Page "hobbies" Paragraph 525
from
Brown Corpus
Feeds and speeds
Drill speeds are important if you want a good job.
Each cutting tool will operate best at a given speed, depending on the material worked.
On most drill presses, it is impossible to get the exact speed, but you can come close by adjusting the drive belt on the step-cone pulleys.
You will find a chart giving the various speed ratios available with your particular drill press somewhere in the instruction booklet that came with the tool.
See the table on page 34 for exact recommended speeds.
Generally, the larger the tool and the harder the material, the slower the speed.
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1.835 seconds.