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if the feed per revolution on an upright drilling machine is set to 1/64" and the rpm is set to 105, how many revolutions are required for the drill to advance 2 1/8" into the part?

1 Answer

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Answer:

Proportion states that the two ratios or fractions are equal.

As per the given statement:

f the feed per revolution on an upright drilling machine is set to 1/64" and the rpm is set to 105.

Let x represents the revolutions are required for the drill to advance
2(1)/(8) into the part.

By definition of proportion:


((1)/(64) )/(105) = ((17)/(8) )/(x)

By cross multiply we have;


(x)/(64)= 105 \cdot  (17)/(8)

Multiply both sides by 64 we get;


x = 105 \cdot 17 \cdot 8

Simplify:


x = 14,280

Therefore, 14,280 rpm revolutions are required for the drill to advance
2(1)/(8) into the part

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