A cylinder of 155 mm diameter is to be reduced to 150 mm

Home » Materials Science and Manufacturing Engineering » Materials Science and Manufacturing Engineering Miscellaneous » Question

A cylinder of 155 mm diameter is to be reduced to 150 mm diameter In one turning cut with a feed of 0.15 mm/rev and a cutting speed of 150 m/min on a NC lathe. What are the programmed feed rate and the material removal rate.

1. 6250mm³/ min.
2. 56250mm³/ min.
3. 562mm³/ min.
4. None of these

Correct Option: B

V = ωr = 2Nr.
= πdN {2r = d, ω = 2πN}

So, N =	V	⇒ N =	150 × 10³	= 308 rpm.
	πd		π × 155

Programmed feed rate
= f × N = 0.15 × 308 = 46.2 mm/rpm

= f × V ×	(D₂ − D₁)	= 0.15 × 150 × 10³ × 2.5
	2

= 56250mm³/ min.