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Improving Internal Turning in a Blind Hole

Internal turning in a blind hole brings about the problem of chip exit. When the tool reaches the rear side wall, chips may be caught between the wall and the insert. This may cause insert breakage.

Two solutions follow that can eliminate this problem:
First Solution
1. Start by grooving at the rear wall.
2. Continue by turning from the inside toward the outside.

Second Solution
Start by grooving at the rear wall. Pull the tool back to the outside. Turn the final diameter from outside toward the groove.