Question

In: Mechanical Engineering

A 3/4" diameter hole is to be drilled through 3/4" thick piece of steel plate. The...

A 3/4" diameter hole is to be drilled through 3/4" thick piece of steel plate. The twist drill is to be fed at 0.025 ipr. Maximum cutting speed of 70 fpm is recommended.

Calculate:

A) Cutting time

B) Metal Removal Rate (MRR)

Expert Solution

Given that,

Diameter of hole (D) = 3/4 in = 0.75 in

Thickness of plate (t) = 3/4 in = 0.75 in

feed rate is (f) = 0.025 inches per revolution

cutting seed (N) = 70 feet per minute = 357 rpm

A)

Cutting time is given by,

B)

$MRR = \frac{Volume}{T_{m}}$

samet mamat answered 2 years ago

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