This is a portable drill. It has a cord you have to plug into an electrical supply. The voltages used depends on both the country supply and whether a "low voltage" isolation transformer is used a a safety measure.
Cordless models use their own internal batteries. When you can't bring the work to the drill, you can take the drill to the work. But don't expect it to put large holes through very hard metal, although they are very versatile they are limited to the amount of work they can do by their power rating. The biggest drill bit that'll fit in the chuck of these drills is usually marked on the body of the drill or chuck, along with the speeds at which it turns.
Many portable drills have two operating speeds but some portable drills have a variable speed rating that is determined by how much pressure is placed on the trigger and can be set to any speed within their range.
Drill bits come in many closely spaced sizes. The most common is the twist drill. It has a point, and a body, usually with two spiral grooves, and its shank is gripped in the jaws of the drill chuck. There are different types for the materials to be drilled.
A bench mounted drill allows accurate drilling with more control - more so than a portable drill, which although convenient, can be difficult to guide accurately. A mounted drill can feed the drill bit at a controlled rate, and the work table on the drill normally has a vice to secure the job at a constant angle to the drill bit. Also, this drill can be set to run at different drilling speeds. This drill chuck takes bits up to 13 millimeters or one half inch in diameter.
A Morse taper is a system for securing drills.
The morse taper size changes according to drill size. The shank of the drill bit is tapered and looks like the tang of a file. It fits snugly into the drill spindle which has a similar taper on it's inside. The tang on the drill bit is located in the spindle and it drives the drill. It's a quick way to change drills without constantly adjusting the chuck.
When there's already a hole drilled in sheet metal that needs enlarging, a multi-fluted tapered hole drill will do the job in about the same time it takes to say it.
A drilling speed chart should be kept near the bench or pedestal drill. It compares drill sizes and metals to show the proper speed. So, to drill a 10 millimeter or 2/5 of an inch hole through this piece of aluminum, the drill speed should be 1,800 revolutions per minute.
