V=(Pi x d)/(n x 1000)

V=(d x n)/(Pi x 1000)

V=(Pi x n)/(d x 1000)

V=(Pi x d x n)/(1000)

Bevel gear type-drilling machine

Breast type-drilling machine

Ratchet type-drilling machine

Pneumatic type-drilling machine

Rotation of drill at its axis

Rotation of work piece that being drilled

Rate of material removed by drilling

Distance travelled by a drill over the job in one minute

Amount of material the drill removes

Drill advances in one complete rotation

Total depth of the drilled hole

Width of the chip removed by drill

Mineral oil

Air

Soluble oil

Chemical or synthetic soluble oil