Abstract: A drill bit for cutting a hole in a formation can have a longitudinal axis extending along a center of the drill bit. The drill bit can comprise a crown comprising at least one crown portion having a cutting face. A plurality of wear-resistant members can be embedded in the crown of the drill bit, wherein at least one wear-resistant member of the plurality of wear-resistant members extends to within 0.1 inches of the cutting face of the at least one crown portion.

Abstract: A stacked lamination endplate for a rotor that includes a number of adjacent laminations, stacked one on top of another, wherein each lamination has an identical shape, the shape having a central region, symmetric about a center axis, and a number of spokes, each spoke emanating radially outward from the central region, where each spoke includes a through-hole at its distal end, and wherein the laminations are stacked one on top of another and aligned, enabling, for each spoke, a bolt to be inserted through a corresponding through-hole of each lamination.