Material Handling

Turntable Design for Safe Handling and Inspection of Tailgates and Glass Panels

The client is a well-established company with over 20 years of experience in developing fully automated systems. They cater to a wide range of automotive OEMs and Tier-1 suppliers, providing tailored automation solutions based on the unique requirements of each production line.

Scope

The client approached us to design a turntable for tailgate and glass handling. The turntable system needed to be compact and capable of handling three tailgates with glass panels, moving smoothly across three stations: Loading, Inspection and Unloading.

The system had to index precisely between stations and include a mechanical lock to prevent movement during operations, ensuring safe and accurate tailgate inspection.

Challenge

Designing a safe and compact turntable for automated inspection of tailgate and glass handling presented several engineering challenges:

  • Secure Clamping Without Distortion: One of the main challenges was designing a fixture that could hold the tailgate, already integrated with glass, firmly in place without causing any deformation. The grip had to be strong enough for stability yet gentle enough to avoid stressing or damaging the part.
  • Strict Weight Limit for Load Handling: The total weight of the rotating assembly, including the fixture, tailgate, frame, and locking mechanisms, had to stay under 1.2 tons. The motor and gearbox also had to be strong enough to handle an extra 100 kg in the future, while still meeting all safety requirements.
  • Precision Indexing with Foolproof Locking: The turntable needed to rotate precisely between the three stations and lock securely at each position. This was essential to maintain alignment and to ensure there was no unwanted movement during processes like sealing or inspection.
  • Compact Design: The entire system had to be compact enough to fit within the client's existing production layout. This needed careful planning to make sure the system didn’t block operator access, nearby machines or workflow.
Station Turntable for Glass + Tailgate Handling

Solution

After a series of in-depth discussions with the client and a detailed review of their floor plan, operational flow and safety requirements, Sedin Engineering team developed a custom turntable system designed for efficient handling of glass-fitted tailgates.

Leveraging our strong expertise in industrial automation services for material handling, we designed a solution that focused on safety, accuracy, compact size and weight limits, while also making sure it could be easily upgraded in the future.

1. Compact Turntable Frame with Triangular Layout

To meet the strict space constraints of the client's factory, the turntable was designed in a triangular configuration, enabling three working stations within a minimal footprint. This geometry not only reduced rotational travel between stations (120° indexing) but also provided stable weight distribution and easy operator access on all sides.

The frame was designed for strength-to-weight optimization, supporting the fixture assemblies while maintaining structural integrity under repeated dynamic loads.

2. Three-Station Fixture Assembly Design

In the fixture assembly, Station A was designated to load the tailgate with glass, Station B was for inspection and Station C was for unloading the finished part. Each of these three stations had the same fixture setup. This made the process simpler and reduced the need for additional training or setup changes. The fixture design included:

  • Four precision-machined nest blocks to hold the tailgate in place
  • Two vacuum cap systems for gentle handling and support of the glass panel
  • Four mechanical hooks and a clamping assembly to firmly secure the tailgate without inducing stress or distortion
  • A rough locator for easy initial positioning
  • A distance sensor to detect and verify the presence of the tailgate and glass assembly

These features ensured repeatable positioning, minimal operator effort and damage-free handling, even in high-throughput environments.

3. Safety-Locking and Sensor Integration

To ensure complete positional accuracy and prevent movement during manual handling or inspection, an external locking assembly was integrated at each station. This lock is sensor-monitored using proximity switches, ensuring the turntable is fully secured before any operation is initiated. This feature meets the client’s safety and foolproofing requirements, reducing the risk of accidental rotation or misalignment during the process.

4. Motor-Gearbox Selection with Built-In Future Capacity

The turntable was powered by a high-torque motor and precision gearbox carefully selected to handle the complete system load of 1.2 tons. Importantly, the drivetrain was sized with an additional 100 kg capacity in mind. This allowed the client to integrate future components or upgrades without overloading the system.

Before finalizing the turntable design, our team considered the following factors:

  • Required torque at each indexing point
  • Speed and acceleration profiles
  • Duty cycles and load inertia
  • A standard factor of safety (FOS) for all real-world conditions

This proactive approach ensured long-term reliability with zero risk of performance degradation.

5. Compliance with DFMEA, Ergonomics and Client Standards

All components and assemblies were validated through a thorough Design Failure Mode and Effects Analysis (DFMEA) process, reducing the chance of in-field failure or rework. The entire system was also reviewed against the client’s ergonomic and safety standards, ensuring:

  • Easy operator access and minimal bending/reaching
  • Clear line-of-sight for inspections
  • Sensor-driven safety interlocks at all critical points

Additionally, the weight distribution and fixture ergonomics made it easy for operators to handle components without fatigue. This contributed to a safer and more efficient work environment. With the help of Sedin’s cost-effective and state-of-the-art idea, the entire machine was able to work continuously without any hassles, thereby increasing productivity.

3D Modeling of Station Turntable for Glass+Tailgate Handling

Value and Benefits

The three-station layout allowed loading, inspection, and unloading to happen at the same time. This parallel processing reduced cycle time and significantly boosted output.

The turntable was compact enough to fit into the client’s existing floor space, avoiding the need for facility changes. It was also designed with extra capacity, saving future upgrade costs.

With precise indexing and sensor-based safety locks, the system ran smoothly with minimal downtime and fewer handling issues, reducing costly delays and rework.

The design followed proper ergonomic and safety standards, making it easier and safer for operators to use.

By delivering a well-engineered, high-quality solution, we earned the client’s trust as a valuable design partner for future automation projects.

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Sedin Engineering is the division of Sedin Technologies. We offer multidisciplinary and holistic engineering design services across product development, plant design & engineering, industrial automation, structural, civil, electrical, wiring and harness design. Our agenda is to enable engineering brilliance.

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