Skil DL181901 Manual Del Propietário página 14

Drilling Metal
There are two rules for drilling hard materials. First, the harder the material, the greater the
pressure you need to apply to the tool. Second, the harder the material, the slower the speed.
Here are some tips for drilling in metal:
Lubricate the tip of the bit occasionally with cutting oil, except when drilling soft metals such
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as aluminum, copper or cast iron.
If the hole to be drilled is fairly large, it's often faster in the long run to drill a smaller hole first,
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then enlarge it to the required size with a larger bit.
Maintain enough pressure to assure that the bit does not just spin in the hole. This will dull
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the bit and greatly shorten its life.
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