The Retract application

Application

The Retract application allows you to disengage the tool from the workpiece after an interruption in power (e.g., retraction of a tap engaged in the workpiece).

You can also retract a tool when the working plane is tilted or retract an inclined tool.

Requirement

  • This application must be enabled by your machine manufacturer.
  • The machine parameter retractionMode (no. 124101) allows the machine manufacturer to define whether the control will display the Retract toggle switch during start-up.

Description of function

The Retract application provides the following workspaces:

The Retract application provides the following buttons in the function bar:

Button

Meaning

Retract

Retract the tool with the axis keys or the electronic handwheel

End retraction

Close the Retract application

The control opens the End retraction? window and prompts you to answer a confirmation request.

Start values

Reset the entries in the A, B, C, and Thread pitch fields to their original values

You select the Retract application by using the Retract toggle switch if the following conditions apply during start-up:

  • Power interrupted
  • No control voltage for the relay
  • The Move to ref. point application

If you have activated a feed rate limit before the power failure occurred, this feed rate limit will still be active. When you select the Retract button, the control will display a pop-up window: This window allows you to deactivate the feed rate limit.

Feed rate limit F LIMIT

The Retract workspace

The Retract workspace provides the following contents:

Row

Meaning

Traversing mode

Traverse mode for retraction:

  • Machine axes: Move in the machine coordinate system M-CS
  • Tilted system: Move in the working plane coordinate system WPL-CS (#8 / #1-01-1)
  • Thread: Move in the tool coordinate system T-CS with compensating movements of the spindle

Reference systems

Kinematics

Name of the active machine kinematics

A, B, C

Current position of the rotary axes

Effective in the Tilted system traverse mode

Thread pitch

Thread pitch from the PITCH column of tool management

Effective in the Thread traverse mode

Direct. of rotation

Direction of rotation of the thread-turning tool:

  • Right-hand thread
  • Left-hand thread

Effective in the Thread traverse mode

Coordinate system for handwheel superimposition

Coordinate system in which handwheel superimpositioning takes effect

Effective in the Tool axis traverse mode

The control selects the mode of traverse and the associated parameters automatically. If the traverse mode or the parameters have not been correctly preselected, you are able to reset them manually.

Notes

 
Notice
Caution: Danger to the tool and workpiece!
A power failure during the machining operation can cause uncontrolled “coasting” or braking of the axes. In addition, if the tool was in effect prior to the power failure, then the axes cannot be referenced after the control has been restarted. For non-referenced axes, the control takes over the last saved axis values as the current position, which can deviate from the actual position. Thus, subsequent traverse movements do not correspond to the movements prior to the power failure. If the tool is still in effect during the traverse movements, then the tool and the workpiece can sustain damage through tension!
  1. Use a low feed rate
  2. Please keep in mind that the traverse range monitoring is not available for non-referenced axes
  • Use the +, -, *, /, (, and ) keys for calculations in the numerical input fields.

Example

The power failed while a thread cutting cycle in the tilted working plane was being performed. You have to retract the tap:

  1. Switch on the power supply for control and machine
  2. The control starts the operating system. This process may take several minutes.
  3. The control displays the Power interrupted dialog in the Start/Login workspace

  1. Activate the Retract toggle switch

  1. Press OK
  2. The control compiles the PLC program.

  1. Switch the machine control voltage on
  2. The control checks the functioning of the emergency stop circuit
  3. The control opens the Retract application and displays the Assume position values? window.

  1. Compare the displayed position values with the actual position values

  1. Select OK
  2. The control closes the Assume position values? window

  1. Select the Thread traverse mode as needed
  2. Enter the thread pitch as needed
  3. Enter the direction of rotation as needed

  1. Select Retract
  2. Retract the tool with the axis keys or the handwheel

  1. Select End retraction
  2. The control opens the End retraction? window and prompts you to answer a confirmation request.

  1. If the tool was correctly retracted, select Yes
  2. The control closes the End retraction? window and the Retract application.