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.
- 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.
- 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.