3D Vision‑Guided Pin Loading & Unloading: Efficient Single‑Camera Dual‑Station Solution

In machining‑focused automation retrofits, batch loading and unloading of cylindrical pin‑type workpieces represents a typical real‑world deployment scenario. Manual feeding suffers from efficiency bottlenecks and high labor costs, while conventional rigid positioning lacks flexibility and struggles to accommodate production requirements for multi‑specification bulk incoming materials.

Recently, Transfer Technology has deployed a 3D vision‑enabled intelligent loading‑and‑unloading system for machining applications. A single camera covers dual‑station operations. While keeping solution costs in check, the system delivers stable recognition, precise picking and high‑efficiency cyclic operation for pin workpieces.

This project handles two variants of metallic pin workpieces with bin‑based material feeding. An electromagnetic chuck serves as the end effector for picking. Workpieces are unloaded onto a secondary positioning platform before proceeding to subsequent machining procedures.

The production site features a dual‑station layout, with clear core requirements from the customer:

• Guarantee visual positioning accuracy and recognition stability to support long‑term continuous production‑line operation;

• Maximize station‑level operational efficiency to align with overall production‑line takt time;

• Maintain reasonable capital expenditure for the vision solution, balancing cost‑effectiveness and reliability.

A traditional single‑station solution brings lengthy idle‑waiting periods for cameras and robots, leading to low equipment utilization. Deploying two cameras, by contrast, adds hardware expenses and maintenance workload. Achieving an optimal balance between efficiency and cost constitutes the core design challenge for this project.

Solution

Tailored to on‑site working conditions, this solution adopts Transfer Technology’s Epic Eye Laser L V2S 3D industrial camera paired with a mobile module to realize single‑camera dual‑station operation. One camera works with one industrial robot to cover two bin stations. Overall operational efficiency is elevated via parallel‑alternating “recognition‑picking” logic.

The complete system follows a straightforward operating sequence:

1. 1.The mobile module moves the 3D camera directly above the target station. Upon receiving the photographing command from the PLC, it rapidly completes scanning and imaging.

1. 1.The vision system computes workpiece position and pose data. Data is forwarded to the robot through the PLC to guide the electromagnetic chuck to perform picking and unloading.

1. 1.While the robot executes its task, the camera travels to the other station to run recognition, enabling both workflows to proceed in parallel.

Mounted 1300 mm above the top of the bin, the camera’s single field‑of‑view fully covers the bin. The solution can be rolled out without major alterations to the existing production‑line layout.

Measured Performance

Following on‑site installation and commissioning, all core performance metrics of this 3D vision system consistently meet design specifications and fit on‑site production requirements:

• Visual recognition accuracy ≤ ±0.5 mm
• Workpiece recognition rate ≥ 99.9 %
• Single‑station vision cycle time ≤ 6 s

Targeted imaging optimizations are implemented for metallic workpieces. Complete point‑cloud data can be reliably obtained under regular incoming‑material conditions. The system also features an exception‑handling mechanism: one‑off recognition failure automatically triggers re‑capture for up to two retries. Consecutive recognition failures activate a shutdown alarm for manual intervention, striking a balance between operational efficiency and production‑line safety.

Value Delivered

This single‑camera dual‑station 3D vision solution delivers tangible on‑site benefits for end‑users: First, marked efficiency gains. The dual‑station parallel‑alternating operating mode keeps both camera and robot running continuously. Overall production‑line takt time outperforms single‑station setups and supports 7×24‑hour non‑stop production.

Second, well‑controlled costs. Only one 3D camera handles dual‑station tasks, cutting hardware investment versus dual‑camera deployments. Its streamlined architecture also lowers daily maintenance complexity and related expenses.

Third, stable and dependable operation. Robust exception‑handling logic, together with standardized on‑site operational training and after‑sales technical support, sustains long‑term system stability and mitigates production‑line downtime risks.

As automation upgrades advance across the machining sector, demand for loading and unloading of shaft‑type and cylindrical workpieces will keep rising. Transfer Technology will continue to advance 3D industrial vision technology, refine scenario‑specific industry solutions, and supply stable, efficient and cost‑effective vision solutions for more manufacturing enterprises.