Question

A workpiece of $2000mm$ length and $300mm$ width was machined by a planning operation with the feed set at $0.3mm/stroke$. If the machine tool executes $10$ double strokes/min, the planning time for a single pass will be

• A. $50min$
• B. $100min$
• C. $200min$
• D. $220min$

Answer 1

The correct option is B $100min$

Given data:
Workpiece length, $l=2mm$
Width, $w=300mm$
Feed $=0.3\text{mm/stroke}$
Number of strokes required $\left(S_N\right)$
$=10\text{double strokes/min}$
$S_N=20\text{strokes/min}$
Total machining time
$=\frac{L}{S_N}=\frac{2000}{20\left(\frac{\text{strokes}}{min}\right)}=100\text{min}$