The segment of grinding machines in the construction market is represented quite widely and there will always be an optimal solution for each task. The most popular are high-performance units that work with solid-state bases, covering large areas. But for spot processing, this option will not work. In hard-to-reach places, compact devices manifest themselves well, which include a delta grinder with a triangular processing sole.
Design features and principle of operation
The device represents a group of vibration grinders, but it has a number of fundamental differences from standard models of this type. The main one is a triangular platform with an abrasive coating. This is a small working base, on which the electric drive acts, as a result of which reciprocating movements are made. On average, a wood delta grinder provides sole travel in the range of 2-3 mm. Drive power is usually modest, so this tool is rarely used in the processing of harder materials. As for nozzles, triangular abrasive sheets are attached to the platform with the help of Velcro. The coating material can be different - from fine-grained soft felt to the likeness of sandpaper.
Tool Specifications
The following parameters are considered in the choice of a delta sander:
- Power. It has already been noted that the power potential of the electric motor is small - from 100 to 300 W on average. For easy stripping, 100-155 W will be enough, but if regular adjustments to workpieces with shape modeling elements are planned, it is better to immediately turn to productive devices with a capacity of 300 watts or more.
- Oscillation frequency. Also an important characteristic of the delta grinder, which determines the intensity of the mechanical impact. So, for soft wood species, 6000-8000 counts / min will be enough, but if the task is to abrasively treat painted metal surfaces, for example, it is better to select models with a vibration moment of at least 15,000 counts / min.
- Sizes and weight. Of fundamental importance is the size of the sole with an abrasive pad. The smallest format is 90 x 90 x 90 mm, and the largest is approximately 140 x 140 x 80 mm. As for the mass, it usually fits in 1 kg.
Model Bosch PSM 100 A
The entry-level device from a well-known manufacturer of construction tools. The model received a modest electric drive at 100 watts, but the oscillation frequency of 26,000 counts / min compensates for the low power. The device is ideal for working in hard-to-reach places, if you need to make a careful correction of the surface with a vibration pitch of up to 1.4 mm. Despite the low performance indicators, the Bosch delta grinder in this version is quite functional. What does an integrated dust collector with microfiltration cost, thanks to which the workplace remains unpolluted.
180 Dexter Model
As the name implies, the device has a higher power potential, but otherwise the model turned out to be optimized both in terms of functionality and design. With a mass of 1.3 kg and a standard abrasive blade size of 95 x 136 mm, the device provides an oscillation speed of 12,000 cpm. What is very important, there is no possibility of adjustment, so you should not count on the versatility of processing. Also, reviews about the Dexter 180 W delta sander emphasize the unreliability of the Velcro sticking the abrasive to the sole. The problem is solved by fixing to the “Moment” glue, but taking into account constant fluctuations during operation for a long period of operation in this mode, you also won’t have to count.
Metabo DsE 300 Intec
If the previous cars represented the entry-level household segment, then this time we will talk about a serious competitor of a professional level. Moreover, the manufacturer Metabo is as much respected in the market for power tools as Bosch. Therefore, in terms of the quality of the element base, the models are almost identical. The difference is in performance and functionality. So, reviews of the DsE 300 Intec delta grinder include a 300-watt engine, an adjustable frequency range within the range of 14,000-22,000 kol / min, and the ability to turn the abrasive platform 360 degrees. But it should be borne in mind that the device has a small processing area and an average stroke size of 1.8 mm.
User's manual
Before starting work, the condition of the device, the integrity of the structure, the soles for the abrasive, etc. are checked. Particular attention is paid to the electrical part - from wiring to the circuit breaker, which will protect the device from overvoltage. If the delta grinder is provided with a dust extraction, then the abrasive sheet should be positioned so that the technological ventilation ducts along which the waste is sucked coincide with its holes. Directly during processing, the machine should be controlled in a circular motion, not strongly pressing the case to the surface. Manipulations should be soft and smooth, but sufficient for machining. After work, the device turns off, then the plug is removed from the outlet and you can begin to disassemble the structure for cleaning.
Service instruction
Both before and after working activities, the functional elements and surfaces of the tool should be cleaned. In particular, dust collector cartridges (if any), the area of the platform with an abrasive and the exhaust vents on the housing should be subjected to such care. Hard-to-reach areas of the delta grinder are cleaned with a fine brush, but without strong detergents. From time to time, the working parts of the device, which are most susceptible to wear, are updated. For example, this concerns a sanding plate. To replace it, it is necessary to unscrew the fixing bolts, remove its platform, and then in the reverse order attach the sole of the same format.
Conclusion
Due to the relatively low productivity, the tool in question is rarely used in large-scale grinding and grinding operations. But, its design is simply indispensable if processing of workpieces or surfaces of complex shape is required. For example, in carpentry workshops there is always a delta grinder for wood. How to choose a model for an ordinary home master? For minor repairs, simple devices are suitable without claims to the latest technologies and functionality. To clean the surface from paint, to correct the chamfers and edges of the wooden cladding - all this will be done by a model with a power of up to 100 watts. But if emphasis is placed on regular operations with the decoration of decorative surfaces or the processing of small parts, it is better to turn to efficient machines with electronic control and the presence of a dust extraction system.