Cordless drill at a right angle.
If you want to choose the best cordless right angle drill, read this guide.
The operating parameters of the screwdriver determine the scope of its use. Tools are divided into household and professional. The latter are equipped with powerful batteries to work for a long time without recharging. Of course, they are also worth a lot. Households are designed for periodic use with modest performance. Your choice depends on your needs, and our task is to talk about what modern manufacturers offer. Let’s start with the main thing.
1.1. Key parameters: torque and rotation speed
The torque value starts from 5 Nm and exceeds 200 Nm. Household models are characterized by 8 – 20 Nm. Professional values start at 100 – 130 Nm. This is a fundamental parameter of choice, since it shows the moment of force that makes the spindle shaft rotate, and determines the choice of material to be drilled, as well as the diameter and length of the fastener. For example, a household tool with a size of 18 Nm can be screwed into dry wood with 6×70 mm screws, and a professional tool with a torque of 165 Nm can work with 22×125 mm fasteners. The tool torque is adjustable. With the help of a limiter – a ring, the necessary force is set on the body, and as a result, the connection is reliably carried out, the integrity of the fasteners and material is maintained.
But the rotation speed shows the number of spindle revolutions with a fixed nozzle per unit time. If you work with fasteners, this parameter is set to 500 rpm, for example, if you install the hinges on the kitchen cabinet or fasten the drywall sheet on the profile. If holes are drilled, it exceeds 1000 rpm. The rotation speed in most models is also adjustable. To drill more accurately, without jumping off the drill, you can choose one of several speed modes – there can be 2, 3, 4. Adjusting the rotation speed optimizes the force when working with tooling of different sizes and materials of different density and structure.
1.2. Battery Type, Capacity and Voltage
How to choose a cordless drill driver by type of battery?
What does battery capacity mean?
Nickel-cadmium (NiCd) batteries are characterized by a large number of charging cycles and stable operation in different temperature conditions. However, to provide the required capacity, they are produced in rather large sizes, which is not always convenient for a mobile tool. They have a pronounced memory effect, and it is recommended to store them only in a completely discharged state, and charge them only after a complete discharge. But they still remain a relevant option for a cordless tool and make it cheaper. Nickel-metal hydride (NiMH) batteries are lightweight and environmentally friendly. Able to work for a long time without recharging, and this should be considered when choosing a tool. However, batteries do not like frost, and even at a temperature of 2 – 5 degrees above zero they can self-discharge, so it is problematic to store them in the trunk of a car or garage. They have no memory effect and should be kept charged. Lithium-ion (Li-Ion) batteries can be charged at any time without waiting for a complete discharge. They are practically not subject to self-discharge, but are sensitive to cold. They are characterized by high performance with minimal weight – their energy consumption is almost 4 times higher than that of other types of batteries. Read about the features of choosing a tool for this parameter in the article “What kind of battery is needed for a screwdriver?”.
The duration of the tool’s life without recharging depends on this characteristic. If you are thinking about how to choose a cordless screwdriver for your home, then you most likely do not need an expensive professional with a lithium-ion battery. If you intend to drill a couple of holes at home, you always have the opportunity to recharge the battery. The capacity of household tools, as a rule, is 1.5 – 2 A / h, and professional – from 2 A / h and above. In this matter, such a moment as the battery charging speed is also important. It can be from 3 to 12 hours. It is usually a household and quite budgetary tool. For professional models, the charging speed indicator can be equal to 1 hour or even 0.5 hour. But they will cost much more.
What is the effect of battery voltage?
It is generally accepted that the higher this characteristic, the greater the torque, i.e. tool power. But here it is important to consider the following nuance. Models are presented in the range from 3 to 36 V. If we take two models with different voltages, for example, 14.4 and 18 V, we will see that they have one indicator of torque – 70 Nm. The difference between them is the number of elements that make up the battery. In the 18-volt model there are more of them, which means more battery capacity. This ultimately leads to the fact that the tool is more expensive. It is up to you to decide how fundamental this characteristic will be in the matter of choosing your instrument.
1.3. What else to look for?
The impact function is required only if you intend to drill hard materials such as concrete or brick, or to unscrew the fasteners with a knocked-down thread or a jammed head. That is, if you try the drill as a hammer drill. Otherwise, you simply overpay for this unclaimed function.
The reverse or reverse function is designed to unscrew the fasteners and pull out the drill stuck in the hole. It is important to check that when changing the direction of movement, the power remains unchanged.
The quick-detachable cartridge allows you to quickly change equipment without using a special key. It is enough to slightly press on it, and she herself will be fixed with a characteristic click. The manufacturer equips them with his tool in order to save user time.
Backlighting is a minor but often very useful feature. Agree, while working in a poorly lit place, it will matter.
The dimensions and ergonomics of the tool are no less important than the technical characteristics. Most models are a single unit with the battery – the pistol grip and the power supply are functionally and ergonomically arranged. Before buying, hold the tool in your hands and try on its dimensions and weight for your hand. It should be convenient for you, and this quality does not depend on what you are going to do – drill a hole once a year or assemble cabinet furniture every day.
Options can play a decisive role in the matter of how to choose a cordless drill / driver. It’s good when the tool comes with a second battery, a charger with fast and slow charging, a set of bits and drills. Convenient bag or case for storage and carrying.