Preparing the published article.
Gripper Selection: Match the Tool, Part and Process
Choose robot gripping equipment by part variation, contact surfaces, dynamic loads and process handoffs. Define integration and acceptance evidence before comparing tool prices.
Describe the part before choosing the gripper
A gripper must acquire, retain and release the actual workpiece throughout the task. Start with a representative part family, including size variation, mass, centre of gravity, material, temperature, surface condition and fragility. Record whether the part arrives in a fixture, randomly in a bin or moving on a conveyor. The most difficult allowed part often determines the tool design.
Define what counts as success: acceptable marks, permitted deformation, orientation, placement accuracy and how a failed pick is detected. A reliable grip that damages the product or prevents the next operation is not an acceptable process.
Compare gripping principles against the workpiece
Mechanical fingers can engage geometry or rely on friction. Vacuum systems depend on the interaction between the tool, available contact area and workpiece surface. Magnetic or other specialized tools may suit different materials and tasks. The Schmalz selection guide illustrates why delicate, porous and perforated materials lead to different tool choices.
Request trials using representative surfaces, including expected dust, oil, moisture or packaging variation. Do not extrapolate from a clean demonstration sample to every production batch. Ask the tool supplier to document the conditions behind its selection and the limits that would require another design.
Calculate the complete moving load
Include the tool, fingers, adapter, changer, cables and workpiece when evaluating the robot wrist. The part's mass alone is not the complete load. Ask the robot and tooling suppliers to review centre of gravity, inertia, movement and process forces for the intended trajectory.
Robotiq's FAQ distinguishes gripper payloads and grasp modes and asks for robot model, mounting pattern and communication details when checking compatibility. Use the specification for the exact tool and configuration. A family name or nominal payload should not substitute for a supported application calculation.
Plan sensing, utilities and tool changes
Specify how the system confirms acquisition, retention, release and an empty pickup location. Decide what information is needed from finger position, vacuum monitoring, part detection or another sensor. Define the response to uncertainty; an assumed grip should not silently become a completed-pick signal.
The ATI QC-7 page shows a changer with separate master and tool sides, utility options and model-specific load information. A changer adds its own integration work. Include tool storage, locking confirmation, service connections and the recovery procedure for an interrupted exchange in the cell design.
Confirm voltage, air or vacuum supply and control interfaces.
List included adapters, cables, valves, fingers and software options.
Check access for cleaning, adjustment and replacement of wear parts.
Assign responsibility for tool and robot configuration after changeover.
Test the process and foreseeable failures
Build an acceptance plan around the full part range and real handling sequence. Check pickup from the worst permitted position, loaded travel, transfer into the destination and clean release. Record missed picks, double picks, product damage and operator intervention rather than reporting only successful demonstration cycles.
Have qualified personnel assess part-drop, trapping and other hazards and define controlled verification procedures. A soft finger or a gripper intended for a collaborative arm does not make the complete application safe. Include the workpiece and surrounding fixtures in the assessment.
Compare complete offers and ongoing support
Request a bill of materials, supported robot and software versions, trial conditions, drawings and acceptance responsibilities. Compare spare fingertips or suction cups, preventive maintenance, cleaning consumables, replacement lead times and the effort to add another part. Separate product supply from custom engineering and commissioning.
Use Write a Robotics Buyer Brief with drawings and representative samples, and consult Robotics Knowledge for related decisions. The linked manufacturer sources were checked on 10 September 2026; their examples support selection questions rather than a guarantee for your workpiece.