How to reduce speed of angle grinder

angle grinder or simply angle grinder. A quick glance at the tools

Inspired by the post. What is written below. my personal opinion based on my experience with the tool. Not a truth in the last resort. There are a lot of letters. So, angle grinder or popularly called “angle grinder. tools for cutting and grinding various materials. Can be used with different tooling depending on the materials to be worked on and the type of work. Probably one of the most dangerous tools. So before picking up a tool, think ten times about “Do you need it??”

Let’s start with the safety recommendations. 1. Study the manual on the tool. It says a lot of useful things in it. NEVER trust every video on the Net. There are many fools, but you only have one body. Think with your head.2. Use PPE. About this below.3. Never remove the hood. NEVER. It’s the only thin barrier between your body and a projectile potentially traveling at 80m/s (which is the operating speed of a cutting wheel) 4. Do not use accessories of unknown purpose and origin. An easy way to understand what you can work with and what you should avoid: go to the catalog of any well-known tool manufacturer and see if they have this type of equipment. As a rule, engineers from companies making good tools, think through and safe tooling for it, unlike the hardworking guys from the Celestial Empire who can dump anything on the market.4. Use the tooling for its intended purpose. Every disc has information on it, what it is for. And don’t try to saw with an expensive diamond blade on ferrous metal, aluminum. The disk will fail very quickly. Don’t put a larger diameter disc. It is bad for the tool and for you. And the casing won’t let you do that either. And you can’t take it off.5. Change tooling. unplug/unplug the battery. The fingers won’t grow back. 6. Think about what you’re doing. Always imagine how the disk and the workpiece will behave, whether the disk will bind, whether it will jam, whether there will be no misalignment. Don’t be afraid of the tool, hold it firmly and confidently in your hands. It’s still scary? Maybe the angle grinder isn’t your thing? Buy a chain saw and cut metal with it. Yes, it’s expensive, not everything can be replaced by an angle grinder, but it’s much safer. 7. Sparks from an angle grinder can easily ignite things that can burn, such as chips or oily rags. Tested by.8. Reread the instructions again and check that the cover is attached. Personal Protective Equipment1. Glasses. Make sure it’s. Always. Even if “here once cut” According to the law of the world pig, the dross will fly at a time when you’re without glasses. I’ve been hit once. Cried for two weeks. Your eye is watering. You’re lucky it went off without a hitch. You have to buy good goggles, closed goggles. That don’t sweat. There are foreign brands and ours. The main thing is not to mist up and be comfortable for you personally. Example below

reduce, speed, angle, grinder

2 Respirator. You always need one. Even if you work outdoors. Do you want to blow your nose with black snot and smell metal?? No then Respirator is for you. The best option. half mask aerosol filter. Due to the current epidemic, hard to find on sale, but much more comfortable to work with than disposables.

3 A tarpaulin apron. Burn the new pants with a stream of sparks. priceless. So it is better to wear an apron. 4. Gloves. in my opinion the most controversial point. I work without gloves with any rotating tools. Hooking gloves on something rotating can cause serious injury.

Choice of tool. This post is first of all aimed at beginners. To begin with, I recommend to buy an angle grinder with a diameter of 125 mm. Or 150mm. For home and small jobs. best. 115mm. very small. 180 and 230 are simply not needed in the home. Or rarely needed. In terms of power. Up to 1000 W can and should be used for sawing (cutting) with thin discs. I do not recommend to grind. easy to kill the engine. From 1000 to 1500 W. optimal. You can cut and grind, metal and concrete and other materials. than 1500- at home and at the cottage. don’t need it. Take a well-known manufacturer. Unknown brand. the quality of the product is unknown. And in case of breakage you will not find spare parts anywhere. Just throw it away. All well-known brands have not expensive angle grinder. RPM adjustment. It’s better to have it than not to have it. All sorts of protection. mostly marketing. There is little need to chase them. 10 times it works for 11 times it does not. Learn to work properly.Work1 clamp the workpiece securely. In a vise or with clamps.2 take an angle grinder with TWO hands. Hold firmly and firmly. 3. Smoothly approach the tool to the workpiece.4. Start cutting5. ProfitA couple more recommendations. There is no need to reduce the RPM, abrasive discs are designed in such a way that they need high RPM to work properly. At low speeds there is as much chance of fracture and chipping on the disc as there is at high speeds. And the work efficiency drops dramatically.

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In my next post, I’ll do a tooling guide. If you do everything in one station, it would be too much.

Design and principle of operation

There is a huge selection of angle grinder, which differ by manufacturer, technical characteristics and price. But the design and principle of operation of the angle grinder is the same. Inside the two-piece housing, the grinding wheel or other tool is mounted:

  • Collector electric motor of a certain power;
  • Gearbox, connected to the motor shaft and is responsible for the rotation of the cutting or grinding wheel;
  • spindle that comes out of the gearbox at right angles (hence the name of the machine. “angle”).

The grinding wheel or other attachment is fixed on the spindle. On the body of the angle grinder screwed one or two handles, for which it is convenient to hold the tool during work. The essential parts of the tool: the power button, the latch and the safety guard. There’s no need to go into the intricacies of the electronics, because the choice must focus on the technical parameters of the machine.

Angle grinder electrical equipment layout

Over 40 years, the appearance of angle grinder has not changed: oblong body with built-in motor and gear box, screwed on the side handle and protective casing.

The angle grinder, like any tool, will sooner or later stop working. But there are situations when the simplest repair of electrical equipment is enough to eliminate the malfunction. To perform this minor repair, you need to have an idea of how such equipment works inside, and be able to read its electrical scheme.

The electrical circuit of the grinder consists of such elements:

Speed controller and soft start for angle grinder

Both are necessary for reliable and convenient operation of the power tool.

What is a speed regulator and what is it for?

This device is designed to control the power of the electric motor. Use it to regulate shaft speed. The numbers on the adjustment wheel indicate the change in rpm.

Not all angle grinders have a variable speed drive.

Karigars Angle Grinder slow speed low rpm problem repair

angle grinder with a speed regulator: examples in the photo

The absence of a regulator greatly limits the use of the grinder. The disc speed affects the performance of the angle grinder and is dependent on the thickness and hardness of the material to be grinded.

If the speed is not regulated, the revolutions are constantly kept at the maximum. This mode is only suitable for hard and thick materials, e.g. angles, tubes or profiles. Reasons why the presence of a regulator is necessary:

Subtleties of operation

If the regulator is assembled correctly and adjusted, it will be convenient to turn on the tool at low speeds, when there is no jerk. When working, especially in view of the increased danger of the angle grinder, you must make it impossible to accidentally act on the regulator knob. This is especially important if the regulator is built into the cord, close to the body of the angle grinder itself.

If before the machine did not have a regulator, you need to keep in mind that this regulator will tend to maintain close to idle speed under load, so there is no need to especially speed up the angle grinder under a heavy load. When the resistance of the material to be worked slows down the disk, the voltage at the current sensor increases by increasing the current and the voltage at the motor slightly decreases. The microcircuit reacts to this by changing the angle (triac opening torque) in the direction of increasing the power.

If the current is too high, the protection trips and the angle changes to lower power. So you may have to adjust R9 by experimentation, changing the calculated resistance within small limits.

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What’s the point:There’s a neighbor who uses an el.the mains of the large industrial furnaces (heating veins/spirals), there is evidence that it makes the mains light 140-150, 150 Carl!

reduce, speed, angle, grinder

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Paano magkabit ng Variable speed Control sa isang angle grinder

Neighbor himself showed, and I all filmed on video, automatic circuit breakers are above the norm, the norm 15-25 he stands at 100 (so as not to knock out). Did video recording measurements, if he had all the electricity coming into his plot turned off. on the network becomes 200. As soon as he turns on the switchboard is 170, and if you turn on the furnace in the network floating is from 140 to 160.

The electricians who work in the area came, he bribed them and they did not touch him.

Called the divisional. The result was the same, only they took him away in the car for some reason. I’m supposed to write an explanatory note. The next day the neighbor said that he was charged again, and in general it’s not neighborly to do so.

I have a light. This G. Already wildly infuriating, every day, he turns on his ovens until about 10 pm, and while his ovens are on, my appliances stop working: refrigerator, microwave, computer.

We have: Neighbor of Uzbek nationality, who made a shop at home for the production of buns and other bullshit.

reduce, speed, angle, grinder

In the next room he has a tandoor and gas ovens for flatbread. And the other half of the site he has a dormitory. There are the same crowds of Uzbeks who do not speak Russian well.The neighbor himself has repeatedly admitted to giving bribes, and he even sent voicemails on WhatsApp: that he was cheating everyone and gave money (without specifying to whom exactly).

So actually the whole question is this: where to call/write to complain?

I wrote a report to the police, the answer came back: Considered without proceeding.-I wrote to the service company in the mail.I was ignored.On Monday, I plan to go over there in person and write a handwritten statement.

I also want to go to the financial police to write a statement on the following: that he bribes everyone, there is evidence (albeit vague), but still his words on the record. Maybe it will have some effect. although there are doubts.

Should I call the fire department?? Safety is very bad there. Open fire, tandoor and high-powered ovens. And the room is lined with ordinary OSB.

The tax collectors? Since he does not have a separate line for the production, and then with a IP it is not so smooth, because for powerful devices must be permission?

SanPiN? There’s terrible unsanitary conditions, finished products are stored on racks outdoors. The “shop” itself with dust and dirt, and masks, aprons, head netting. is out of the question.

What other ways are there to apply pressure??I would be glad to advice.

P.S.Don’t offer to hit me in the face. And then the ko-ko-ko diasporas will pull up.

I wrote emotionally, there may be errors in the words.

Why an angle grinder soft start and a speed regulator?

In modern angular grinders use 2 necessary options that increase the performance and safety of equipment:

  • Speed regulator (frequency converter). a device designed to convert the number of revolutions of the motor in different modes of operation;
  • Soft start device. a scheme that provides a leisurely build-up of motor RPM from zero to the limit value when the unit is connected.

They are used in electromechanical equipment, in the structure of which an alternating current electric motor with a collector is practiced. Help reduce wear and tear on the machine’s mechanical components when switching on. Reduce the load on the electrical components of the machine by putting them into operation smoothly. As revealed by studies of the qualities of the materials, especially the strongest wear and tear of the contacting parts is produced during the sudden transition from a stationary state to a fast activity. For example, one start of an internal combustion engine in a car is equal to the wear of the piston and the group of compression rings by 700 kilometers of run.

When power supply is made a jump from stationary state to the rotation of the wheel with the swiftness of 2.5-10 thousand revolutions per 60 seconds. Anyone who has ever used an angle grinder knows very well the feeling that the tool just “flies out of my hands. That’s exactly the moment when most of the accidents involving the mechanical part of the machine happen.

Power controller for the power tool.

Hello! Of all the tools I have, the most used. angle grinder (angle grinder). In addition to cutting various materials, it is very often used for scraping, sanding surfaces. When working with wooden materials, the flap discs often burn the wood. Too much speed. Velcro circles on tiles also tend to fly away from the centrifugal force. The solution saw in the addition of an angle grinder speed regulator. The criterion for the search was the ability to be built into the body of the tool at the lowest cost.

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Another angle grinder has been faithfully serving me for the past six years. Manufacturer DILD, under 125 wheel. precise designation was erased by time, and I do not remember. I didn’t want to make a remote regulator. There is a little space in the handle. Looked at the size of the knob on the merchant’s page and decided that I would put it in, so I ordered. It took about a month for the package to arrive, the track was not tracked. Product page specs.

Model: 6 Speed Maximum voltage: 250 (V) Rated heating current: 6 (A) Operating temperature: 0-50 © Material: Plastic.

Not 6 speeds, of course, but stepless adjustment by potentiometer. Figures for clarity.

reduce, speed, angle, grinder

Length: 30 mm; Width: 17 mm; Height: 30 mm. On one end of the el. Specifications. On the opposite. the circuit diagram.

The approximate wiring diagram of the device. The regulator under review differs only in the trim potentiometer and the switch (further 6 positions el. Adjustment is switched off and the tool is powered directly).

The inside of the housing looks like this. Triac is used VTB08.

VRRM, V 600 IT(RMS) (max.), A 8 VDRM (max.), V 600 IFSM (max.), A 84 IFT, mA 35 dV/dt, V/µs 400 dI/dt, A/ms 4.5 TA,°C from.40 to 125 It can be used without radiator up to 1000W The board is made of textolite. Reverse side only soldered.(I got fluxed, the complete wires are short) Disassembled angle grinder. There was only room for it here.

Sawed a hole in the case. Angle grinder handle body made of tough plastic. The regulator fits in very snugly. Did not saw through.

The layout is good. Does not disturb when working with the tool. About 5 mm did not fit all the way to the end, not critical at all. The main thing is that it is easy to use.

Regulator changes voltage smoothly. Connects in the gap of the supply wire. Voltage on the first position is 154 V. In the sixth position 201 V.

I have a low-power angle grinder, so the 1 and 2 positions when cutting metal stops. But from 3 and on it works great. What I expected from the regulator, I got. At work, I was sharpening tiles. The head does not try to escape from the platform, there is less vibration and there is not such a column of dust. Petal wheel chamfered the end of the board. does not burn. Now the angle grinder fully lives up to its name (angle grinder.machine). I turn the angle grinder on the direct connection to the network, and then turn it down to the right speed. Although it starts at low rpm. Maybe I should, but just in case. This is in the video.

Thank you and have a nice shopping!

Making speed regulator with my own hands

Trying to adapt a regular dimmer to adjust the brightness of the lamp will not work. First, these devices are designed for a completely different load. Secondly, the principle of operation of the dimmer is not compatible with the control of electric motor winding. Therefore, I have to mount a separate circuit and figure out how to place it in the tool housing.

The simplest thyristor speed controller is easy to make yourself. You need five radio elements, which can be found at any flea market.

Thyristor speed controller wiring diagram for your tool

Compact design allows you to place the circuit in the housing angle grinder without compromising ergonomics and reliability. However, this circuit does not allow you to maintain torque as the RPM drops. Variant is suitable for reduction of speed when cutting thin tin, polishing works, processing of soft metals.

If your angle grinder is used for processing stone, or it is possible to install disks larger than 180 mm, you need to build a more complex circuit, where as the control module uses chip KR1182PM1, or its foreign analogue.

Circuit diagram of speed regulation with the use of chip KR1182PM1

Such a circuit controls the current at any revolutions, and allows minimizing the loss of torque at their reduction. In addition, this scheme is more gentle to the engine, prolonging its service life.

The question of how to make the speed control of the tool arises when it is stationary. For example, when using angle grinder as circular saw. In this case, the regulator is equipped with a connection point (automatic or socket), and the speed is adjusted remotely.

Regardless of the method of performance, the speed controller angle grinder expands the capabilities of the tool and adds comfort when using it.

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