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Chip-breaking operation when an existing hole diameter is increased by a rotary cutter.

Illustration of Boring

The process

A shaft [1] is squeezed up through the hole whose diameter is to be increased. The shaft has a tool holder with a cutting insert [2] mounted which by rotation and axial movement cuts the hole wall.

Depending on the detail design and size you can also perform the operation with a chuck instead of a shaft.

Advantages and disadvantages
In comparison with alternative methods
Tight tolerances, good surface finish
Handles very large diameters
Suitable for drilling of several linearly spaced holes requiring high axial tolerance
can often be performed on site with special tools
slow process