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Driven by rising labor costs and the push for electronics-assembly automation, more and more plants are replacing manual screw driving with automatic screw-driving machines. Electronic devices often rely on micro screws whose threaded length (L) plus head thickness (T) divided by head diameter (D) is ≤ 1.3—so-called small-aspect-ratio screws. When (L+T)/D ≤ 1.5, blow-feed systems tend to flip or mis-orient the screw, causing jams and frequent machine alarms. Vacuum pick-up is therefore mandatory.

Danikor offers a dedicated small-aspect-ratio micro-screw feeding module that is:

? Simple in construction—stable feeding without flipping, stacking, or jamming
? Flexibly mounted—no positional constraints, easy cell layout
? Modular and compact—suited for high-volume production

Combined with a tightening module, the unit forms an automatic screw-driving cell controlled by:

1. Host PC (HMI) – stores job data, handles operator interaction

2. Motion-control card – executes commands, collects feedback

3. Robot axes – move the driver to each target hole

4. Functional modules – tighten, reset, feed, clamp, vacuum, etc.

Sequence of operation

1. Power-on: system loads default parameters.

2. Operator places the workpiece on the loading platform and selects the product model; the controller auto-generates the machining program.
   ? New model: create part number, enter data, save.

3. Servo axis positions the smart driver; vacuum nozzle picks up a screw; the robot drives to the specified hole and tightens.

4. Motion-control card continuously reads feedback from the driver and feeder; torque-OK signals confirm each joint; results are displayed in real time.

5. When all screws are complete, the platform ejects the part.
   ? Missing or failed screws trigger an alarm and display the hole number for manual re-work.

Quality gate

Before tightening, the target torque is set in the smart driver. When the driver reaches the set value it sends a “torque-OK” signal to the motion-control card. If the card receives the OK within the programmed window, the joint is accepted; otherwise the hole is flagged and an alarm prompts manual repair.

The cell thus achieves fast, reliable driving of screws with aspect ratios below 1.5—fully automatic, fully traceable.