Drill and manufacturing method thereof.

scraping bit for drilling subsurface formations comprising a bit body having a longitudinal axis, a drill bit gauge spaced substantially radially from the logitudinal axis and a face positioned to precede the scraping bit in the subterranean formation during drilling, and a plurality of knives oriented on the bit body, an inclination angle of each knife of said plurality of blades being a function of at least one of a radical distance from said knife with respect to the longitudinal axis and a position said vertical knife along the longitudinal axis, and method of making said drill bit.