Custom gripper design is one of the most critical factors when choosing an industrial manipulator. A manipulator is not selected only to lift a load. The real success starts with gripping the product from the correct point, with the correct force, in a safe and controlled way.
A manipulator may technically be able to carry 100 kg, but this does not mean that every 100 kg product can be handled smoothly with the same manipulator. Product geometry, surface structure, center of gravity, sensitivity, gripping points, rotation requirement and production line layout directly affect the gripper design.
For this reason, manipulator selection should not be based only on load capacity. For the correct manipulator solution, gripper design must be evaluated according to the real movement of the product on site. Where will the product be picked from, where will it be placed, at which angle will it be handled, will it be rotated, will it be loaded into a machine, must the surface remain free of marks, and from which side will the operator approach the product? These questions must be answered correctly.
In PM Manipulator solutions, gripper design is not considered as a secondary attachment to the manipulator system. It is treated as a central engineering subject of the complete solution. Because the quality felt by the operator on site is often determined by how the gripper holds the product before the manipulator arm itself.
What Is a Gripper?
A gripper is the gripping equipment that creates the contact point between the manipulator and the product being handled. In other words, it is the special attachment that allows the manipulator to hold, lift, move, rotate or place the product at a specific point.
Grippers can have different structures depending on the product type. Some products are held by vacuum, some are gripped magnetically, some are clamped with mechanical jaws, some are gripped from the inner diameter, some are supported from the outside, and some require bottom support or a custom fixture logic.
For this reason, a gripper should not be considered as a standard component. Correct gripper selection or custom gripper design is a basic requirement for safe and efficient manipulator operation.
Why Is Manipulator Capacity Alone Not Enough?
One of the most common mistakes when choosing a manipulator is focusing only on load capacity. However, two products with the same weight may require completely different gripper solutions.
For example, an 80 kg flat sheet metal part and an 80 kg unbalanced casting part are not handled in the same way. A 50 kg glass panel and a 50 kg metal reel also cannot be safely handled with the same gripping method. Even if the product weight is the same, the surface structure, sensitivity, center of gravity and gripping points may be different.
The manipulator may be able to lift the load, but if the gripper cannot hold the product correctly, the system will not perform successfully on site. The product may slip, become unstable during rotation, suffer surface damage, become difficult to place into the machine, or force the operator to use extra physical effort to control the load.
Therefore, the correct question is not only “How many kilograms will it carry?” The correct question is: “How will this product be gripped safely, in balance, without damage and in an ergonomic way?”
When Is a Custom Gripper Required?
In some applications, standard vacuum, standard magnetic or standard mechanical gripping solutions may be sufficient. However, in many production lines, the product structure is specific, so the gripper design must also be customized for the product.
If the product has a sensitive surface and scratches, marks or deformation must be avoided, special contact surfaces should be used. If the product has an unbalanced center of gravity, the gripper should not only hold the product; it should also maintain balance during handling.
If the product is hot, oily, sharp-edged or difficult to grip, a standard gripping solution may not be safe. If the product will be rotated, the gripper must support the product safely not only during lifting, but also during rotation.
If the product will be placed precisely into a machine, fixture or mold, gripper positioning accuracy becomes important. If the product is a bobbin, reel, roll, panel, glass, sheet metal, drum, casting part or a special-shaped machine component, a product-specific gripping logic may be required.
In such cases, custom gripper design directly determines the success of the manipulator system.
When Is a Vacuum Gripper Used?
Vacuum grippers are preferred for products with surfaces suitable for vacuum gripping. They are effective for products with flat, airtight or vacuum-pad-contact surfaces.
Glass, panels, sheet metal, plastic plates, wooden panels, packaged products, white goods parts or large-surface materials can be examples of vacuum gripper applications. However, when selecting a vacuum gripper, the product surface must be analyzed correctly.
If the surface is rough, perforated, porous, oily or likely to cause vacuum leakage, a standard vacuum gripping solution may not be sufficient. In this case, pad type, number of pads, vacuum line, safety valves, vacuum level control and contact points on the product surface must be evaluated specifically.
Safety is also critical in vacuum grippers. The load should not be lifted before sufficient vacuum level is achieved, the presence of the product should be checked, and the system should behave safely in case of vacuum loss.
When Is a Magnetic Gripper Used?
Magnetic grippers are used for handling ferromagnetic metal products. Sheet metal parts, laser-cut metal plates, press parts, steel plates or metal-surface products may be suitable for magnetic handling.
When selecting a magnetic gripper, the product material, surface condition, thickness, contact area, weight and handling direction must be evaluated. Not every metal product is equally suitable for magnetic handling. Thin sheet metal, oily surfaces, hollow parts or low contact area can affect magnetic holding performance.
The advantage of a magnetic gripper is that it can grip the product without mechanical clamping on the surface. However, magnet type, safety factor, release control and operator use scenario must be planned correctly for safe handling.
When Is a Mechanical Gripper Used?
Mechanical grippers are solutions where the product is held physically by jaws, hooks, pins, internal expansion, external clamping or bottom support. These grippers are especially preferred when vacuum or magnetic gripping is not suitable.
Bobbins, reels, rolls, drums, casting parts, special-shaped machine parts, hollow bodies or products with surfaces unsuitable for vacuum can be handled with mechanical grippers.
In mechanical gripper design, gripping force, contact surface, product deformation, safety lock, opening-closing logic and operator control must be evaluated carefully. Excessive clamping force may damage the product. Insufficient clamping force may create slipping or falling risk during handling.
For this reason, mechanical gripper design should be made according to the real product dimensions and working conditions.
What Is the Difference Between Internal Gripping and External Gripping?
Some products are gripped from the inner diameter, while some are held from the outer surface. This decision is made according to product geometry and process requirements.
Internal gripping can be preferred especially for bobbins, reels, rolls or hollow products. The gripper enters the central hole of the product and expands from the inside to grip it safely. This solution provides an advantage when the outer surface is sensitive or when gripping from the outer diameter is not suitable.
External gripping is a solution where the product is clamped or supported from the outer surface. This method can be used when the product has no inner opening or when safe gripping from the outer surface is possible.
In both methods, the key point is that the product remains balanced during handling and no unwanted surface damage occurs.
How Does Gripper Design Affect Product Safety?
Correct gripper design directly determines product safety. If the product is gripped from the wrong point, it may slip, fall, rotate unexpectedly or suffer surface damage during handling.
Especially for products with sensitive surfaces, gripper contact points must be selected correctly. For glass, painted sheet metal, stainless surfaces, plastic surfaces, coated parts or products with important aesthetic surfaces, contact material and contact force become critical.
For heavy products, not only the contact point but also handling balance is important. If the center of gravity is not suitable for the manipulator axis when the product is lifted, the operator may have difficulty controlling the load. This can create problems for both ergonomics and safety.
Gripper design helps the product to be handled without damage, held in the correct position and transferred safely into the production line.
How Does Gripper Design Affect Operator Ergonomics?
For a manipulator to be ergonomic, the gripper must also work ergonomically. If the operator uses extra force to hold the product, manually intervenes to align the load or struggles because the gripper carries the product in an unbalanced way, the system cannot be considered fully ergonomic.
A correctly designed gripper allows the operator to guide the load with a natural movement. The control handle should be easy to reach, the gripper opening and closing movement should be clear, the operator should be able to see the load, and excessive force should not be required while placing the product.
Gripper ergonomics is especially important in repetitive operations. In applications where the same movement is repeated hundreds of times during a shift, even a small difficulty in use can increase operator fatigue. Correct gripper design helps reduce strain on the operator’s lower back, shoulders, arms and wrists.
How Is Safety Ensured in Gripper Design?
Gripper safety is one of the most important subjects in a manipulator system. The product must not be released accidentally, lifting should not be possible before sufficient gripping is achieved, and the load must be held safely during handling.
Depending on the application, part detection sensors, vacuum control, pressure control, mechanical locking, two-hand control, safety valves, pneumatic brakes, load release control or emergency stop functions can be evaluated.
In vacuum grippers, lifting should not be allowed before sufficient vacuum level is achieved. In magnetic grippers, the product’s suitability for magnetic holding must be checked. In mechanical grippers, the product must be safely gripped after the jaws are closed.
Safe gripper design is necessary not only to prevent the product from falling, but also to allow the operator to work with confidence in the system.
How Does Gripper Design Affect Manipulator Efficiency?
Correct gripper design can shorten handling time and make the process more standardized. If the operator does not spend extra time trying to grip the product, if the product is held correctly on the first attempt and if the release position can be repeated consistently, the production line works more efficiently.
Incorrect gripper design can increase cycle time. The operator may have to adjust the product manually, the product may slip during gripping, alignment problems may occur at the release point, or the system may stop frequently due to safety issues.
For this reason, gripper design is important not only for safety and ergonomics, but also for production efficiency.
How Does PM Manipulator Approach Gripper Design?
At PM Manipulator, gripper design is evaluated according to the real handling requirement on site. Not only the product weight, but also its form, surface, center of gravity, gripping points, rotation requirement, working area and operator use scenario are examined together.
In the PM approach, the first goal is to grip the product safely and without damage. The second goal is to allow the operator to guide the load easily and naturally. The third goal is to ensure that the system works repeatedly and efficiently in the production line.
In some applications, standard vacuum, magnetic or mechanical gripper solutions may be sufficient. In other applications, a custom fixture, special jaw structure, internal gripping, external gripping, 90-degree rotation, 180-degree turning, sensor-based control or product-specific engineering solution may be required.
For PM Manipulator, the gripper is not a simple attachment added later to the manipulator. It is the main engineering component that determines the successful operation of the complete system on site.
In Which Applications Does Custom Gripper Design Stand Out?
Custom gripper design may become necessary in many industries. Automotive, white goods, defense industry, glass, panel, metal processing, casting, packaging, chemical, plastics, paper, textile and machine manufacturing industries all have different product geometries and different handling requirements.
For bobbin, reel and roll handling applications, the Reelful solution can be configured according to requirements such as internal gripping, external support, 90-degree rotation and machine loading.
For panel handling applications, the Panelful solution can be evaluated for balanced handling of large-surface products without surface damage.
For glass handling applications, the Glassful solution can be used for vacuum gripping, safe handling and precise positioning.
For vacuum handling applications, the Vacful solution can provide fast and controlled handling for products with suitable surfaces.
For drum handling and emptying applications, the Drumful solution can be used for gripping, rotating and emptying drums.
For magnetic handling applications, the Magnetful solution can help handle metal products safely and in a controlled way.
In each of these product families, gripper design is shaped according to the real requirement of the application.
Which Questions Should Be Asked About the Gripper When Choosing a Manipulator?
For correct gripper design, the product weight, dimensions, geometry and center of gravity should be clarified at the beginning of the project. The product’s surface sensitivity, suitability for vacuum gripping, suitability for magnetic gripping and whether mechanical clamping may damage the product should be evaluated.
It should be defined whether the product must be gripped internally, externally or from the bottom. If the product will be rotated, placed precisely into a machine or fixture, or if it is hot, oily, sharp-edged or fragile, these details must be considered in gripper design.
In addition, the operator approach direction, possible collision risks in the working area, the need for safety sensors or part detection, and gripper maintenance access should also be clarified at the beginning of the project.
When these questions are answered correctly, gripper design becomes safer, more ergonomic and more efficient.
Conclusion
Custom gripper design is one of the most important parts of manipulator selection. Even if the manipulator load capacity is correct, the system cannot deliver the expected performance on site if the product is not gripped correctly.
A correct gripper holds the product safely, balances the center of gravity, helps prevent surface damage, improves operator ergonomics and creates a more repeatable handling process in the production line.
When choosing a manipulator, not only kilogram capacity but also product form, surface, gripping point, rotation requirement, working area, safety requirement and operator use scenario should be evaluated together.
PM Manipulator can develop site-oriented engineering solutions for different product handling requirements with standard and custom gripper solutions. The first step for the correct manipulator solution is to define the product to be handled and how that product should be gripped.