Saturday, April 25, 2015

FANUC's amazing Retract and Recover

CNC engineering
Retract an Recover path

Using this very powerful option, a tool can easily be manipulated from a complex part with multiple X and Z-axis movements in order to work around obstructions in the features of the part and then follow the exact path automatically when returned to restart the machining operation from where it left off.  
This is an option and must already be installed on your controls. If it is not FANUC will charge a fee to turn the necessary parameters on.
The following basic steps must be followed in order for the tool to return properly.

Retract: 
  1. Automatic operation is interrupted by pressing the feed hold button. You should let the spindle rotate a few times in order to reduce tool pressure.
  2. Now press the retract button.
  3. Switch the mode switch to rapid.
  4. Make no more than 10 different moves UP and AWAY from the part.
  5. Press the retract button until it flashes.
  6. Press cycle stop.
  7. Change your inserts. 

Recover:
  1. Turn down your rapid over ride and your feed over ride switches. 
  2. Press recover. 
  3. Press Cycle Start. 
  4. Turn up your feed rate slowly and let the machine follow the original path to the correct position.

Often it is thought that there is nothing you can do when a machine is in tapping mode but let it finish tapping a grit your teeth or hit emergency stop but with retract and recover you can stop tapping instantly and retract out of a hole when you press retract. The machine will rigid tap backwards out of the hole.

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