Abstract: A system for modulating air flow in a gas turbine engine is provided. The system may include a seal wall comprising an opening, a seal door configured to slideably engage the seal wall, and an actuator configured to move the seal door over the opening. In various embodiments, the system may include a surface forward of the seal door. The seal door may be configured to seal a passage through the surface and the opening of the seal wall. A track may be disposed under the seal door. The track may comprise cobalt. Rollers may be coupled to the seal door with the rollers on the track. The seal door may comprise a nickel-chromium alloy. A sync ring may be coupled to the seal door. The actuator may be coupled through the sync ring to the seal door.

Abstract: An in situ method for extraction of arsenic contaminants from a soil medium and remediation of the medium including contacting the medium with an extractant solution, directing the solution within and through the medium, and collecting the solution and contaminants. The method can also be used for arsenate and/or arsenite removal.

Abstract: A rectangular insert of cutting material having top and bottom surfaces intersected by longitudinal edge surfaces to form four main longitudinal cutting edges. The top and bottom surfaces have ribs normal to the edge surfaces at each corner and sinusoidally spaced ribs normal to the edge surfaces starting at graduated distances from each corner rib so that when the inserts are stacked edgewise in different index positions, the corner ribs register with each other and the other ribs are out of phase with each other. The ribs of the cutting edges all extend edgewise of the bit or in the width direction so that the width of the insert is available to take the cutting thrust.

Abstract: A rotary cutter having serrated cutting edges formed by the intersection with a cutting face of serrations angularly inclined to the cutting face to provide side clearance for the trailing sides of the serrations.

Abstract: A drill having at least two indexable radially spaced inserts arranged with axially projecting cutting points to machine overlapping concentric grooves, the outermost insert machining a groove having an outside diameter equal to the diameter of the hole and the innermost insert machining a groove overlapping the center of the hole, and radial components of the cutting thrust on said inserts being in opposition and balancing each other. The cutting thrust may be balanced by the number, shape and/or the rake of the cutting edges.

Abstract: A milling cutter with an infinite adjustment for face run out of the cutting edges in which each cutting edge may be held within 1/10,000 of an inch or less of a common plane. For numerically controlled machines the common plane may be located a fixed distance from the back of the cutter body. Another feature is a positive stop on the wedge which guarantees that once adjusted each insert will remain in adjusted position.

Abstract: A stator press including a coil forming device and a coil former, the coil forming device having a plurality of blades arranged to be inserted into the slots of a prewound stator and moved radially outwardly, each blade being independently moved by a separate hydraulic piston and cylinder assembly, the hydraulic piston and cylinder assemblies being connected to a common source of hydraulic fluid for simultaneous movement, the radial movement of the blades seating the coils in the slots of the stator to make room for more coils. The coil forming device being supported on a press which includes a coil former to bend the loops of the coils outwardly away from the opening in the stator.