Nthawi zambiri pamakhala mitundu itatu ya ma PDC (polycrystalline diamond compact) ma bearings: thrust bear, radial bear, ndi kuphatikiza kuphatikiza. Kunyamula PDC ndikofunikira m'malo ovuta, omwe amagwiritsidwa ntchito pobowola ma turbo, ma motors amatope, mapampu amagetsi amagetsi, RSS (rotary steerable system), magwiridwe antchito amafuta, ndi zina zambiri.
