Utilized while blast hole drilling with downhole hammers. A splined joint of the shank improves reliability and joint strength and provides quick and easy tool change.
Applied for rotary drilling in strata with soft to soft/medium characteristics (f=1-5 in terms of professor M. M. Protodyakonov rock hardness scale) with air or air-water flushing. They are especially effective both for overburden drilling and coal exploration. VBM drag bit comprises three parts: a bit body, removable teeth and a back flow valve.
Applied for construction and mining industries and can be successfully used for exploration drilling, methane drainage borehole drilling and injection drilling. FDC bits comprises a steel body and polycrystalline diamond cutters (PDC), they are used for drilling both vertical and directional fullhole wells. Application of wear-resistant PDC cutters multiplies bit life and performance. Flushing through ports directed towards the well bottom efficiently cleans the hole and cools the bit.