Choosing a grease for a Bulgarian or the better lubricating the gearbox

Widespread among the amateurs got the angular grindingmachines( USM), called in the people by Bulgarians. With their help, the home master can not only perform grinding work, but also cut metal, plastic, stone. Angle grinders are manufactured by various manufacturers, including domestic ones.

The angle grinder is a reliable tool that can work with proper operation and timely replacement of grease, carbon brushes for a long time.

Properly selected lubricant for grinder not only prolongs tool life, but also improves performance.

Knowing the rules for choosing a lubricant for a grinder or preparing it yourself, you can perform maintenance without contacting the service department.

The main characteristics of the lubricant for the USM

In angle grinders, the main unit subjected to the greatest workload is a gearbox consisting of helical gears.

The rotational torque produced by the rotor of the grinder is transferred from the rotor to the working tool through the small helical gear to the large helical gear. Properly selected grease for the reducer significantly reduces the friction force, the heating temperature.

The grinder uses bearings, which also require periodic lubrication. This particularly applies to the spindle bearing of the large helical gear.

Such grease will fit, which meets not only the listed requirements, but also environmentally friendly.

Lubricants for an angle grinder must have certain characteristics and must have the required consistency in properties.

The lubricant for the gearbox of the ESM must have:

• with a viscosity of no more than 800 Pa · s;
• dropping point not less than + 120 ° C;
• with a strength of at least 120 Pa.

The grease for the ESM should not have mechanical impurities, be resistant to corrosion, firmly retained on the lubricating parts, do not melt at high temperatures, prevent the formation of scuffing at the points of contact of parts, and have water-repellent properties.

In a corner grinder of any firm, two types of plain bearings are used: bearings for the electric motor and bearing bearings for the gearbox.

The selection of the lubricant for the bearings of the motor is different from the selection of the lubricant for the gearbox bearing. It's all about different working conditions.

Lubricants recommended by foreign tool manufacturers

Foreign tool manufacturers, including USM, recommend specially formulated ointments as lubricants for Bulgarians.

One of the most common foreign lubricants is a lubricant bearing the MoS2 NLGI 2 ISOL-XBCHB 2 DIN 51825-KPF 2 K-20.

Let us decipher the marking:

• MoS2 - indicates the filler material, in this case molybdenum;
• NLGI2 - indicates the second viscosity class;
• ISOL-XBCHB 2 - affiliation with ISO standards;
• DIN 51825-KPF 2 K-20 - the grease is made according to German DIN standards;
• Numbers 51825 mean that the grease is of type K.

Lubricants produced with these characteristics are quite expensive. On the Russian market there are imported, less expensive lubricants.

Each tool manufacturer, be it Bosch, Makita, Hitachi, DeWalt, Metabo, RedVerg, Interskol, E256, LEPSE recommends its lubricants. This is the policy of the manufacturer. They insist that the lubricants that are specified in the instructions are used in the maintenance. Moreover, non-observance of these recommendations does not allow performing warranty repairs.

The grease for the Makita reducer is made in tubes. Its high cost is commensurate with high quality and long working life.

Lubricants of domestic manufacturers for bearings and reducers of bulldogs

With the growth of prices for foreign lubricants, lubricants of domestic producers are in high demand.

Russian lubricant manufacturers have learned to produce high quality lubricants suitable for any tools.

Lubricants for reducers of grinders, drills, drills have been developed.

Nanotech Metal Plak Electra products are very popular. A range of lubricants produced by this company allows you to select the lubricant

needed for each unit. Bearing grease ASM11

The angular grinder machine is equipped with three bearings. Two bearings are mounted on the rotor of the tool, one bearing is mounted on the shaft of the driven helical gear of a larger diameter.

Bearings already filled with lubricant are used in the UWB.But from improper operation, overheating of the tool, grease follows.

How to choose the correct lubricant for bearings of a Bulgarian?

Bearing grease must meet the following requirements:

• increase sliding;
• to reduce friction between component parts;
• evenly distribute heat and act as a coolant;
• to prevent the occurrence of corrosion;
• protect from ingress of dirt and dust;
• operate in the required temperature range up to + 150 ° C;

The operating conditions of the motor bearings are cast from the operating conditions of the gearbox bearing not only because of the temperature requirements, but also the operating modes, load conditions, frequency and speed of rotation.

Lubricant for motor bearings must have protective properties that prevent dirt, dust, moisture from getting on the bearing parts.

The Russian market has a wide range of foreign lubricants designed for bearings operating under different conditions. But their cost makes it necessary to look for cheaper domestic lubricants that are not inferior in quality.

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We recommend you pay attention to lubricants Tsiatim-221, VNIINP-246( GOST 18852-73), VNIINP-235 from domestic lubricants.

lithium greases are well proven.

With their high water-repellent properties, they have a wide temperature range. The role of the thickener in them is performed by organic and inorganic substances. For closed bearings it is best to use lubricants TsIATIM-203, VNIINP-242.

From pigment greases for bearings of the electric motor, the blue lubricant VNIIMP-246 and the dark purple ointment VNIINP-235 were distributed. The first grease due to the high price is less common than the second.

In today's Russian market, domestic manufacturers of lubricants are represented widely.

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Lubricant for the gearbox of the USM

The grease for the Bulgarian reducer differs from the bearing lubricant by its main feature, high adhesion. It should firmly hold on the teeth of the gearbox with a large rotation.

In general, the lubrication process of the gearbox in angle grinders is due to the small spraying of the lubricant and its slurries. The reducer works as if in an oil mist. Therefore, the lubrication requirements for gearboxes are slightly different.

In addition to increased adhesion, grease for gearboxes must have high thermal stability and do not relax at elevated temperatures.

Grease for the gearbox of the grinder with your own hands

The given lubricants of domestic production, although available at a price, but not always at hand.

Is it possible to create a grease for the gearbox of an angle grinder with your own hands?

And this question has an affirmative answer.

As the main technical characteristics of lubricants for the gearboxes of the USM are presented above, they can be used as a basis for the lubrication of the required characteristics by hand.

The basis of homemade grease for gearboxes should be a grease that has high adhesion. It should hold tightly on the parts in contact.

Grease for the CV joints has increased adhesion. SHRUS, this is a hinge in a front-wheel drive car, working in conditions of increased pollution, shock loads, temperature fluctuations and humidity.

Using the lubricant for the CV joints as a basis, it is necessary to add liquid lubricant( MC-20) to give the mass the desired consistency. MS-20 oil should be delivered drop by drop, thoroughly mixing the mass with a homemade mixer.

Good results are achieved by a mixture of a mixture of Ciatim-221 and TAD-17, where the basis is Tsiatim.

The correct process of lubricating grease in the angle grinders

The lubricant packing in the angular grinder units has its own rules. You need to know not only the order of its application, but how much and where to put it.

When changing the grease in the Bulgarian

The lubricant on the Bulgarian changes according to the maintenance plan for the tool, when replacing the failed gearbox components or the rotor bearings.

The old grease has a dirty dark color. This is due to the ingress of foreign particles of metal or dust into it.

How to remove the old grease correctly in the Bulgarian

The old grease is always removed completely regardless of its color. On the parts there should be no traces of the old grease, and in the cavities of the body of the particles of the destroyed parts.

To remove the old lubricant, you can use various washing fluids used by motorists to clean the engine and its parts. At home, it is recommended to use kerosene or a solution of kerosene and gasoline.

All parts and their cavities must be thoroughly washed and dried.

Greasing procedure for the

grinder reducer. The new grease is thoroughly mixed and applied in a thin layer before application. In bearings, the grease is applied by packing. If the lubricant is in a plastic tube, the neck of the tube is attached to the side bearing separator and squeezed out until it emerges from the back side.

How much lubricant should be used when replacing the

in the gearbox If the amount of grease in the bearings is controlled by flowing it from the back, a certain amount of lubricant is stuffed into the gearbox of the USM.Excess grease will flow out during operation. A small number of it will not ensure the quality work of the reducer.

In the gearbox, it is necessary to leave as much lubricant as possible so that the teeth of the gears are covered.

For a reference, apply so much lubricant that it occupies slightly less than half the volume of the reducer cavity.

Control of the correctness of lubrication in the gearbox ASM11

Control of the volume of lubricant stuffed in the gearbox is done by trial switching on the assembled grinder for a short time at idle.

If the gearbox starts to warm, there are signs of leakage from the oil seals and gaskets, then the conclusion is clear. You have shifted the grease. Open the gear housing and remove any excess grease. All excess lubricant will be placed on the covers of the gearbox housing. Insufficient amount of lubricant in the gearbox is determined by increased noise of the gearbox.

With prolonged operation of the ESM, the lubricant in the gearbox is distributed on the walls of the housing and from the external action it loses its properties.

After opening the cover of the gearbox, carefully inspect the condition of the grease, the tooth profile of the gears. If you know how, check the contact pin of the gears.

The presence of particles of dry or dried grease in the area of ​​the gearbox or on the housing indicates that the time for changing lubricant has come.

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