# System Description

The Fixtured Screw Feeding System consists of the Fixtured Tightening Module, Driving Tool, Power Focus 6000, Feeder, external Valve Control Unit, cables, and hoses. It is part of Atlas Copco’s Smart Connected Assembly concept and supports industrial production environments to become more efficient, ergonomic, and maximize the production output.

## Fixtured Tightening Module

The Fixtured Tightening Module carries out the automatic feeding process. It consists of the following parts:

- Feeding Head

- Head-stroke and Bit-stroke version for fixed stations

- Bit-stroke version for robot/cobot

The Fixtured Tightening Module components and functions are explained in the table below:

No | Components | Functions
1 | Bit | Transmits the Torque to the screw.
2 | Aligning Jaws | Guides the air-blown screw during the screw tightening process. The Aligning Jaws are connected to their holders with tension pins. The spring in the holders closes the Aligning Jaws.
3 | Swivel Arm | Holds and loads the next screw while the previous screw is being tightened. The Swivel Arm guides the air-blown screws into the Aligning Jaws of the Feeding Head while it is in the loading position. In the working position, the Swivel Arm is swirled out by the Bit movement.
4 | Feeding Head (in blue color) | Receives the screws through the swivel arm. The Aligning Jaws attached to the jaw holders, and thereby the feeding head guide the shift, and hold the screw in place for the bit to engage.
5 | Swivel Arm Holder | Holds the Swivel Arm.
6 | Quick-change Coupling | Helps to change the Feeding Head and Bit Assembly.
7 | Feeding Tube Connector | Connects the Feeding Tube.
8 | Sleeve | Helps to change the angle positions of the Feeding Head. Using these screws, the angle positions of the Feeding Head can be changed in -45°, -90°, 0°, 45°, and 90° degrees. Refer to the Angle Positions of the Feeding Head image below the table.
9 | Feeding Tube | Transports the screws from the Screw Feeding Unit to the Swivel Arm by the pressurized air.
10 | Ring Sensor | Detects the screw at the end of the Feeding Tube.
11 | Inductive Sensor | Detects whether the Bit is completely retracted.
12 | Stroke Position Sensor | Detects the position of the Bit-stroke.

Bit-stroke version

The Bit-stroke only allows movement of the Bit in the front to push the screw through the jaws. It is used and mounted on robots or Cartesian slides that provide the Z-axis motion to the part.

Description | Value
Total weight including QST34 Driving Tool | 4.3 kg
Total weight without Driving Tool | 4.3 kg – 2 kg = 2.3 kg
Maximum Torque of the Screw Feeding Head | 10 Nm

- Head-stroke version

The Head-stroke provides additional axis movement to bring the Feeding Head closer towards the tightening location. Thereby, the motor stays stationary and only the Feeding Head moves. It is used and mounted in stand-alone cell assembly and palletized assembly lines.

Description | Value
Head-stroke | 48 mm
Total weight including QST34 Driving Tool | 6 kg
Total weight without Driving Tool | 6 kg - 2 kg = 4 kg
Maximum Torque of the Feeding Head | 10 Nm

## Driving Tool

The Driving Tool generates the rotary motion and provides Torque which is transmitted to the Feeding Head via the Drive Shaft.

No. | Component | Function
1 | Drive Shaft | Geared shaft of the rotary drive

The different part numbers, model numbers, torque range, and speed of fixtured driving tools are specified in the below table:

Part Number | Model Number | Torque Range (Nm) | Speed (rpm)
8434320084 | ETF SL21-01-226-SF | 0.3-1.2 | 3000
8434320085 | ETF SL21-04-226-SF | 0.8-4 | 1600
8434320086 | ETF SL21-07-226-SF | 1.5-7.5 | 970
8434320087 | ETF SL21-10-226-SF | 2-10 | 720
8434320088 | ETF SL21-01-256-SF | 0.3-1.2 | 3000
8434320089 | ETF SL21-04-256-SF | 0.8-4 | 1600
8434320090 | ETF SL21-07-256-SF | 1.5-7.5 | 970
8434320091 | ETF SL21-10-256-SF | 2-10 | 720

Part Number | Model Number | Torque Range (Nm) | Speed (rpm)
4028001007 | QST34-20CT-SF-226 | 4 - 20 | 1000
4028001016 | QST34-20CT-SF-256 | 4 - 20 | 1000
4028001017 | QST34-20CTTA-SF-226 | 4 - 20 | 1000
4028001022 | QST34-20CTTA-SF-256 | 4 - 20 | 1000
4028001014 | QST34-8CT-SF-226 | 2 - 8 | 3000
4028001015 | QST34-8CT-SF-256 | 2 - 8 | 3000
4028001020 | QST34-8CTTA-SF-226 | 2 - 8 | 3000
4028001021 | QST34-8CTTA-SF-256 | 2 - 8 | 3000

In this Section

- Main Components of the Fixtured Screw Feeding System

## Applies to: