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Thread turning

Thread turning
 
 

Thread turning is a demanding operation, where good chip control, consistent tool life and consistent component quality can be difficult to achieve.

The thread turning tool makes a number of passes to generate a thread on the workpiece. By dividing the full cutting depth of the thread into a series of small cuts, the sensitive nose radius of the insert is not overloaded.

External thread turning

External thread turning is often easier and less demanding on the tool than internal thread turning and there are a number of different methods which can be used to achieve the desired results.

To consider for external thread turning:

  • The feed rate must be equal the pitch of the thread
  • Choose an adequate number of thread cutting passes and depth of cuts
  • Chip formation, to avoid chips clogging around the tool and/or component
  • Avoid vibration caused by long tool overhangs and slender components
  • Tool alignment and centre height
 
 
 

​Internal thread turning

​Internal thread turning is more demanding than external thread turning, due to high need of efficient chip evacuation and that the tools often need to be longer and more slender.

​ To consider for internal thread turning:

  • Chip evacuation, especially in blind holes, is helped by using left-hand tools for right-hand threads and vice versa (pull-threading). However, this also creates higher risk of insert movement
  • Use modified flank infeed to generate a spiral chip, which is easy to guide towards the entry of the bore
  • Choose an adequate number of thread cutting passes and depth of cuts
  • Avoid vibration caused by long tool overhangs
  • Tool alignment and centre height
  • If a long tool is needed for reach, use a carbide or dampened tool to minimize vibrations


Tool alignment and centre height is
important for a good threading process
 

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