Choosing the right drill
The drill is an essential tool for any handyman. As the name suggests it is used to drill holes in many materials. There are a multitude of models ranging from cordless drills to punches. Your choice must be made according to your needs, with each use his drill!
Drills for everyday use
To drill a few holes in a wall or tackle soft materials, a drill without percussion with a power of less than 500 watts is sufficient. For work requiring precision, it is best to choose a drill with high speed. The variable speed drive is particularly important, thanks to it, drills adapt to different types of materials; fast speed for wood and other soft materials, slower for concrete and metals.
The adjustment of the torque, therefore of the speed, is a criterion not to be neglected because it makes it possible to make small screwings and to work without problem on friable materials.
To drill resistant materials such as stone or concrete requires a powerful percussion drill, greater than 500 watts. For masonry and structural work, the ideal is the electro-pneumatic perforator that overcomes the strongest walls. The perforator is a big percussion drill.
Two types of mandrels exist according to drills, keyed chucks, and "self-tightening" chucks also called "automatic" in some manufacturers. They are used to fix drill bits and drills. Easier to use it is preferable to favor the self-tightening chucks.
With or without wire?
Cordless drills, attractive at first sight by their mobility are losing the level of value for money compared to corded drills. Less solid and less effective they have a very good grip. Batteries are a fundamental part of cordless drills. Three models are available on the market, NiMH which offer a high yield, NiCD less efficient but with a longer life and lastly lithium batteries, which are the most efficient and seem to be the best solution.
The drill driver
The reversible function that reverses the direction of rotation of a normal impact drill can be a good substitute for expensive screwdrivers.