Question

A hole is being drilled in a 20 mm thick block of magnesium alloy with a 15 mm drill with a point angle of 118ᵒ at a feed of 0.1 mm/rev. The spindle is running at 500rpm. Calculate the material removal rate, and estimate the time to drill the through hole.

Answer 1

The material removal rate (MRR) for a 15 mm diameter drill at 0.1 mm/rev feed and 500 rpm is calculated, and the time required to drill through a 20 mm thick block of magnesium alloy is estimated using known formulas.

Step-by-step explanation:

The material removal rate (MRR) during the drilling process can be calculated using the formula MRR = π × (d/2)^2 × f × N, where d is the diameter of the drill, f is the feed per revolution, and N is the spindle speed in revolutions per minute (rpm). For a 15 mm diameter drill, 0.1 mm/rev feed, and 500 rpm spindle speed, the MRR is π × (15/2)^2 × 0.1 × 500 mm³/min. To estimate the time to drill the through hole in a 20 mm thick magnesium alloy, we can use the formula time = thickness / (feed × N), which gives us 20 / (0.1 × 500) minutes.