How to Choose the Right Robot Reach
Robot reach is one of the most important specifications to consider when selecting an industrial robot. A robot with insufficient reach may not be able to access all required positions, while an unnecessarily long reach can increase equipment cost and reduce flexibility.
Choosing the right robot reach requires a clear understanding of the robot's working area, workpiece location, installation position, payload, and application requirements.
1. Understand What Robot Reach Means
Robot reach generally refers to the maximum distance a robot can reach from its defined axis or mounting reference point.
However, maximum reach does not mean that the robot can effectively perform every operation at that distance. The actual usable workspace depends on the robot's joint configuration, movement range, tooling, workpiece position, and required orientation.
Therefore, robot reach should be considered together with the complete application rather than as an isolated specification.
2. Measure the Required Working Area
Before selecting a robot, identify all the positions the robot needs to access.
Measure the distance between the robot mounting position and the farthest required working point. Also consider the height of the work area and the movement required between different positions.
For applications such as machine tending, welding, assembly, and material handling, the robot may need to reach multiple points rather than a single location.
A simple working-area measurement can help narrow down the appropriate robot reach range.
3. Consider Robot Installation Position
Robot installation has a direct effect on the required reach.
A floor-mounted robot may require a different reach from a ceiling-mounted or wall-mounted robot. In some production lines, changing the robot installation position can reduce the required arm reach and improve workspace utilization.
When planning the layout, consider the robot base, surrounding machines, safety fencing, conveyors, fixtures, and operator access.
4. Consider Workpiece Size and Position
The workpiece itself can affect the required robot reach.
Large components may require the robot to reach around fixtures or into machines. In addition, the robot may need to approach the workpiece from different angles.
For machine tending applications, for example, the robot must be able to reach the machine door, work area, loading position, and unloading position while maintaining an appropriate tool orientation.
5. Do Not Ignore Robot Payload
Reach and payload should be evaluated together.
A robot may have a specified maximum payload, but the effective payload capability can be affected by the distance from the robot's wrist to the center of gravity of the tool and workpiece.
A longer reach combined with a heavy gripper and workpiece can create greater mechanical loads on the robot.
Therefore, selecting a robot based only on maximum reach can result in an unsuitable configuration.
6. Consider Tool and Gripper Dimensions
The robot's end-of-arm tooling also takes up space.
When calculating the required reach, include the dimensions of the robot gripper, welding torch, vacuum tooling, robotic hand, or other end-of-arm tooling.
The tool may need additional clearance to enter a machine, pick up a component, or avoid surrounding equipment.
This is particularly important for applications involving deep machine interiors or narrow working spaces.
7. Allow Enough Clearance
The robot should not operate exactly at the limit of its reach.
Adequate clearance should be considered for robot movement, tooling, workpieces, fixtures, and surrounding equipment.
A robot operating continuously near its maximum reach may also have less flexibility for certain movements and orientations.
For this reason, it is generally better to select a robot with sufficient working range rather than choosing a model that only reaches the farthest point under ideal conditions.
8. Consider the Application
Different applications have different reach requirements.
Pick-and-place:
The robot needs enough reach to move between pickup and placement positions efficiently.
Machine tending:
The robot must access machine loading areas, workholding fixtures, and unloading positions.
Welding:
Reach must cover the complete welding area while allowing the required torch orientation.
Assembly:
The robot may need to reach multiple assembly stations with high positioning accuracy.
Palletizing:
Reach should cover the pallet area and different stacking positions while maintaining the required payload.
9. Check the Robot's Full Specifications
Robot reach should never be evaluated alone. Before purchasing, compare it with other key specifications such as:
The goal is to find a balanced configuration that meets the application requirements without unnecessarily increasing the robot size.
How to Choose the Right Robot Reach
The right robot reach depends on the complete application rather than simply the distance to the farthest point.
Before selecting a robot, determine the required working area, robot installation position, workpiece dimensions and locations, tooling size, payload, clearance, and required movement path.
For automation projects, a supplier or system integrator can also evaluate the robot's reach based on the production layout and operating requirements.
If you are planning a robot automation project and need help selecting a suitable robot, provide information such as the workpiece size and weight, working area, robot installation position, required cycle time, and application type. Our team can help evaluate suitable robot configurations and provide product and project support.
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