Roller Cone Bit or Reamer

A bit or reamer in which the teeth rotate on separate, internal shafts that are usually aligned perpendicular to line. Used for boring rock.

Roof Leader

A drain or pipe that conducts storm water from the roof of a structure downward and thence into a sever for removal from the property, or onto the ground for runoff or seepage disposal.

Rotary Rod Machine

A machine used to drill earth horizontally by means of a cutting head attached to a rotating rod (not an auger). Such drilling may include fluid injected to the cutting head through a hollow rod.

Rotation Controls

Those controls that control the direction and/or the rotation of the tool.