Abstract: An energy dissipator for use in a sumped manhole includes a sheet member. The sheet member defines a downstream surface, an upstream surface opposite the downstream surface, and opposing side edges each extending between the downstream surface and the upstream surface. The sheet member includes a plurality of apertures. Each of the plurality of apertures extends through both the downstream surface and the upstream surface. The sheet member extends in an arcuate manner between the opposing side edges. The dissipator is configured to intercept fluid flow within the manhole to decrease energy and control flow dynamics within the manhole.

Abstract: A cup-shaped wheel having an abrasive rim is employed to edge grind the teeth of a circular saw to an improved contour. The grinding wheel is carried by a slide means which brings the grinding wheel into contact with the teeth of the circular saw. The slide means is also adapted to accomodate a drive motor for rotating the grinding wheel. An adjustble mechanism is incorporated into the slide means to adjust the angle of attack of the grinding wheel. In this manner the contour of the working surface generated can be varied at will. Since only point or edge contact takes place between the abrasive rim and the tooth, the wheel is essentially self-dressing. The method and apparatus are specifically adapted to grinding the carbide tip teeth of steel cutting saw blades. The relative movement of the machine elements is automatically controlled by a programmed electronic unit which, in turn, controls a system of hydraulic pistons.

Abstract: A cup-shaped grinding wheel having an abrasive inner rim is brought into grinding contact with a tooth of a circular saw. The angle of attack of the grinding wheel is such that it imparts a second surface to the face of the saw tooth. The second generated surface has a continuous curved contour and a more negative average rake angle than the remaining portion of the face of said tooth. The apparatus and method are especially adapted to grinding the carbide tipped teeth of steel cutting saws but this technique may be used on other saw blades. Movements of the machine elements are automatically governed by a programmed electronic unit which, in turn, controls a system of hydraulic pistons.