Power Tool Buying Guide for Rotary Hammer / Hammer Drill

Hammer Drill Rotary Hammer

I grouped the Hammer Drill with the Rotary Drill because even though they are different, they are pretty much the same. A Hammer Drill can rotate and move back and forth while it drills which allows it to bore into concrete without burning the bit. A Rotary Hammer Drill works on the same principle, but is much more powerful than a Hammer Drill. A Rotary Hammer usually has a chisel feature, which allows the user to do light chiseling. A Rotary Hammer usually has its own special bit designed for the chuck of the Rotary Hammer Drill which prevents slipping.

Features

Variable Speed Selection - Allows the user to adjust speeds on the drill. High speeds are used for small holes while slow speeds are used for large holes.
Reverse - Allows the user to back a bit out of the hole since they tend to get stuck easily.
Depth Rod - A devise mounted on the side of the drill that lets the user know when they have reached the desired depth.
Side Handle - Allows the user to use an additional hand to hold the tool while drilling which gives better control. Most can be removed in case you are in a tight spot.

Drive Systems

SDS (Slotted Drive System) - At the end of these bits there are slots that match to the inside of the chuck on the drill. This holds the bit tight and will not slip, such as a normal chuck can do under such pressures. It also enhances the hammering action. SDS bits are harder to find and tend to be more expensive than regular drill bits.
SDS Max - These are the same as the SDS bits but have a larger shank. SDS Max bits are used for larger applications. Again these bits are a little more expensive, but worth it in the long run.

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