Estimate whether a robot can physically reach a target point using horizontal distance, vertical distance, available robot reach, and a safety margin.
Use this for early layout studies, fixture planning, part presentation review, robot family selection, and basic accessibility checks before moving into full simulation.
This calculator estimates whether a robot can physically reach a target point using a simple straight-line distance calculation. It compares the required reach to the usable reach remaining after a safety margin is removed from the robot’s catalog reach.
It is useful for robot accessibility checks during automation layout, EOAT planning, fixture design, part presentation, weld cell planning, material handling layouts, and preliminary reach studies.
The goal is not to replace robot simulation. The goal is to quickly answer the first question: is this target point even reasonably close enough for the robot to reach?
The calculated distance from the robot mounting reference to the target point using the entered horizontal and vertical distances.
The robot’s entered reach after subtracting your safety margin. This gives a more conservative number than using catalog reach directly.
The difference between available reach and required reach. Positive margin means the point is within the basic estimate. Negative margin means the target is outside the estimate.
The result tells you whether the target is comfortably within range, tight but possible, or outside estimated reach.
This tool is most useful early in the layout process, when you are still comparing robot sizes, cell geometry, fixture locations, and part presentation options.
Check whether a robot base location is reasonable before spending time detailing the full cell.
Estimate whether part nests, weld fixtures, presses, conveyors, racks, or dunnage locations are in a practical range.
Compare different part presentation points before committing to a feeder, table, conveyor, or tooling concept.
Use the reach margin as an early warning before adding tool length, wrist offsets, cable routing, and real approach constraints.
Decide whether a robot family is even in the right size range before comparing payload, wrist torque, and cycle time.
Avoid spending time in robot simulation on layouts that are already clearly too far away.
A reach check should usually be the first robot layout filter, not the final decision. A point can be inside catalog reach and still fail once tooling, approach angle, joint position, or guarding interference are considered.
Enter the robot’s published reach, the horizontal distance from the robot reference point to the target, the vertical distance to the target, and the safety margin you want to reserve.
The calculator estimates the required straight-line reach and compares it to the available reach after your margin is subtracted.
This is a straight-line reach estimate from the robot mounting point to the target point. It does not account for joint limits, wrist orientation, interference, tooling length, singularities, dress pack constraints, or real safe working envelope restrictions.
If the remaining margin is 6 inches or more, the target is within estimated reach with a basic cushion. You should still check EOAT, wrist angle, and approach direction.
If the remaining margin is positive but less than 6 inches, the target may be reachable, but you should treat it as a warning. Small changes in tooling, mounting, or approach angle can make it fail.
If the remaining margin is negative, the target is outside estimated reach using your selected safety margin. Move the robot, move the target, reduce the vertical/horizontal offset, or consider a larger robot.
Do not treat catalog reach as guaranteed usable reach everywhere in the cell. Real working envelope can shrink fast once tooling, part geometry, cable routing, and approach direction are considered.
A robot may reach a point in space but not with the tool angle needed for welding, dispensing, gripping, loading, or inspection.
EOAT length can help reach some points but may create wrist loading, clearance, deflection, or recovery problems.
Check the entire robot body, arm, wrist, tool, part, dress pack, and cable routing — not just the TCP point.
Applications like spot welding, projection welding, adhesive dispensing, machine tending, and vision inspection often require a specific approach direction.
Floor mount, pedestal mount, wall mount, and inverted mount layouts can completely change practical access to the same target point.
Moving the robot base a few inches can sometimes solve reach, clearance, and wrist posture issues better than upsizing the robot.
This calculator is intentionally simple. It is meant to help you screen layouts quickly. Final robot selection and cell approval should include deeper review.
Use simulation to verify joint motion, singularities, reach envelope, clearance, approach angles, and cycle time.
Always check the robot manufacturer’s actual work envelope diagrams and wrist load ratings.
Reach checks do not replace guarding, safety distance, robot speed, teach mode, risk assessment, or safe stop review.
Welding, dispensing, fastening, machine loading, and inspection tasks each have process-specific constraints beyond reach.
This page usually works best alongside payload, cycle time, pneumatic tooling, servo sizing, and ROI checks so you can confirm the robot can both reach the point and perform the task safely and reliably.
Get connected with a qualified automation integrator if you need help with robot layout, fixture placement, EOAT planning, robot simulation, guarding review, or full work envelope validation.
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