Given a 10 mm twist drill and a recommended feed of 0.15 mm/rev, what is the total feed after 20 revolutions?
3.00 millimeters
Feed on a drill is defined as the distance the drill advances into the work for every one revolution of the spindle, here given as 0.15 mm/rev.
Because the drill sinks the same amount each revolution, the total depth reached is simply the feed per revolution multiplied by the number of revolutions.
Substituting the values gives \(0.15\ \text{mm/rev}\times 20\ \text{rev}=3.00\ \text{mm}\).
So after 20 revolutions the drill has advanced a total of 3.00 mm into the job.
The 10 mm drill diameter is extra information; diameter affects cutting speed and torque but plays no part in the total-feed calculation.
The other figures come from wrong operations, for example halving or misreading the feed, so only the direct product 0.15 × 20 is correct.
Hence, the answer is 3.00 millimeters.
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