Hammer drill or rotary hammer drill?
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Hammer drill vs. rotary drill
Use a hammer drill for smaller jobs like anchoring bolts in walls. Use the rotary drill for bigger jobs like drilling holes through thick concrete foundations.
Need to drill a 1-in. hole through a concrete foundation? You can buy a 1-in. hammer drill bit with a 1/2-in. shank, but it won’t be long enough, and drill bit extensions aren’t designed to take abuse from
a hammer drill. Even if you
didn’t need an extension,
the 1-in. bit likely exceeds the rated capacity of your hammer
drill. As a rule, a heavy-duty 1/2-in. hammer drill is limited to a 3/4-in.
bit. Even if you could find a stepped down
shank that you
could chuck into your
drill, you’re better off
renting a rotary hammer
drill with the proper length bit. It’ll get the job
done in a fraction of the time and
with a lot less sweat.