Cordless sanders: features and model comparison

Cordless grinders are a type of portable equipment that allows you to significantly expand the range of use of grinders. As a rule, such models are compact, have a modern design and are suitable for cutting metal, wood, stone to a shallow depth.

The basic characteristics of battery-powered grinders are quite standard, they allow even with a small analysis of the market for such equipment to get an idea of ​​the requirements for the purchased tool. Among the important parameters, it is worth highlighting a number of characteristics.

• Supported disc diameter. As a rule, it varies in the range of 115-125 mm.
• Battery life. The most effective are lithium-ion versions for 18 V with a resource reserve of 5000-5500 A * h.
• The number of spindle revolutions per minute. The lower it is, the more intensively consumables are spent, the stock of circles will have to be regularly replenished. The optimal figure is not less than 8,000 rpm - for battery technology, the figure is quite impressive.
• Motor construction type. Brushless angle grinders are more expensive, but in the long term they turn out to be a more profitable purchase. Collector (with brushes) are simpler in design, they often fail.

In addition to other parameters, when selecting battery technology, it is worth clarifying the possibilities for its operation in a different range of atmospheric temperatures and climatic conditions.

All cordless grinders can be roughly divided into household and professional options. The first ones have ultra-compact dimensions and a quite expected set of characteristics: 3 Ah batteries, supported disk sizes up to 115 mm and light weight - on average about 1.5 kg. The budgetary cost makes such mini-angle grinders optimal for home use. But in terms of the duration of work without recharging, they are significantly inferior to their counterparts. On average, the tool lasts 10 minutes of continuous grinding or cutting. The immersion depth in the material does not exceed 25-28 mm.

Professional models also outperform their full-size wired counterparts in terms of supported drives - it reaches 125 mm versus 180/230 mm for large grinders. But otherwise, mobile devices have many advantages that allow you to fully control the entire process, to work without interruption for 30-45 minutes, depending on the type of operation being performed. Among professional models, highly specialized options are common. They are focused exclusively on metal cutting and are equipped with special impulse batteries.

Battery-powered angle grinder has a number of advantages and disadvantages. Its advantages include:

• high mobility - can be used where there is no access to the network at all;
• minimum weight - the lightest models weigh from 1.5 kg, without creating a significant load on the hand during work;
• low noise level - in comparison with network models, the difference is very noticeable;
• the comfort associated with the lack of wires and restrictions on movement on the site;
• the most simple design, which even a non-professional can cope with the start-up and debugging.

It is not difficult to make a rating of cordless angle grinders on the market. Making a comparison, it can be noted that there is a significant difference between professional and household appliances. There are several popular models among the market leaders.

• Metabo WB LTX BL 125 Quick equipped with a brushless motor, modern electronics to ensure safe operation, charging indicators. The innovative LiHD battery holds a charge for a long time, being considered one of the best on the market, and has a swivel design. At the same time, 9000 rpm at idle speed is sufficient to demonstrate high performance.

• Milwaukee M18 CAG125XPDB-0 features a brushless motor, professional grade and modern filling. Batteries are usually offered to be purchased separately - the manufacturer claims a capacity of 5 A * h. Among the advantages, one can note the presence of a filter, a quick-clamping nut for changing equipment, and the presence of an additional handle in the configuration.
• DeWALT DCG 412 M2 equipped with a protective bracket, a 4 A * h battery, during operation it develops up to 7000 rpm at idle speed. The model has an additional two-position handle, there is a start button lock.

As for straight machines for wood, here, when performing work, it is not the number of revolutions of the spindle that is of primary importance, but the ability of the equipment to cope with the tasks assigned to it. Straight angle grinder is intended for finishing the surface to the desired smoothness. Among its differences is the special shape of the body, reminiscent of the classic brace. The equipment is fastened in front, in a special socket, the range of possibilities depends on the status of the model - domestic or professional.

Cordless straight angle grinders for woodworking have a power of up to 800 W, while coping with the basic set of operations. For long-term sanding on large areas, it is better to choose a more powerful professional technique of 2000 W, which supports work with discs with a diameter of up to 150 mm. For precise processing of the material, small equipment will also be needed, the wider the choice of possibilities, the easier it will be to achieve the desired goal. Among the leading brands here are Metabo, Makita, Bosch.

In the next video, you will find an overview of the Makita BGD801Z cordless straight grinder.