Trepanning °ø±¸

Trepanning is a method of producing large deep holes economically from solid. The process can also be used for boring tubing where heavy stock removal is needed. A specially designed hollow tool cuts a narrow circular path in the workpiece and leaves a solid core. Because all the material is not being removed, the rate of penetration by trepanning is much faster than other methods.
The cutting tools used are carbide, which means that all of the newer high strength machinable materials can also be trepanned.

The conventional method of producing a seamless tube by piercing and drawing is limited to walls lighter than one-third of the outside diameter and and inside diameter less then 12". The higher temperatures and pressures used in space age and missile components have brought about an increased need for heavier walled tubing, piping and pressure vessels. Trepanning greatly increase the sizes available and does not limit the designer to light walls and small I.D.s.
Trepanning produces holes which are accurate for size, superior in finish and concentric to the outside diameter.