:

- The working envelope refers to the working volume which can be reached by some point at the end of the robot arm, this point is usually the centre of the end effector mounting plate. It excludes any tools or workpiece which the end effector may hold.

- There are often areas within the working envelope which cannot be reached by the end of the robot arm. Such areas are termed dead zones.

- The maximum quoted payload capacity can only be achieved at certain arm spans this may not necessarily be at maximum reach.

There are several standard shapes for the working envelope:

Cartesian Configuration: a rectangular prism. There are no dead zones within the working envelope and the robot can manipulate its maximum payload throughout the working volume.

Cylindrical Configuration: a cylinder. The cylinder is hollow, since there is a limit to how far the arm can retract, this creates a cylindrical dead zone around the robot structure.

Polar Configuration: the volume between two partial spheres. Physical limits are imposed by the design on the amount of angular movement in both the vertical and horizontal planes. These restrictions create conical dead zones both above and below the robot structure.

Revolute Configuration: almost a true sphere, or a complex cusp shape. The shape depends on the individual design. The working envelope is large relative to the floor space occupied.

SCARA Configuration: a heart- or kidney-shaped prism, having a circular hole passing through the middle. This allow a large coverage in the horizontal plane but relatively little in the vertical plane.

Spine Configuration: approximately a true hemisphere, the size being dependent on the number of articulations in the spine.

Pendulum Configuration: a simple horseshoe having a segmented shaped cross section. The limited working envelope is offset by the fact that this robot can be mounted in almost any position, allowing the envelope to be finely positioned in relation to its task.

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