AFC toggle switch in Program Run operating mode

Application

The AFC toggle switch allows you to activate or deactivate Adaptive Feed Control (AFC) in the Program Run operating mode.

Requirements

  • Adaptive Feed Control (AFC, software option 45)
  • Enabled by the machine manufacturer
  • The machine manufacturer uses the optional machine parameter Enable (no. 120001) to define whether you can use AFC.

Description of function

The AFC toggle switch must be activated for the NC functions for AFC to have an effect.

If you do not specifically deactivate AFC using the toggle switch, AFC remains active. The control remembers the setting of the toggle switch even if the control is restarted.

If the AFC toggle switch is active, the control displays an icon in the Positions workspace. In addition to the current setting of the feed rate potentiometer, the control shows the controlled feed value as a percentage (%).

Positions workspace

Notes

 
Notice
Caution: Danger to the tool and workpiece!
As soon as the AFC function is deactivated, the control immediately switches back to the programmed machining feed rate. If AFC decreased the feed rate (e.g. due to wear) before it was deactivated, the control accelerates the feed rate up to the programmed value. This applies regardless of how the function is deactivated (e.g. feed rate potentiometer). This acceleration may result in damages to the tool or the workpiece!
  1. If it is imminent that the feed rate falls below the FMIN value, stop the machining operation (instead of deactivating the AFC function)
  2. Define the overload response for cases in which the feed rate falls below the FMIN value
  • If Adaptive Feed Control is active in Control mode, the control internally sets the spindle override to 100%. This means that you can no longer change the spindle speed.
  • If adaptive feed control is active in Control mode, the control loads the value from the feed-rate override function.
    • Increasing the feed-rate override has no influence on the control.
    • If you reduce the feed override with the potentiometer by more than 10% in relation to the position at the start of the program, the control switches AFC off.
    • You can reactivate control with the AFC toggle switch.

    • Potentiometer values of up to 50% always have an effect, even with active control.
  • Mid-program startup is allowed during active feed control. The control takes the cutting number of the startup block in account.