Determine the cutting time in cutting a 130 mm long keyway using HSS end mill of 20 mm diameter, having 5 cutting teeth. The depth of keyway is to be 4.5 mm. Feed per tooth is 0.15 mm and cutting speed is 95 m/min.

3.6 sec

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7.4 sec

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8.3 sec

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10.5 sec

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Solution

The correct option is B 7.4 sec
Cutting speed, $ν = \frac{π D N}{1000}$

$95 = \frac{π \times 10 \times N}{1000}$

$N = 1511.9719 r p m$

Feed per min = Feed per toot $\times$ No. of teeth $\times$ rpm

$= 0.15 \times 5 \times 1511.9719 = 1133.97897 m m / m i n$

Approach distance $A (D) = \frac{D}{2} = \frac{20}{2} = 10 m m$

$L = 130 + 10 = 140 m m$

$Cutting time = \frac{140}{1133.97897} = 0.12345 min$

$= 7.40 sec$

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Determine the cutting time in cutting a 130 mm long keyway using HSS end mill of 20 mm diameter, having 5 cutting teeth. The depth of keyway is to be 4.5 mm. Feed per tooth is 0.15 mm and cutting speed is 95 m/min.

The correct option is B 7.4 sec Cutting speed, ν=πDN1000 95=π×10×N1000 N=1511.9719rpm Feed per min = Feed per toot × No. of teeth × rpm =0.15×5×1511.9719=1133.97897mm/min Approach distance A(D)=D2=202=10mm L=130+10=140mm Cutting time =1401133.97897=0.12345 min =7.40 sec