Part 3:
A lathe is to have n spindle speeds arranged in arithmetic progression. It is to cater for work ranging from 25mm to 70mm diameter. Allowing for a cutting speed of C m/min, find these spindle speeds.
The formula for cutting speed is:
S=πDN/1000
Where:
D = diameter of work in mm N = spindle speed of lathe in rev/min S = cutting speed in m/min
A drill is to have n spindle speeds arranged in Geometric Progression. It is to drill a range of holes from 5mm to 15mm in diameter at a cutting speed of Cm/min. Find the spindle speeds (N)
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