This project uses an inline dual-head automatic screwdriving system to complete multi-point fastening on a large electronic assembly.
The product arrives at the fastening station with multiple circuit boards, connectors, wiring, and internal components already installed inside the metal housing. Screw positions are distributed across different areas of the assembly, requiring the fastening tools to move over a relatively large working envelope while reaching into the enclosure at each programmed location.
The CR-4000C combines an inline transfer platform, product positioning, a gantry motion system, and two vertical screwdriving units to complete these fastening operations automatically.
Inline Positioning of the Electronic Assembly
The product is handled as part of an inline production process.
After entering the screw fastening station, the electronic assembly is positioned beneath the overhead gantry. The housing remains supported at the station while the fastening mechanism moves above it.
This arrangement is particularly suitable for larger products because the complete assembly does not need to be moved manually from one screw location to another.
Once the workpiece reaches the required position, the automatic screwdriving sequence can begin.
The process flow is:
product transfer → station positioning → automatic screw fastening → release to the next process
Dual Screwdriving Heads on a Gantry Platform
The fastening unit uses two vertically mounted screwdriving heads installed on the gantry system.
The gantry provides horizontal movement across the product, allowing the screwdrivers to reach fastening locations distributed throughout the enclosure.
At each programmed position, the corresponding screwdriving head moves above the target point and lowers toward the component.
The fastening cycle follows a repeated sequence:
move to screw position → align fastening head → lower spindle → tighten screw → retract spindle → move to next position
Because the fastening locations are distributed across different modules, the gantry continuously changes position during the cycle rather than operating at one fixed point.
The dual-head configuration also provides additional flexibility when several fastening operations are required within the same assembly.
Multi-Point Fastening Inside the Product Housing
The electronic assembly shown in the project contains several internal PCB modules and other electrical components.
Many of the screw positions are located inside the metal housing rather than on an open external surface. The screwdriving units therefore need sufficient vertical travel to enter the enclosure and reach the fastening points.
The overhead architecture keeps most of the motion system above the product while the fastening spindles descend into the required locations.
This allows the system to work around existing components and complete screws positioned across a relatively large internal assembly area.
Instead of manually moving a handheld screwdriver between numerous fastening locations, the machine stores these coordinates as part of the automated process.
Repeated Screwdriving Across Multiple PCB and Module Positions
Several similar electronic modules are arranged within the product.
The machine moves sequentially between these areas and performs the required screwdriving operations at the corresponding positions.
For products containing repeated PCB layouts or multiple internal modules, this programmable positioning is particularly useful. The fastening sequence can follow the physical arrangement of the components while the product itself remains stationary.
The overall sequence becomes:
position product → fasten first module → move to next fastening area → complete additional screws → repeat across the assembly
This converts a repetitive manual fastening operation into a controlled multi-position process.
Integrating Screw Fastening into the Assembly Line
The CR-4000C is designed as an inline screw fastening station, rather than a standalone manual workstation.
This allows automatic screwdriving to be inserted between upstream and downstream assembly processes.
The upstream station can complete component installation before the product enters the fastening area. Once all programmed screws have been completed, the assembly can continue to inspection, testing, or the next production operation.
A typical line sequence can therefore be arranged as:
component assembly → inline transfer → automatic screw fastening → inspection or downstream assembly
This type of integration reduces separate material handling between processes and keeps fastening within the normal production flow.
Automated Fastening for Large Electronic Products
Large electronic products often contain many screws distributed across several PCBs, brackets, connectors, and internal modules.
Automating these operations requires more than simply replacing a handheld screwdriver with a powered spindle. The system must also control product positioning, XY movement, vertical tool access, and the sequence of individual fastening locations.
In this project, the CR-4000C brings these functions together in one inline station.
The gantry covers the working area of the enclosure, the dual screwdriving heads perform the fastening operations, and the inline platform connects the station with the surrounding assembly process.
The result is a programmable multi-point screw fastening process for large electronic assemblies, suitable for production environments where repeated screwdriving is distributed across a wide product area.