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       This step shows how to impose a synchronization between the two machining operations. | |
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       1. | Click Create Synchronization
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| 2. | Select the External Roughing operation then the Drilling operation in the PPR tree. | |
| 3. | In the Synchronization Editor that appears, set the 
       synchronization position for the Upper Turret to Before retract 
       macro. 
        Click OK to confirm the synchronization.  | 
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