Checklist for Calculating Actual Load Before Selecting Industrial Lifting Equipment

When selecting industrial lifting equipment, load capacity is always one of the first parameters considered. However, merely knowing how many kilograms the object weighs is not enough to determine the appropriate equipment configuration.

In reality, the load the equipment must handle also includes the fixture, gripping tool (end-effector), lifting accessories, along with factors such as the center of gravity, working radius, operating speed, and frequency. Overlooking any of these factors can lead to choosing under-capacity equipment, failing to meet requirements, or over-investing beyond actual needs.

Therefore, before selecting lifting equipment, let's review each factor in the actual load calculation checklist with Vietmani to make a more accurate, safe, and suitable decision for your production process.

What is the actual load capacity of lifting equipment?

Actual load capacity is the total mass that the lifting equipment must directly handle during operation, not just the weight of the object being lifted.

For example, you need to lift a 100 kg component using an industrial manipulator. If the gripping tool weighs 10 kg and the accompanying accessories weigh 5 kg, the equipment must actually handle at least 115 kg. If only 100 kg is used as the selection basis, the equipment configuration may not meet the correct operational requirements.

In addition to mass, Vietmani recommends evaluating further factors affecting load conditions, such as:

• Mass of the object being lifted: minimum value, maximum value, and variance between products.
• Mass of the End-Effector: gripper, fixture, lifting hook, or vacuum pad.
• Center of gravity position: whether the load is balanced or off-center.
• Working radius: the distance from the equipment's axis to the load's position.
• Handling movements: lifting, lowering, moving, rotating, tilting, or changing orientation.
• Operating frequency: number of lifting cycles and operating time per shift.

In other words, actual load capacity is not a single number taken solely from the lifting object's weight, but the result of evaluating the entire load conditions in a specific application.

Correctly identifying the load capacity from the beginning gives you and Vietmani a basis to select the appropriate lifting capacity, equipment structure, and End-Effector, rather than choosing equipment based solely on a nominal load parameter.

Checklist 1: Accurately Determine the Mass of the Object to be Lifted

The first step, and the most critical data when calculating load capacity, is accurately determining the mass of the object to be lifted. You should not rely solely on an estimated weight or the specifications of a single product sample.

Before selecting equipment, Vietmani recommends checking:

• Minimum and maximum mass: determine the load range the equipment will have to handle in reality.
• Variance between products: the same type of material may have weight discrepancies depending on size, specifications, or production batches.
• Mass changes during production: for example, a bag of raw materials may change in weight, or a part might have extra components added before lifting.
• Mass data sources: prioritize parameters from technical drawings, datasheets, or actual weighing results instead of visual estimations.

Some questions to answer

☐ How many kg does the object weigh?

☐ What is the maximum possible mass in kg?

☐ Are there multiple sizes or product versions?

☐ Does the mass vary between batches?

☐ Has the mass been verified with technical data or actual weighing?

Note: When designing lifting equipment, use the maximum load case in the expected working conditions as the basis for calculation, rather than relying on average values.

After determining the object's mass, the next step is accounting for the mass of the gripping tool, fixture, and accompanying accessories—components often overlooked when determining actual load capacity.

Checklist 2: Calculate the Total Load of the End-Effector

A common mistake when selecting lifting equipment is only calculating the object's mass while ignoring the weight of the End-Effector. Meanwhile, the total load the lifting mechanism must handle includes not only the material but also the gripper, fixture, and accessories attached to the equipment.

For instance, if you need to lift a 100 kg component but use a 12 kg gripper and an 8 kg fixture, the load the equipment needs to handle is actually 120 kg, not 100 kg.

Basic load checking formula

Total Load = Mass of the Object to be Lifted + Mass of the End-Effector + Mass of Accompanying Accessories

Depending on the application, an End-Effector may include:

• Mechanical grippers: internal grippers, external grippers, two-jaw grippers, or multi-point grippers.
• Fixtures: mounting frames, brackets, or object positioning mechanisms.
• Vacuum lifters: suction pads, vacuum frames, and related components.
• Hooks or lifting forks: used to hook, support, or lift materials.
• Rotating/tilting mechanisms: components that allow changing the object's orientation during operation.
• Other accessories: sensors, valves, cables, or integrated devices on the tool head assembly.

Checklist to verify

☐ Has the mass of the End-Effector been determined?

☐ Have the mounting frame, gripper, and accompanying accessories been included?

☐ Does the End-Effector change for different product types?

☐ Are there rotating, tilting, or positioning mechanisms that increase the load?

☐ Has the total load been calculated based on the heaviest configuration?

Note: For applications using custom End-Effectors, Vietmani recommends determining the mass of the entire tool head assembly from the design phase. This is a crucial basis for correctly selecting the load capacity of industrial manipulators, vacuum lifters, or other lifting solutions.

After calculating the total mass, you must proceed to check the load's center of gravity. An object with a suitable mass but an off-center center of gravity can still create significantly different working conditions for the lifting equipment.

Checklist 3: Check the Load's Center of Gravity Position

The same mass with different centers of gravity can create entirely different requirements for lifting equipment. Therefore, after determining the total load capacity, you need to check how the load is distributed and where its center of gravity lies.

Especially for large objects, asymmetrical shapes, or items requiring rotation/tilting, the center of gravity may be offset from the lifting axis. In such cases, the load not only exerts vertical force but can also generate a torque acting on the lifting mechanism and End-Effector.

What do you need to check?

• Center of gravity position: is it in the middle or offset to one side of the object?
• Distance from the center of gravity to the lifting point: the further from the lifting point, the more carefully the requirements for the lifting mechanism and fixture must be considered.
• Shape and size of the object: long, wide, or asymmetrical objects are typically harder to balance.
• Mass distribution: is the mass concentrated at one end or a specific area?
• Changes in center of gravity: does the center of gravity shift when the object is lifted, rotated, or tilted?

Quick Checklist

☐ Has the object's center of gravity been determined?

☐ Is the center of gravity on or near the lifting axis?

☐ What is the distance from the lifting point to the center of gravity?

☐ Is the load off-center when lifted?

☐ Does the center of gravity change during rotation, tilting, or moving?

☐ Is the End-Effector capable of holding the load stably in the required orientation?

Example: A 200 kg steel plate might pose no difficulty if lifted in a balanced manner at a suitable position. But if the lifting point is far from the center of gravity, the load will tend to tilt and create greater torque on the lifting mechanism. This is why the load mass cannot be considered separately from its center of gravity.

For applications with eccentric loads or requiring orientation changes, Vietmani will simultaneously evaluate the mass, center of gravity, pickup point, and object movement to determine the appropriate equipment configuration and End-Effector.

After determining the center of gravity, the next step is checking the working radius—a particularly important factor for equipment with lifting arms or cantilever mechanisms.

Checklist 4: Evaluate Load Capacity by Working Radius

Load capacity should not be evaluated solely in kilograms. For lifting equipment with arms, cantilevers, or slewing mechanisms, the distance from the lifting axis to the load position directly affects the equipment's working conditions.

The further the load is placed from the axis of rotation, the greater the load torque. Therefore, a 100 kg object handled at different radii can create varying requirements for the structure and operational capability of the equipment.

Which working radii need to be determined?

Before selecting equipment, you should check:

• Minimum radius: the closest distance the equipment needs to approach the load.
• Maximum radius: the furthest position where the equipment must lift or place the load.
• Pickup point: the actual position where the End-Effector contacts the object.
• Drop-off point: the furthest position to which the object needs to be moved.
• Distance from the axis of rotation to the load's center of gravity: especially critical for eccentric loads or large objects.

Quick Checklist

☐ Has the furthest operating position been determined?

☐ What is the maximum working radius in mm?

☐ What is the distance from the rotation axis to the load's center of gravity?

☐ Must the equipment operate at multiple different radii?

☐ Has the required load been evaluated at the most unfavorable working point?

For example, you need to lift a 150 kg component and move it from the pickup location to a production machine. If the drop-off point is significantly further from the rotation axis than the pickup point, Vietmani will not only consider the 150 kg load but also evaluate the load capacity at the maximum working radius.

Load capacity and working radius must always be considered simultaneously when selecting lifting equipment.

Especially for industrial manipulators, accurately determining the working radius helps Vietmani select the appropriate arm length, equipment configuration, and load capacity suited to the actual operating space.

After the working radius, you need to proceed with evaluating dynamic loads during lifting, lowering, and moving, because actual load conditions are not always stationary.

Checklist 5: Determine Dynamic Forces During Lifting and Lowering

In reality, a lifted object rarely remains perfectly still on the equipment. The processes of starting, lifting, lowering, moving, or stopping the load can all generate dynamic forces acting on the system. Therefore, if you only calculate the object's mass in a static state, you might not be fully assessing the actual working conditions.

In particular, sudden acceleration or stopping can cause the load to swing, generating instantaneous loads greater than in a static state. This is a factor to consider when selecting equipment for applications with high operating frequencies or rapid movement requirements.

Factors to check

• Lifting and lowering speeds: the faster the equipment operates, the more important motion control becomes.
• Horizontal travel speed: the potential for load sway during movement needs evaluation.
• Acceleration and deceleration: sudden starts or stops can create dynamic loads.
• Start-stop frequency: continuous repetitive operations can affect the equipment's working conditions.
• Potential for load sway: objects with long slings, special shapes, or unstable centers of gravity may sway more easily.
• Rotating/tilting operations: movements changing orientation can generate additional loads and torque.

Quick Checklist

☐ At what speed does the equipment lift?

☐ Is the load moved horizontally during operation?

☐ Are there frequent sudden accelerations and stops?

☐ Is the load likely to sway or swing when moving?

☐ Is there a requirement to rotate, tilt, or change the lifting object's orientation?

☐ Do lifting cycles occur continuously during the production shift?

Note: You should not arbitrarily add a fixed percentage to the load capacity to "compensate for dynamic loads". Design factors or conditions need to be determined based on the equipment type, applicable standards, movement characteristics, and specific working conditions.

For each application, Vietmani will simultaneously consider the load capacity, working radius, movement speed, and operating cycle to determine the appropriate equipment configuration. The goal is not to choose equipment with the largest possible nominal load capacity, but to select correctly for the actual operating conditions.

After evaluating dynamic loads, the next step is checking the object's orientation and direction during lifting, moving, rotating, or tilting—a factor that can directly affect the load's stability.

Checklist 6: Check the Direction and Orientation of the Object During Operation

Not all lifting applications simply involve lifting an object up and putting it down. In many production processes, you also have to move, rotate, tilt, or change the object's orientation to feed it into a machine, assemble it, or place it on a pallet. These movements can affect the load's stability and the requirements for the End-Effector.

Therefore, when calculating actual load capacity, Vietmani recommends clearly defining the direction in which the object is lifted and the posture it must maintain throughout the entire operating cycle.

Operations to check

• Vertical lifting: is the object kept balanced throughout the lifting process?
• Horizontal travel: does the load sway or rotate unintentionally?
• Rotation: is there a requirement to rotate 90°, 180°, or to a specific angle?
• Tilting: does the object need to change from a horizontal to a vertical position, or vice versa?
• Changing tilt angles: does the load need to be held at a specific angle when placed into position?
• Moving loads through narrow spaces: are the size and orientation of the object limited by machinery, frames, or surrounding equipment?

Quick Checklist

☐ In what orientation is the object picked up?

☐ In which directions must the object be moved?

☐ Is there a requirement to rotate or tilt the load?

☐ What is the maximum rotation/tilt angle?

☐ Does the center of gravity change when the object changes orientation?

☐ Does the End-Effector hold the load firmly in all required orientations?

☐ Is there a risk of collision with surrounding machinery or structures?

Example: A metal sheet may be lifted horizontally but must be rotated 90° to be fed into a machine. In this case, not only must the load capacity of the sheet be calculated, but the load-holding capability, center of gravity position, and suitable rotation mechanism must also be considered.

This is also why Vietmani does not select equipment solely based on the mass of the lifted object. From the approach direction and working posture to the rotation/tilt requirements, every factor needs to be incorporated into the design equation to ensure the equipment operates stably and properly meets the production process.

After determining the load capacity and movement characteristics, you need to proceed with checking the operating frequency and cycle to ensure the selected equipment is suitable for the actual operating intensity.

Checklist 7: Determine Operating Frequency and Working Cycle

Lifting equipment might meet the correct load capacity but still be unsuitable for the production process if it has to operate at a frequency higher than its design capability. Therefore, besides the mass and characteristics of the lifting object, you need to clearly determine how many times and for how long the equipment will work.

This forms the basis for evaluating the duty cycle and the actual utilization level of the equipment.

Information to determine

• Number of lifting/lowering cycles per hour: how many times does the equipment perform a lift and place?
• Cycle time: how long does one cycle take from picking up the load to dropping it off?
• Operating time per shift: does the equipment run continuously or is it only used in certain stages?
• Number of shifts per day: one shift, two shifts, or multi-shift operations?
• Level of repetition: do operations occur continuously with the same load type, or do they change depending on the stage?
• Rest time between cycles: does the equipment have ample resting time, or must it operate almost continuously?

Quick Checklist

☐ How many lifting/lowering cycles are there per hour?

☐ How long does one lift – move – drop cycle take?

☐ How many hours does the equipment operate per shift?

☐ How many shifts does the equipment work each day?

☐ Does the load capacity change frequently between cycles?

☐ Does the equipment have to operate continuously during production hours?

Example: Two companies both need to lift a 100 kg component. Company A only lifts it about 20 times/day, while Company B performs hundreds of cycles per shift. Although the load capacity is the same, the equipment's working conditions are entirely different and may lead to different requirements for configuration, durability, and operational capabilities.

Therefore, when submitting a consultation request to Vietmani, you should provide the maximum load capacity along with the actual operating frequency and cycle. This information helps evaluate the equipment for the specific application, rather than just relying on nominal load parameters.

Load capacity indicates how much the equipment needs to lift; the working cycle indicates how intensely the equipment must lift it.

Once you have completed the 7 steps above, you have a relatively complete dataset to evaluate the lifting problem. However, before making an investment decision, summarize the information into a single checklist to ensure no critical factor is overlooked.

Vietmani Can Support Businesses in Calculating Load Capacity Requirements

Load calculation should not stop at a single mass figure. For each application, Vietmani will work with you to review the overall lifting conditions to determine the right equipment configuration from the very beginning.

The consultation process can start from basic information such as how heavy the lifting object is, its dimensions, and where its center of gravity lies, then expand to the working radius, lifting height, handling direction, frequency, and operating cycle.

Vietmani checks each factor with you

• Determine actual load capacity: Calculate the total mass including the object, End-Effector, fixture, and related accessories.
• Analyze operating conditions: Evaluate how the load is picked up, moved, lifted/lowered, rotated, tilted, and placed in the actual process.
• Check the working radius and space: Determine the range of motion, the furthest operating position, and space limitations.
• Select appropriate lifting technology: Depending on the application characteristics, Vietmani can advise on industrial manipulators, vacuum lifters, cable balancers, or KBK/Monorail systems.
• Design End-Effectors according to the load: Grippers, fixtures, or suction pads are selected and designed based on the shape, material, center of gravity, and operating posture of the load.
• Evaluate operating conditions: Frequency, working cycle, and movement requirements are factored into the selection process so the equipment not only meets the load but also suits the production intensity.

What information should you prepare?

So that Vietmani can quickly evaluate the requirement, you can provide:

☐ Maximum mass of the object to be lifted

☐ Dimensions and shape of the lifting object

☐ Photos or videos of the current operation

☐ Pickup and drop-off locations

☐ Estimated working radius and height

☐ Rotation, tilt, or orientation change requirements

☐ Number of lifting cycles per hour/shift

☐ Installation space and environmental conditions

Based on these data, Vietmani can work with you to clarify the load requirement before moving to the equipment selection step. This helps businesses minimize the risk of choosing the wrong configuration while optimizing safety, operational efficiency, and investment costs.

Calculating the load correctly from the beginning is the first step to choosing the right lifting equipment.

Conclusion

Actual load capacity is not merely the number written on a drawing of the lifted object. To choose the right equipment, you need to simultaneously consider the object's mass, the End-Effector, center of gravity, working radius, dynamic forces, handling posture, and operating frequency.

A comprehensive checklist right from the start will help you avoid under-capacity selection, limit excess capacity investment, and enhance safety during operation.

If you are looking for a lifting solution for a specific application but are unsure which equipment to choose, Vietmani is ready to analyze the load requirements with you and advise on the appropriate configuration.

Please send Vietmani information about the object to be lifted, mass, dimensions, and handling process. We will work with you to define the requirement and find a lifting solution tailored to your production reality.