It is a question of mining engineering, it is a calculation about drilling techniques.

In a mining operation, a diesel rotary drill rig will be used. The hard limestone

formation having compressive strength of $120$MPa will be drilled, with diameter

of $6-$inch tricone bits. The purchase price of the drilling machine is $12$ million

Turkish Lira $($TL$).$

Calculate the followings:

Feed force on the bit,

Drill$-$collar weight that must be connected in drill string,

Rotary power $($HP$)($Hard: Comp. strength $=120$MPa, Constant $\{$:$(K)={7\mathrm{.}10}^{-5}),$

Penetration rate and average penetration rate,

Calculate the depreciation cost $($TL$/$hour$)$ and maintenance cost $($TL$/$hour$)$ for

this drilling machine.