During internal threading, what should the operator do once the required threaded length in the hole is reached?

During internal threading, what should the operator do once the required threaded length in the hole is reached?

• A. Quickly move the cutting tool away from the thread toward the workpiece axis and back out of the hole
• B. Keep the tool in place and retract slowly
• C. Reverse the spindle and withdraw completely
• D. Rotate the tool to reset position

Answer: (A)

End-of-depth withdrawal should clear the finished thread to protect both the cut and the tool. Quickly moving the cutter toward the workpiece axis reduces contact with the freshly cut thread walls, then retracting the tool out of the hole ensures you’re no longer engaging the thread. This fast, two-step move minimizes rubbing, chatter, and potential damage, and sets you up for the next operation or part inspection. Keeping the tool in place or retracting slowly would continue cutting or drag along the thread, while reversing the spindle or rotating to reset doesn’t address safe withdrawal.

End-of-depth withdrawal should clear the finished thread to protect both the cut and the tool. Quickly moving the cutter toward the workpiece axis reduces contact with the freshly cut thread walls, then retracting the tool out of the hole ensures you’re no longer engaging the thread. This fast, two-step move minimizes rubbing, chatter, and potential damage, and sets you up for the next operation or part inspection. Keeping the tool in place or retracting slowly would continue cutting or drag along the thread, while reversing the spindle or rotating to reset doesn’t address safe withdrawal.