The CR-4000C is an inline automatic screw fastening system designed to complete multiple screwdriving operations on a large electronic module within the production flow.
In this project, the workpiece is a large metal enclosure containing multiple PCB assemblies, electrical components, and internal connection points. The fastening positions are distributed across different areas inside the housing, requiring the screwdriver system to move between multiple coordinates while maintaining access to components installed at different positions.
To handle this process, we used a gantry-based fastening system equipped with two independent screwdriving heads. The fastening assembly moves across the workpiece, aligns with the programmed screw positions, lowers the corresponding spindle, completes the fastening operation, and then continues to the next position.
The result is an automated multi-point screw fastening process that can be integrated directly into an electronic assembly line.
Dual-Head Screwdriving Across Multiple Fastening Positions
The most visible feature of the CR-4000C is its dual-head fastening arrangement.
Two vertical screwdriving units are mounted on the moving gantry above the product. As the machine runs, the fastening heads travel across the enclosure and stop above the required assembly positions.
The workpiece contains several PCB modules arranged side by side, together with other electrical and mechanical components. Screw locations are therefore spread over a relatively large working area rather than concentrated at a single point.
The gantry motion allows the fastening system to reach these different coordinates without manually repositioning the complete product.
At each programmed location, the fastening spindle descends toward the assembly, performs the screwdriving operation, retracts, and then moves to the next position.
Using two fastening heads also provides more flexibility when multiple screw locations must be processed within the same assembly cycle.
Fastening Directly Inside a Large Electronic Housing
Unlike small desktop screwdriving applications, this project requires the fastening tool to work inside a deep metal enclosure.
The housing already contains multiple circuit boards, wiring, connectors, and other installed components. This creates a more constrained working environment because the fastening tool must reach individual screw locations without interfering with adjacent parts.
The vertical fastening axes provide the required reach into the enclosure, while the overhead gantry positions the tool above each target location.
The sequence visible in the video repeatedly combines horizontal positioning with vertical approach:
Gantry movement → alignment above screw location → spindle descent → screw fastening → spindle retraction → movement to the next position
This allows multiple fastening points distributed throughout the electronic assembly to be completed automatically while the main product remains in a fixed production position.
Inline Integration Instead of a Separate Manual Screw Station
The CR-4000C is configured as an inline fastening station, allowing screwdriving to become part of the continuous assembly process rather than a separate offline operation.
The electronic enclosure remains supported at the production station while the overhead fastening mechanism performs the programmed screw sequence.
This architecture is particularly useful for large assemblies. Moving a heavy or complex electronic enclosure repeatedly between individual manual fastening positions would add unnecessary handling. With the gantry system, the workpiece can remain stationary while the fastening tools move to the required coordinates.
Once all programmed fastening positions have been completed, the assembly can continue to the next production process.
For an automated production line, this creates a straightforward handoff between operations:
Upstream assembly → workpiece positioning → automatic multi-point screw fastening → downstream process
The screw fastening station therefore becomes one process module within the larger production line.
Automating Repetitive Multi-Point Screw Fastening
Large electronic assemblies can contain many screws distributed across PCB modules, brackets, electrical components, and internal mounting structures.
When these screws are installed manually, the operator must repeatedly locate each fastening point, position the screwdriver, complete the fastening operation, and move across the enclosure.
The CR-4000C automates this repetitive movement through programmed positioning.
Once the workpiece is located at the fastening station, the gantry carries the screwdriving heads between the required locations. The vertical axes then perform the approach and fastening action at each point.
This separates the process into two coordinated functions: the gantry handles multi-position movement across the assembly, while the fastening heads perform the actual screw locking operation.
The arrangement is particularly suited to products where screw locations are distributed over a large XY working area.
Dual-Head Inline Fastening for Electronic Assembly Automation
This project demonstrates an automated fastening approach for complex electronic products that already contain multiple internal modules before screw locking begins.
The system combines a large gantry working range, dual screwdriving heads, vertical fastening motion, and inline production integration in one automated station.
During operation, the CR-4000C moves continuously between multiple screw positions inside the enclosure and completes the fastening sequence without requiring an operator to manually reposition the screwdriver for every screw.
For production lines involving power electronics, industrial electronic assemblies, control units, or other large multi-component enclosures, the same automation concept can be used to replace repetitive multi-point manual screwdriving with a programmable inline fastening process.