Estimation of Machining Time in Boring Assignment Help

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Estimation of Machining Time in Boring

In boring operation the machining time is calculated the same manner as in turning. It is given by the following relation:

Equation 1

Machining Time = Depth of hole to be bored in mm minutes/ N × feed or rev

Where, N = No. of revolutions per min. of machine spindle or work.

Example

In cast iron housing a hole of 30 mm diameter is to be bored to a depth of 50 mm. Calculate the machining time required for boring this hole assuming a cutting speed of 30 mpm and a feed of 0.2 mm per revolution.

Solution

N = Vc × 1000/ π× D

= 30 × 1000/ π× 30

= 318 rpm

Machining time =50 / (318 × 2)

= (50 × 60 )/  (318 × 0.2) = 47 secs.

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