stay in the marina.
The Naval term for a submarine's initial rise above the surface of the water is called "broaching", e.g., a submarine has broached the surface. It takes more effort to fully surface a boat to where it's buoyant enough to stay on the surface. Broaching can be done intentionally or unintentionally by nature. If a boat is at periscope depth (about 65' for most boats), and sea swells are large, a big enough wave can suck a boat right to the surface without warning.
Surfacing or broaching.
A process of putting rifling in a barrel.
Part of the manufacturing process for the barrel.
The word broaching has to do with metal working. The inclusive definition and meaning can be somewhat on the complicated side unless you have a well - rounded working knowledge of tools and die parts. A broach is a tool with teeth and it clears away material. So broaching is the use of this tool. It is used in work where accuracy and exact precision is required.
Rotary broaching tools are used to precision cut internal polygon forms. This method is becoming very popular and has made appearances in the medical, automotive, aerospace, and plumbing fields.
Neither the tool or the workpiece rotate
A broaching tool - or a reciprocating machining process such as a shaper, see the link in the resources below.
Roger Owen Smith has written: 'The broaching process applied to four common metals'
General machining processes include turning, shaping, milling, drilling, sawing, abrasive machining, and broaching.
Rotary Broaching is a method of producing both internal and external forms fast and accurately on the end of a workpiece. Rotary broaching makes it possible to very accurate forms within 0.0005 inches within seconds. With rotary broaching not only can you produce standard shapes such as hexagons and squares but also shapes such as Double Hex Rotary Broaches, 6-Lobe Rotary Broaches, Serration Rotary Broaches, J500 Rotary Broaches, Spline Rotary Broaches, Involute Rotary Broaches, Torx Rotary Broaches, Double D Rotary Broaches and any other Special Design Required. Rotary broaches can be made to just about any size, English or Metric. Some of the material that can be rotary broached is brass, aluminum and steel and can go as much as 2 inches deep.