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How Do You Match MBWE Cartesian Robot Payload and Travel to Part Size?

2026/11/04 By le zhan

How Do You Match MBWE Cartesian Robot Payload and Travel to Part Size

When selecting an MBWE Cartesian robot, match two key specifications to the actual workpiece: payload capacity and arm reach. Larger workpieces may require heavier fixtures and a longer working radius; conversely, workpieces that are both large in volume and heavy may require a higher payload capacity but do not necessarily require an extremely long reach. The MBWE-110V, MBWE-130V, and MBWE-170V models in the MBWE series offer different payload and reach combinations, allowing manufacturers to configure the right heavy-duty take-out robot for various injection molding applications. The final selection will depend on the total weight of the workpiece and fixture, the workpiece dimensions, and the required take-out path.

What are the differences in payload capacity and model specifications among the various MBWE Cartesian robot?

Topstar’s MBWE performance comparison includes three main options: the 110V model for lighter loads, the 130V model for medium-to-heavy workpieces, and the 170V model for large, heavy workpieces. The differences in maximum payload and arm reach among these models can serve as a preliminary reference when selecting the appropriate Cartesian robot; however, the final selection must still be determined based on the actual workpiece and fixture configuration.

What are the differences in payload capacity and model specifications among the various MBWE Cartesian robot

What are the differences in payload and arm reach among the various models?

The specifications for these three configurations are as follows:

ModelMaximum payloadArm stroke optionsMain-arm fore-and-aft stroke
MBWE-110V8 kg1200 / 1400 mm930 mm
MBWE-130V15 kg (20 kg configuration)1300 / 1500 / 1700 mm1000 mm
MBWE-170V25 kg (30 kg configuration)1700 / 2000 / 2300 mm1500 mm

These differences define three practical selection ranges:

  • MBWE-110V: Suitable for lighter workpieces and compact retrieval applications, with a maximum payload capacity of 8 kg.
  • MBWE-130V: Offers higher payload capacity and longer reach options, suitable for medium- to large-sized products and heavier fixtures.
  • MBWE-170V: Designed for heavier workpieces and longer-reach requirements, with payload configurations up to 25 kg or 30 kg.

Arm reach and the main arm’s forward-backward travel are distinct specification parameters. When selecting a model, verify these two parameters based on the actual mold conditions and the robot’s installation layout.

How is the actual payload of an MBWE Cartesian robot calculated?

A common misconception among customers during the selection process is to consider only the weight of the molded product. In actual applications, the robot must support the entire end-effector (end-of-arm tooling) assembly.

The calculation of the actual payload should include:

Workpiece weight + tooling weight + mounting plate + suction cup + cylinder + sensors and other components being carried.

For example, if an automotive plastic part weighs 6 kg and its gripper and mounting structure weigh 2 kg, the total load is 8 kg. This already reaches the MBWE-110V’s rated maximum load, leaving no capacity for additional components and preventing it from meeting dynamic operation requirements. In this case, the MBWE-130V would be a better choice.

Engineers should also consider the workpiece’s center of gravity. If the workpiece is long and the gripping point sits away from the robot arm’s center, it generates a greater mechanical load during acceleration and deceleration than a workpiece of the same weight but with a more compact structure.

Therefore, when selecting a load capacity, consider both total mass and load distribution. If the total load is close to the rated capacity, the center of gravity is significantly offset, or the fixture requires a long reach, consider selecting a model with a higher load capacity and verify the allowable load torque.

How is the actual payload of an MBWE Cartesian robot calculated

How Should a Robotic Arm’s Reach Be Matched to Workpiece Dimensions and Retrieval Requirements?

Load capacity alone is insufficient to determine whether a robot can perform the required retrieval motion. The robotic arm must reach a specified location within the mold, safely retrieve the product, and transport it to a predetermined placement point or downstream station. For large workpieces, the required range of motion also depends on the mold depth, opening space, product orientation, and fixture dimensions. Therefore, when selecting a robotic arm reach, you cannot simply match it to the physical length of the workpiece; instead, you must evaluate the entire motion path.

How Should a Robotic Arm’s Reach Be Matched to Workpiece Dimensions and Retrieval Requirements

How Do Workpiece Dimensions and Mold Geometry Affect the Selection of a Cartesian Robotic Arm’s Reach?

A longer workpiece does not necessarily require the longest robotic arm reach. The key is whether the pick-and-place robot can reach the gripping position, remove the product from the mold, and complete the motion while avoiding surrounding structures.

Therefore, before determining the reach, evaluate the following three factors:

  1. Mold depth and removal position: The robotic arm must reach the target position inside the mold and safely remove the workpiece.
  2. Workpiece Dimensions and Gripper Design: Large or irregularly shaped workpieces may require a longer gripping structure, thereby increasing the required clearance space.
  3. Conveyance Distance: The robot must reach the designated unloading or placement location. If the required distance exceeds the existing stroke range, reevaluate the installation layout or consider adding extra axes.

For example, a large but lightweight home appliance housing—despite its modest total weight—may require a longer robotic arm reach due to its large dimensions. Conversely, compact metal inserts or heavier plastic parts, while demanding higher payload capacity, may require only a moderate reach.

The MBWE-170V model offers a reach of up to 2300 mm; by comparison, the MBWE-130V has a reach of 1700 mm, while the MBWE-110V has a reach of 1400 mm. This provides greater flexibility for various workshops when handling large products or working with deep mold structures.

How Do Workpiece Dimensions and Mold Geometry Affect the Selection of a Cartesian Robotic Arm’s Reach

When Should You Choose an MBWE Cartesian Robot with a Higher Payload or Longer Stroke Configuration?

When making your final selection, consider the workpiece weight, fixture design, and the entire retrieval path. Please refer to the following practical application scenarios:

Situations where the MBWE-110V is recommended:

  • The total load of the workpiece and fixture is within 8 kg, with ample margin.
  • A 1200 mm or 1400 mm arm reach is sufficient to access the mold and retrieve the workpiece.
  • The application involves relatively compact product dimensions, and the retrieval motion is relatively simple.

When to choose the MBWE-130V:

  • The application requires a load capacity above the 110V configuration limit.
  • The workpiece or fixture requires a longer arm reach.
  • Stroke options of 1300 mm, 1500 mm, or 1700 mm provide sufficient working range to cover the mold area and subsequent handling layout.

When to choose the MBWE-170V:

  • The total payload requirement is 25 kg (or 30 kg with the optional upgrade).
  • Workpieces are large, or the fixture structure is long, requiring a longer travel range.
  • The application requires a 1700 mm, 2000 mm, or 2300 mm arm reach, as well as a 1500 mm main arm fore-and-aft travel.

If the workpiece has an offset center of gravity, the fixture adds significant weight, or the operation requires high-intensity acceleration and deceleration, consider a model with a higher load capacity.

Making the Final Selection

Before selecting the MBWE injection molding robot model, verify the entire handling process under actual operating conditions, including entering the mold, gripping, exiting, leaving the mold area, transporting, and placing. Comprehensively evaluate the payload, stroke, installation space, and required cycle time.

Ultimately, matching the right MBWE Cartesian robot to a workpiece requires two complementary decisions: first, ensuring the payload capacity is sufficient to handle the combined weight of the workpiece and fixture; and second, ensuring the arm’s reach is sufficient to safely complete all required movements. The MBWE-110V, 130V, and 170V models offer different combinations of these capabilities, enabling manufacturers to select a heavy-duty take-out robot based on their actual production needs, rather than simply choosing the model with the highest specifications.

 

 

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