Question

If the number of double strokes per minute in a shaper is calculated by ($0.643\times$cutting speed in mm/min)/length of the stroke in m. Then the return speed is faster than the cutting speed by

• A. $40$%
• B. $60$%
• C. $80$%
• D. $100$%

Answer 1

The correct option is C $80$%

$\frac{1}{1+\lambda }=0.643$
$\lambda =0.555$
$\frac{V_f}{V_r}=0.555$
$V_r=\frac{V_f}{0.555}=1.8V_f$
Hence option (c) = 80% is correct