DIY kamaz engine repair stand drawings

In detail: stand for repairing a KamAZ engine with your own hands; drawings from a real master for the site my.housecope.com.

Greetings to all! When I got a job with this person, whom I now work for, he had a stand for repairing KamAZ engines. But in what condition he was. Initially, according to the factory, it contained an electric drive - an asynchronous electric motor, a pair of starters, a belt drive, a two-stage worm gearbox. When it fell into my hands, an electric motor dangled in it, there were no side and top covers at all, there were almost no starters, and no belts. The two-stage gearbox was driven by a handle welded to the pulley a la "curve starter". For a long time all this infuriated me, it took five minutes to turn the engine in the stand. He just sat down on a stool near the stand, smoked with one hand, and twisted the handle with the other. Kick-ass. As always, there was not enough time for repairs, they were not given. But I still snatched a couple of days and did everything as it should be:

Now it's a completely different matter: you pressed the button, hold it until the engine turns to the desired position, let it go - the stand has stopped. Left button - rotation to the left, right - to the right. And just in case, I retained the possibility of a manual drive - I made an adapter for a standard 1/2 ″ tool, if you want, stick a ratchet in there, if you want a brace, if you want - just an L-shaped knob and twist it for your pleasure. This may be necessary if there is a power outage, or the stand is installed in a place where the cable does not reach.

Now turning KamAZ engines is a pleasure for me. And there is no time to smoke. The engine can be rotated 180 degrees in a matter of seconds.

Video (click to play).

P.S .: Alexey 733701, I remember your request to remove the dimensions and thicknesses of materials for the YaMZ engine stand. I just don't have enough time for this. As soon as I assemble the motor in it, I will pull it out of it, while I am completing it - the locksmith is already stuck in the next motor, they begin to wash it, partially disassemble it. And so in a circle. But I will still find time and be sure to fulfill my promise. I'm only afraid - not to be late. Otherwise, you wait, wait and do everything yourself, at your discretion, without waiting for my prompts.

In this section, in accordance with the assignment, the design of a stand for disassembly-assembly of 740.11 engines of KamAZ vehicles is being developed and proposals for improving the operation of this design are indicated.

The purpose of this section is to develop a design of a stand with an electromechanical drive of increased reliability through the use of a gearbox with a large gear ratio, which will eliminate the need for a manual drive.

In the motor section of the ATP, the engines removed from the car are being repaired. When repairing engines, like other vehicle units, disassembly and assembly work is performed, the quality of which largely determines the quality of repair. For high-quality and efficient performance of dismantling and assembly works at the enterprise's motor depot, there is a special stand of the R-770 brand, the design of which provides convenient access to any parts of the engine during dismantling and assembly operations. The method of disassembling and assembling engines on a low metal table, which is practiced in some ATP and service station, is ineffective and dangerous, since the engine has to be turned to various unstable positions all the time.

In the engine section of this enterprise, a stand is used for disassembling and assembling engines, equipped with a manual drive to change the position of the unit during the repair process, which is inconvenient and unproductive.

General view of the stand for the repair of KamAZ engines

Assembly drawing of the stand for the repair of KamAZ engines

6.1. The device and the principle of the stand

6.2. Calculation of stand elements

6.2.1. Kinematic calculation
6.2.2. Determination of the shaft diameter
6.2.3. Calculation of bolted connections for shear and shear
6.2.3.1. Calculation of tool table fixing
6.2.3.2. Calculation of the motor and gearbox mounting
6.2.4. Calculation of welded joints
6.2.4.1. Calculation of welded joints for fastening the rack
6.2.4.2. Calculation of welded joints of the motor and gearbox mountings
6.2.5. Calculation of the strength of the rack

6.3. The results of the implementation of the stand for disassembly and assembly of engines

Explanatory note 12 sheets of description and calculations, specifications.

Surely every car owner has heard about engine repair stands. Below we will consider what it is, what characteristics does such a device have, and, of course, is a home-made option suitable?

Of course, we all want our vehicle to serve us for a long time and at the same time to be in excellent working order all the time. However, this only happens in fairy tales, and in practice even new cars taken from brand showrooms need to be repaired within a few years. And what can we say when the owner does not spare his "iron horse"? In general, many factors contribute to the failure or incorrect operation of one of the main parts of an auto - engine.

So, let's look at the main mistakes that lead to such dire consequences. As already mentioned, incorrect operation of the vehicle is reflected in the most negative way, for example, the use of unsuitable fuel or low-quality technical fluids. Untimely oil and timing belt change, constant overload of the car will also negatively affect. Even disastrous will be the neglect of the engine's need for warming up in the cold season. And what can we say about malfunctions after mechanical impact due to an accident?

Read also: DIY Audi a8 repair

It is not so important why the unit failed, in any case, the result is the same - the need for diagnostics and further repair work. In this case, a special stand used for such purposes will be indispensable. A suspended motor is attached to it, and then it becomes much easier to diagnose, transport and repair the unit. In addition, most of these mechanisms are equipped with a special unit, thanks to which the angle of rotation of the engine can be changed in any range, which greatly facilitates the work carried out.

But, like all fixtures, such a stand also needs good care. Therefore, be sure to carry out a visual inspection to search for defects, and if there are any, then the operation should be postponed. Before each use, check whether all fasteners are securely fixed, if not, then make a constriction. And of course, keep it only in a dry and clean place, remove all debris after each use, and lubricate all moving parts regularly. Only with proper operation, the stand, even a homemade one, will serve for a long time, reliably and will pay off if you are going to become a minder.

So, working with such stands is quite simple, but do not forget about safety precautions. At this point, we will pay attention to how to properly operate such devices. It is strictly forbidden to exceed the permissible tonnage, otherwise the structure may not withstand overloads, and the engine will fall... The consequences of such a situation can be very different, and the least is damage to expensive equipment.In addition, pay enough attention to the choice of the surface on which this object will be located, it must be flat and, of course, capable of withstanding significant loads. Image - Stand for repairing a KamAZ engine with your own hands drawings

The next criterion is the installation of the load. Before repairing the engine, it is necessary to securely fix it strictly in the center, while acting with extreme caution and accuracy. Remember, even your life can depend on the reliability of the fastening. And, of course, if you purchased such a stand in a store, then you do not need to make any adjustments to its design, trust the professional developers.

We figured out the purpose, care and operation of this device, and, as you can see, it is an indispensable attribute especially for beginners and professional minders. But he has one rather serious drawback - it is high cost, so not everyone will be able to immediately give a tidy sum. And if, in addition, you are not confident in your abilities and then abandon self-repair, then as a result, there is a high probability of being the loser. So let's look at how to design a homemade stand used to repair engines.So, if you are going to make a living with this, and not just maintain only your car, then you should make the stand universal. After all, for example, for the engine of domestic cars VAZ ordinary flange fasteners to the rear are enough, but the engine from Bmw so you can't fix it. Therefore, it is necessary to weld a pair of channels with ten-millimeter holes with a pitch of 50 mm to the rotating plate, and the latter should be located in the area of the motor mountings. But in order for the part to rotate quite easily around its own axis, its center of gravity must be strictly opposite the axis of rotation of the aforementioned plate. Image - Stand for repairing a KamAZ engine with your own hands drawings

Thanks to the holes on the channels, it becomes possible to mount motors of various sizes through adapter brackets.

The use of a manual hoist, which moves on beams, makes it possible not to construct a lifting mechanism above the stand, it is enough just to install it on the wheels, of course, they must be quite powerful. So it will be possible to simply roll the defective part to any place, and if this unit is not used, then it is also very easy to remove it to the far corner.

Quite often, repair work also involves flushing the engine, and keep in mind that this unit accumulates an incredible amount of dirt, and, naturally, in order not to deliver it across the garage floor, a pallet should be placed at the bottom of the stand. In this case, a fine mesh should be put on top of it, because the strong pressure of the jet can knock some small part off the engine and it will be much easier to detect it on the mesh than at the bottom of the pallet. In addition, you can put the elements of the disassembled unit on it and rinse them.

On the stead, you can additionally repair the ZF gearbox (for additional equipment, see the price list)

Designed for the repair of automobile engines, gearboxes, transfer cases, rear axle gearboxes, etc. mainly in the field.

Depending on the type of the unit being repaired, the rotator can be assembled appropriately with the equipment intended for this unit.

For ease of transportation to the place of repair work, the rotator can be easily disassembled into separate units, and the bed is folded.

For work in the field, the tilter is equipped with rails.

Tilting type - mobile.

By the type of assembly, the tilter can be assembled:

in single-column version - execution - 1

and in a two-column version - version - 2

Execution-1 is intended for the repair of gearboxes, transfer cases, rear axle gearboxes, etc.

Execution-2 is intended for the repair of automobile engines and other large-sized units.

Length, mm. ... ... ... ... ... ... ... ... 1500 ... 2000

Name

Drive head. ... ... ... ... ... ... ... ... ... LPN-086.00.000

Support head. ... ... ... ... ... ... ... ... ... LPN-087.04.000

Outriggers are unilateral. ... ... ... ... LPN-087.02.000

Outriggers are double-sided. ... LPN-087.05.000

Track (rails). ... ... ... ... ... ... ... ... ... LPN-089.01.000

A set of interchangeable adapters on request

The stand for automobile units SDU-100 is intended for repairing KAMAZ, YaMZ, CUMMINS, gearboxes and RK ZF engines, 43114 transfer cases, rear axle gearboxes, etc.

Depending on the type of the unit being repaired, the rotator can be assembled appropriately with the equipment intended for this unit.

The stand is sliding, so it can be used for most engine models.

The stand is equipped with wheels, therefore it is mobile in moving around the workshop or repair shop.

The delivery set includes adapters for KAMAZ-YAMZ internal combustion engines, all other adapters are purchased separately.

Homemade cars, tractors, ATVs and ATVs

Homemade stand tilter for disassembling and assembling engines.

I made a rotator for the engine, you can install the engine with everything attached to the device, turn it and fix it in the desired position. The device is made in such a way that nothing interferes with completely disassembling the engine to the block.

Channel - 60 mm.
Channel - 50 mm.
Pipes - 36 and 28 mm.
Metal plates 8 mm - 2 pcs.
Trolley wheels.
Galvanized piece.

The homemade design is shown in the photo.

The axis of rotation of the engine is located in its geometric center.

The frame is made of a 60 mm channel, and the struts are screwed to the frame with supporting hinges at the top. The hinges are made of pipes and open on hinges.
After installing the engine with feet on the stand, the hinges are closed and fixed with nuts.

You can fix the engine in the desired position with a removable clamp, just loosen the clamp, turn the engine and clamp it.

On a pair of wheels, diagonally, I made a stopper from a curved plate, which is bolted to the frame and clamps the wheel.

A pallet made of galvanized roofing sheet is installed under the engine.

Dimensions: frame 600 x 800 mm, rack height 350 mm.

An engine repair stand is a device on which the power unit is fixed after being removed from the engine compartment of a car. This solution significantly simplifies the process of cleaning and inspection, as well as disassembly, troubleshooting and repair of the engine. Also at the stand for repairing the engine, the subsequent assembly of the power plant and transportation, if necessary, is carried out. In other words, it is much more convenient to carry out any work with the internal combustion engine when there is a disassembly - assembly stand for engine repair in a car workshop or garage.

One of the main advantages of this device is that the motor, fixed on a multifunctional engine tilt stand, can be turned at different angles. This feature allows you to improve the quality and convenience, as well as simultaneously reduce the time for repair and other work. In view of the above, such devices are in significant demand. On sale today are both finished products from well-known manufacturers, as well as more affordable offers from small manufacturers. In this article, we will talk about what characteristics should have and what functions such a stand is capable of performing, whether it is possible to make a homemade stand for engine repair, and also what requirements are put forward for such a device.

Various devices for fixing an internal combustion engine assembly, solutions for fixing individual components of a power unit, a ready-made stand for engine repairs, etc. have the main requirement, which is the reliability of fastening, as well as the stability of the stand itself. In parallel with this, it should be borne in mind that the stand must be serviced periodically.

For this reason, there must be free access to the fixing and fastening elements, which will allow visual inspection, lubrication of moving parts, eliminate a defect or tighten fasteners and other structural parts. This is especially important to consider when a stand for motor repair is made independently. Remember, only correct operation and maintenance will allow talking about the safety of the device and the maintenance of the device in working order.

Let us add that the site on which a mobile or other stand is also deserves special attention. The surface must be firm and level, not crumbling under the influence of severe stress. It is also important to take into account that fixing the load itself on the stand involves placing the motor or a separate unit (for example, a BC) exclusively in the center in order to avoid distortions. After placement, you should additionally check the reliability of the fastening before starting any work. It is also necessary to independently make any modifications or changes to the design of the finished factory stand after careful calculation. The owner carries out such actions solely at his own risk.

Let's start with the fact that finished products are an excellent option if the service for the repair of power units and assemblies is delivered, so to speak, “on stream”. In other words, the high initial cost of such products of proper quality often prevents many from purchasing disassembly and assembly stands for both personal use and for working in garages and even small service stations.

For the above reason, craftsmen and owners of small auto repair shops stop at the option of self-manufacturing stands, which are used to repair engines. Note that the drawings that are presented in the technical literature, and are also found in large quantities on the Internet, will help to make a stand for repairing an engine with your own hands.

A simple engine repair stand has several basic basic elements:

plate for securing the internal combustion engine;
stand base;
special baking tray;
swivel mechanism (usually worm-type);

It should also be noted that the stand should be a mobile device and be a universal solution. To put it simply, some stands for disassembly and assembly may be a suitable option for working only with a specific type of engine or allow you to work with a narrowly limited category, while others provide the ability to install and securely fix all kinds of internal combustion engines.

For this reason, even if initially the tilting stand is made for servicing your own car, it is better to make the device universal, since in the future there may be a subsequent need to repair other machines. As an example, we can mention the engines of the domestic manufacturer AvtoVAZ, which can be mounted on the stand using flange fasteners at the back, while reliable fixing of the engine from a foreign car in this way will no longer work.

In parallel with this, it is necessary to place the engine or a separate unit so that the center of gravity of the fixed part is opposite the axis of rotation of the rotary plate. This will allow the attached power unit, individual part or assembly to rotate effortlessly. Equipping the stand with wheels that can withstand heavy loads will facilitate the installation of the unit on the stand, as well as provide the ability to move large parts right on the stand. This eliminates the need for frequent use of various lifts during the repair of the internal combustion engine.

A mesh with fine meshes is additionally installed on the top of the pallet. The specified mesh is necessary in order to place on it and then rinse the removed elements over the pallet.Also, the net allows you to hold small engine parts that may fall into the pallet during washing or repair work.

Why and how to run in a gasoline or diesel engine after a major overhaul. Driving modes, features of the break-in process, the first oil change.What is a valve desiccant and what is it for. Existing ready-made varieties of special tools. How to make a valve desiccant yourself.Symptoms of malfunction and check of injection nozzles without dismantling. Diagnostics of injector power supply, performance analysis. Tips and tricks.When it is necessary to bore the crankshaft of the engine, for which the bore of the crankshaft is needed. How the crankshaft is bored, especially the selection of liners.Features of operation and causes of malfunctions of diesel injectors. How to independently remove, troubleshoot, disassemble and repair diesel engine injectors.Diesel injector malfunctions, check and self-identification of problems. Cleaning the nozzle of the diesel engine injectors, adjusting the injection pressure.In order to buy this product, fill out the application belowBy clicking the "Send" button, you accept the terms of the User Agreement and give your consent to the processing of your personal data, in accordance with the Federal Law of July 27, 2006 No. 152-ФЗ "On Personal Data", on the terms and for the purposes determined by the Privacy Policy ...Stand R-776-00K intended for assembly and disassembly of diesel engines and gearboxes of the KAMAZ family (740, 741, 7403-10,740.11-240 (Evro-1)). The design of the stand allows you to hang out the unit being repaired in order to fix it in a convenient position during repair.Rotation of the frame by 360 ° allows repairing any hard-to-reach units of diesel engines of the KAMAZ family. The turning process of the unit being repaired is achieved by a manual drive using a worm gear.This stand is widely used as a modern professional equipment for equipping car service enterprises, service stations and garages.

Mechanical manual drive;

Modern design;

Unique structural strength;

Ease of use;

High ergonomic performance.

The stand is installed on a flat concrete floor. The surface of the R-776-00K stand is painted with a special corrosion-resistant powder paint and is supplied in colors that correspond to the customer's request.In our company you can buy a stand r-776-00k for assembling and disassembling engines and KAMAZ gearboxes at a favorable manufacturer's price. The goods are shipped from the company's warehouse located in Rostov-on-Don. Also, you can order the delivery of equipment to your city using the services of a transport company.Delivery of equipment purchased from our company is carried out to all regions of Russia, Belarus and Kazakhstan. Delivery regions Image - Stand for repairing a KamAZ engine with your own hands drawings

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The main means of reducing wear of parts and mechanisms and preventing vehicle malfunctions, i.e. maintaining it in proper technical condition is the timely and high-quality performance of maintenance and repair, both major and current.

Knowledge of all the factors and patterns of changes in the technical condition of cars allows you to properly organize work to increase its power and durability, through timely and high-quality maintenance and repair.

Read also: DIY CRDI nozzle repair

As a design development, we presented a stand for fixing engines, and if there are additional brackets and other units in a suspended state and fixing them in a position convenient for assembly and disassembly and repair work.

After analyzing the known devices and stands, we came to the conclusion that all analogues have certain disadvantages. The stand presented as a design development has brackets installed coaxially. Thus, the stand has the ability to rotate around a horizontal axis. One bracket is mounted on the worm gear shaft and rotated with a handle, which makes it possible to set the unit in a position convenient for carrying out repair work. The stand can be made on your own in the workshop of the enterprise.

The solution of fixing brackets for installing units makes them easy to replace and allows you to quickly re-adjust the stand to work with various engines or units. Completing the stand with new brackets, you can further expand its functionality, which distinguishes it from analogues.

Description, purpose, principle of operation.

The stand is intended for fixing engines, and in the presence of additional brackets and other units in a suspended state and fixing them in a position convenient for assembly and disassembly and repair work.

The design of the stand for disassembly and assembly of the engine is shown in Figure 3.3.

Figure 3.3 Stand - tilter for disassembling and assembling engines: 1- frame, 2- swivel brackets, 3- worm gear, 4- swing handle, 5- bath for collecting technical fluids.

The stand consists of a welded base-1, on which brackets-2 are attached, for installing an engine or other unit on the stand. The brackets are installed coaxially and have the ability to rotate around the horizontal axis. One of them is installed on the shaft of the worm gear -3 and turns with the handle -4, which makes it possible to set the unit in a position convenient for carrying out repair work. The bracket does not require additional fixation, because the gearbox is self-braking. A -5 bath is installed under the brackets, which prevents oil, cooling or cleaning liquids from falling on the floor, which may remain after draining or washing.

Strength calculation of bracket elements for mounting motors

The most loaded and critical structural unit are the brackets. We will make a verification calculation of the bracket for installing engines of the ZIL, KAMAZ brands. Let us check the conditions for the fulfillment of the strength pa bending in the place with the maximum value of the bending moment - in pinching. This moment will be created by the force of gravity of the engine. The distance from the embedment of the lever to the edge of the bracket is H = 0.44m. The weight of the engine creates a force of gravity equal to F = 784.0 N. The brackets are installed symmetrically and relative to the center of gravity, and a force equal to half this value will act on each of them. Hence the maximum bending moment on the arm of the bracket:

Using the design equation for bending, we find the required bending resistance,

W_x 3450/120 • 10 6 = 28 • 10 -6 m 3 = 28 cm 3

Figure 3.4 Kinematic diagram of the bracket

From here we determine the minimum shaft diameter

Let us choose the nearest higher value for a number of normal linear dimensions. We accept the shaft diameter D = 45mm.

Let's make a strength calculation of the welded connection of the arm to the shaft.

We will make the calculation for the combined action of shear and bending.

where f_Wed = F / S? [f_Wed] - shear strength equation.

S-seam cut area, for side seam

b - the length of the side seam is structurally b = 120mm.

d-width of the welded metal d = 10mm.

[f_Wed] - permissible shear stress of the seam material:

b1-coefficient, taking into account the type of welding, for manual welding b1 = 0.6

at_AND - bending stress arising in the seam material:

H-Distance from the base of the seam to the direction of the force. Structurally, we got H = 440mm

Name and scope.

Stand for assembly and disassembly of the KamAZ-740 engine. It is intended for assembly and disassembly of the KamAZ-740 engine of KamAZ vehicles. The product is used at auto repair enterprises and repair centers of workshops of enterprises.

When designing, I was guided by technical literature, reference manuals, methodological literature and catalogs of garage equipment presented by the Department of Operation of Cars and Machines of the Forestry Complex, as well as the Department of Design Basics and Applied Mechanics.

Use in repair production conditions requires ensuring the necessary reliability, i.e. failure-free operation until the next certification. To increase the level of technicality and unification, samples of similar equipment already mastered by the industry will be taken as a basis. Taking into account the specialty of the work, increased safety requirements are imposed on the stand.

A stand for assembly and disassembly of diesel engines of trucks of model Р 770 and model Р 776 are shown in the figure.

The stand is designed for assembly and disassembly of YaMZ-236; -238 engines.

The stand type is stationary, with an electromechanical drive (P 770), with a manual drive (P 776).

The stand consists of a stationary and a mobile stand. The stationary stand is rigidly fixed to the crosspiece. The vertical position of the mobile rack is due to the keyed connection, which at the same time limits its movement along the length. Trays for tools are mounted in the upper part of the stand, and a tray for draining used oil is installed in the lower part.

The engine on the stand is attached with pins inserted into the holes in the cylinder block. It turns 360 0 to the position most convenient for work, in one case by an electromechanical drive (P 770), and in the other by rotating the handle of a two-stage worm gear (P 776).

Homemade buggies, ATVs, ATVs

Message alkozlov Mon Dec 09, 2013 7:49 am

Well, I also missed the day at work.

Message Staford Wed Dec 10, 2013 12:48 am

Today I bought the metal, welded the main part. I also made paws. Tomorrow I will take the plate and pipe from the milling machine, then finish it. Later I will weld a basin for oil and dirt in general on the bottom.

"It's impossible!" - said the reason
"This is recklessness!" - noticed experience
"It's useless!" - cut off pride
“Try it. "- the dream whispered.

Message stus Wed Dec 10, 2013 11:16 am

Message Staford 09-03-08 10:25 pm

Dovaril!))) To check with my father, they hung up the VAZ block, it hangs like that, V6 did not hang today - the bolts are on the street in the car, tomorrow I will hang it))))) Now it remains to paint)))

"It's impossible!" - said the reason
"This is recklessness!" - noticed experience
"It's useless!" - cut off pride
“Try it. "- the dream whispered.

Message Alexis.79 Sat Dec 14, 2013 10:21 pm

Message ANDROV Mon Dec 16, 2013 3:10 pm

Message Anatoly Galkin Mon Dec 16, 2013 7:56 pm

Staford wrote: Today I bought metal, welded the main part. I also made paws. Tomorrow I will take the plate and pipe from the milling machine, then finish it. Later I will weld a basin for oil and dirt in general on the bottom.

Message Staford »Mon Dec 23, 2013 1:40 am

There is a beam, and talcum rolls along it)) They broke off with the powder, painted it with free blue paint like the compressor)))

Thinking not much strengthened.
As a result, I can say that I am quite satisfied with the stand, it is doing fine, I will think what else I need))))

"It's impossible!" - said the reason
"This is recklessness!" - noticed experience
"It's useless!" - cut off pride
“Try it. "- the dream whispered.

Message KimIV 09-03-07, 08:26

Message MwbG 09-03-07, 08:10

Message Yuri 13-03-07-08: 01:44 Tue Dec 24, 2013 7:44 pm

And I have one. Pivot points - rear hubs of nine VAZ, the center of gravity of the engine approximately on the axis of rotation, easily turns, is fixed every 45 degrees. The engine is installed on standard brackets (although for each type of engine you need to make your own mounting adapters - seen in the photo). The pallet is installed downward when cleaning-washing the engine. Allows you to start-running the assembled engine when installing the bell with a starter.

Administrator
23,458 posts

Name: Alexey

Weekend design.

I rented a stand for repairs, but I had to give it away, the owner needed it. Urgently made myself the same. Costs / expenses: 900 rubles for a square tube 60x60, electrodes, a circle for a grinder. I will fasten the wheels after painting. The last picture is the original.

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        Name: Alexey
        
        Fastened to the gearbox bell mounting holes. So as not to interfere with the flywheel, there are spacer tubes.
        
        Square plate - a piece of channel 12 mm thick, racks for mounting the engine - a square bar 20x20. Hardened bolts from some kind of car, bought in auto parts. The grooves in the slab were first drilled at the ends, the middle was cut out with a grinder (this is faster than milling). To the lower frame, the corner is vert. the stand is attached with 4 bolts, as on the original.
        
        Video (click to play).
        
        The design is repeatable at home without any major equipment. Welding and grinder
        
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        Grade 3.2 who voted: 82