What is the gear ratio of the gearbox of an angle grinder?. Gear lubrication of angle grinder: how to replace than lubricate and when to change

Grinder Repair With Your Own Hands

An angle grinder is an angle grinder (angle grinder) that requires careful handling. However, sometimes it fails and can not work properly. For quality repair of the angle grinder with your own hands it is necessary to get acquainted with the design features of the tool.

  • Anchor. this element is located in the electric motor. When you turn it on, it starts to rotate. The higher the speed, the more powerful the tool is.
  • The manifold is a separate armature element with power and control windings.
  • Electric brushes. are used to drive the current cable to the collector.
  • Gearbox. transmits mechanical energy to the disc.
  • Stator. it is a fragment of a motor and has the most complex design.

Important! Before you start repairing your angle grinder with your own hands, you need to prepare diagrams and instructions, depending on the model. This will help to get it right.

With what and how to grease?

During assembly, each part is lubricated with synthetic (semi-synthetic) or mineral paste (grease). These substances differ in viscosity and resistance. The smaller it is, the more often parts must be coated. After a gear unit has been disassembled, it is recommended that each component should be coated separately and gradually reassembled. Lubricant is applied with a brush and distributed over the entire surface of each part.

Another method is to use special gear oil. Oils are a watery mixture. They are used in the same way as the grease, or from time to time filled into the gearbox without disassembling it, if the construction of the electric screwdriver has a special hole.

Thus, having understood the structure of the gear unit of an electronic electric screwdriver, to remove it from the tool, check all the parts and, if necessary, change the lubrication will not be difficult even for the novice master. If you perform this operation often 1-2 times a year. the risk of electric screwdriver breakdown will be the least.

Safety and nuances in choosing

Before choosing a mechanical drill, special attention should be paid to the quality of manufacture of all visible parts, the smooth rotation of the chuck, the convenience of the handles. The body is free of burrs, sharp edges and edges, the gears inside the gear must rotate without extraneous noise.

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Mechanical simple hand drill requires no special skills when using. But there are safety requirements that are designed to minimize the possibility of injury to the operator and tool breakage.

  • Any workpiece to be drilled must be firmly secured. If it is held by hand, it can break loose and cause injury.
  • Do not touch the drill with your hands. friction causes it to become very hot, especially when drilling metal.
  • When drilling at high RPM, you must take breaks to allow the drill to cool or apply a cooling slurry.
  • Protect your hands with gloves and your eyes with goggles, because small drilling debris can cause injury, even though the speed is not as high.

The safety measures have been developed over the years based on the analysis of the accidents during the operation and take into account the most negative experiences.

The electric collector drill motor has three main elements. the stator, the armature and the carbon brushes. Stator is made of high magnetic permeability electrical steel. Has a cylindrical shape and grooves for laying the stator windings. There are two stator windings and they are facing each other. The stator is rigidly mounted in the body of the drill.

The rotor is a shaft onto which a core of electrical steel is pressed. Along the entire length of the core, grooves are ground, at regular intervals, for laying the anchor windings. The windings are wound with solid wire with taps for attachment to the collector plates. Thus, an armature is formed, divided into segments. The manifold is located on the shaft shank and is rigidly mounted on it. During operation, the rotor turns inside the stator on bearings located at the beginning and end of the shaft.

On the plates during the operation the spring loaded brushes move. By the way, when repairing the drill, special attention should be paid to them. The brushes are made of graphite and have a parallelepiped shape with embedded flexible electrodes.

Drill speed is controlled by a triac regulator in the trigger. It should be noted the simple adjustment scheme and small number of parts. This regulator is assembled in the pushbutton body on a substrate of textolite using microfilm technology. The board itself has tiny dimensions, so that it can be put in the housing of the trigger. The key point is that the drill regulator (triac) interrupts and closes the circuit in milliseconds. And the regulator does not change the voltage that comes from the socket in any way (but it changes the rms value of the voltage, which is shown by all voltmeters that measure AC voltage). precisely, it is a pulse-phase control. If the button is pressed lightly, the time when the circuit is closed is the shortest. As the button is pressed, the time when the circuit is closed increases. When the button is pressed to the limit, the time when the circuit is closed is the maximum or the circuit does not open at all.

scientifically it looks like this. The principle of operation of the regulator is based on the change in the momentum (phase) of triac closing in relation to the line voltage going through zero (the start of the positive or negative half-wave of the supply voltage).

To make it easier to understand how the regulator works, let’s make three time diagrams of voltages: line voltage, triac control electrode and load voltage. When the drill is plugged in, the regulator inputs an alternating voltage (upper diagram). At the same time a sinusoidal voltage is applied to the triac’s control electrode (medium voltage diagram). At the moment when its magnitude exceeds the switching voltage of the triac, the triac opens (circuit closes) and the mains current flows through the load. After the control voltage falls below the threshold voltage, the triac remains open because the load current exceeds the hold current. The moment the regulator input voltage reverses its polarity, the triac closes. The process then repeats. Thus, the voltage on the load will have the form as on the lower diagram.

The greater the amplitude of the control voltage, the earlier the triac will turn on, and therefore the longer the duration of the current pulse in the load will be. Conversely, the lower the amplitude of the control signal, the shorter the duration of the pulse. The amplitude of the control voltage is controlled by a variable resistor connected to the trigger of the drill. You can see from the diagram, that if you don’t phase shift the control voltage, the control range will be from 50 to 100%. Therefore, in order to extend the range, the control voltage is shifted in phase, and then in the processes of pulling the trigger the voltage at the regulator output will change as shown in the figure below.

Angle Grinders. 5 Common Issues & How to Fix Them

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The wiring diagram, and in particular the connection diagram of the drill button, may vary from model to model. The simplest diagram, and the best demonstrating the principle of operation, is as follows. One lead from the power cord is connected to the speed regulator.

gear, ratio, gearbox, angle, grinder

To avoid confusion, it’s important to understand that the speed regulator and the reversing control are two different parts that often have different housings.

The only wire coming out of the speed regulator is connected to the beginning of the first stator winding. If there were no reversing device, the end of the first winding would be connected to one of the rotor brushes and the second rotor brush would be connected to the beginning of the second stator winding. The end of the second stator winding leads to the second power cord wire. Here is the whole schematic.

A change in rotor direction occurs when the end of the first stator winding is connected to the second brush instead of the first, with the first brush connected to the beginning of the second stator winding.

In a reversing device, this is what happens, so the rotor brushes are connected to the stator windings through it. There may be a diagram on this device showing which wires are connected internally.


#1 igber.

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#5 Alexander.

#6 kutusov

Alexander (October 12, 2012. 10:15 am) wrote:

#9 Maximus.

igber (October 13, 2012. 18:18) wrote:

#10 Petrovich79.

igber (October 13, 2012. 18:18) wrote:

#12 igber.

Shapoval (October 13, 2012. 8:07 PM) wrote:

gear, ratio, gearbox, angle, grinder

Petrovich79 (October 13, 2012. 19:30) wrote:

#13 Petrovich79.

igber (October 13, 2012. 21:54) wrote:

Angle Grinder: 4 Mistakes to Avoid

#14 Alexander.

Petrovich79 (October 13, 2012. 22:01) wrote:

#15 Petrovich79.

Alexander (October 13, 2012. 22:05) wrote:

#17 Sergey parket.

Petrovich79 (October 13, 2012. 22:11) wrote:

#18 Petrovich79.

Sergey parket (October 14, 2012. 12:08 AM) wrote:

So it is only for the replacement of the gear pair. ))

gear, ratio, gearbox, angle, grinder

Alexander (14 October 2012. 09:38) wrote:

What are the reducers: straight, reduction, angle, and others

A mechanical gear unit is a mechanism which transmits the torque and the shaft speed required for operation of the drive unit from the motor system. Some types of gearboxes can change their direction of rotation.

gear, ratio, gearbox, angle, grinder

Gearboxes with coaxial (parallel) shafts are generally the most common with spur gears. They can have various gear ratios and number of conversion steps. Transmission is smooth, virtually loss-free, but they cannot change the direction of rotation of the shaft.

Angular gears, which are used in bolsters, are able to provide 90° direction of the shafts. Bevel gears can be either straight tooth or bevel. On some low-power household bolt cutters, such as Bosch models, a straight tooth gear is used, where there are no requirements for smooth running and noise level. Circular teeth have a higher load-bearing capacity, have less noise due to smooth engagement, and are less sensitive to assembly errors.

Depending on the value of the gear ratio, gears are divided into the following types.

  • Direct. The gear ratio is 1. Such a gearbox is used, for example, in some multi-shaft truck transmissions.
  • Increasing. Otherwise known as a multiplier, where the gear ratio is less than 1. The main purpose of the gearbox is to increase angular speed. The torque on the output shaft is reduced.
  • Reduction gearbox. This has a transmission ratio greater than 1. Most attachments, such as angle grinders, use this type of gearbox in a variety of applications.

There are a variety of reduction principles and designs. However, each mechanism is best suited to a particular type of. angle grinder without a bevel gear is already quite difficult to imagine.

How to Disassemble an Electric Screwdriver Button?

Depending on the cause of the fault, the electric screwdriver can be disassembled. There is no need to do unnecessary processes, otherwise you won’t get it all back.

Determine the gear ratio manually

Very often when customers contact our organization, they say that the failed reducer has no nameplate and they have no idea how to know the gear ratio of the reducer. This section of the site will be devoted to this question.

So, the calculation of the gear ratio of the spur gearbox consists of the following operations;

  • Count the number of teeth of each gear and pinion shaft of all the stages of the reducer;
  • divide the number of teeth of the gear by the number of teeth of the pinion shaft working in tandem with it;
  • If you do this operation for each stage you’ll get gear ratio for each stage;
  • Multiply these numbers by each other, and you will get the total gear ratio

Calculation of the worm gear ratio consists of the following steps:

  • count the number of teeth on the worm wheel
  • determine the number of turns of the worm (for example, a normal drill has two turns)
  • divide the number of teeth of the wheel by the number of worm starts and get the gear ratio of the worm gearbox
  • in case of a two-stage gearbox, do it for each stage and multiply by each other

As you can see, everything is simple enough. If the reducer still has at least some working capacity, it is enough to manually rotate the input shaft of the reducer to one full revolution of the output shaft. The number of revolutions of the input shaft and will be the gear ratio. In the same way you can determine the gear ratio of most of the reducers presented in our catalog.

How to compare the age of a cat and a man

Cat owners often try to relate the age of their pets to humans using the popular method of multiplying a cat’s age by seven. Thus, a one-year-old animal is a seven-year-old child, a two-year-old cat is a fourteen-year-old teenager, a three-year-old is a twenty-eight-year-old youngster. In practice such ratio cannot be called correct, for example, at the age of seven a human being cannot have offspring, while a one year old cat is quite capable of reproduction.

Scientists-felinologists offer other ways of counting, which change, depending on the age of the animal. So, a one-month old kitten is equal to a half-year old child and a two-month old kitten is equal to a one-year old child. At the age of one year, a cat’s physical and mental development is the same as that of a human at age 15. Such ratio seems to be quite reasonable: during the first year of life a cat learns to live independently: to get food, to look after itself, to protect itself, to get along with other people. Approximately the same thing a human does from birth to 15 years of age.

The period from two to eight years is the age of full bloom for a cat. It corresponds to 24-48 years of age in a man. This is the time of the greatest physical activity and heightened interest in the world around. After reaching the age of 8 years the cat enters the period of middle age. As with humans, this period in animals can proceed differently: some cats are healthy and full of energy, and some begin to experience the effects of approaching old age.

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  • Author: Aleksbell
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I want to present another version of a homemade gearbox.For this, I used a helical gear pair from the gearbox of an angle grinder, the set costs 4 (took the cheapest).The gear ratio is 2.692 (13/35).These reducers are already on my homemade machine on all axes and work fine. Advantages. factory quality gears, high-quality steel, helical gears make less noise during operation, the tapered cutting of the teeth facilitates adjustment and assembly, etc.к. the taper is self-aligning and self-compacting (for threads) connection allows for maximum dense, almost no backlash, gearing. Disadvantages. the motor shaft will be located perpendicular to the propeller axis that may not always be convenient, you must exactly make a coupling adapter for the drive pinion and the landing for the driven gear to avoid the possibility of radial runout and as a consequence of play or seizure during rotation, you must maintain alignment of the drive shaft and the propeller when assembling the node. If all the conditions are met, to adjust the tightness of the meshing is sufficient to move the coupling with the pinion along the drive shaft, achieving minimum clearance.