Question

Data for plain milling operation are given below:
Length of work piece = 200 mm,
Cutter diameter = 10 mm, Number of teeth = 4
Cutter speed = 100 rpm,
Feed = 200 mm/min, Depth of cut = 2 mm,
Total clearance (entry and exit) = 5 min

Machining time for one single pass (in seconds) is

• A. 60
• B. 66
• C. 126
• D. 150

Answer 1

The correct option is B 66

$AP=\frac{1}{2}(D-\sqrt{D^2-b^2})$

$=\sqrt{d(D-d)}=14mm$
$=\sqrt{2(100-2)}=14mm$

$\text{Time/cut}=\frac{L}{f_m}=\frac{200+5+14}{200}\times 60$ $=65.7s\approx 66s$