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V Pulley- Things To Know About Them

For transferring power between the two parallel axels V pulley is solely used. The notable variation between other types of pulleys and this pulley is the geometry of the grooves, which are situated around the circumference of the pulley. These groves achieve traction on a v belt.

The V belt pulley provides a mechanical connection with a section that looks like an isolated trapezoid. The complementary pulley and v belt creates the most competent belt drive. These belts were built in the earlier days for torque transmission and belt reliability from the rotation to cracnkshaft assembly. These belts remain as a common type of winding belt today.

Belt Transmission
The transmission of the V pulley is a distinguished upgrade from the flat or round belt transmission. These belts provide a speed, load capacity and excellent traction, while enjoying a extended life with easy substitution. The transmission efficiency is increased by heavy loads since they wedge the belt further into the pulley groove, thus improving friction. However, v belt drives function among 1500 to 6000 ft/min, with 4500 ft /min, which is the ideal capability for standard belts. Some narrow belts can function at speeds of 10,000 ft/min. These pulleys need to be vigorously steady in nature. These pulleys may be located with side-by-side pattern or a singular pulley may possess multiple grooves around the circumference in order to accommodate a multi- belt drive. This type of drive distributes torque across numerous belts and thus providing a mechanical idleness.

Advantage
There are some advantages of these pulleys, which are as follows -
 These pulleys need minimal maintenance with no lubrication.
 These pulleys are extremely reliable in nature.
 There can be slow wear that can be identified easily.
 These pulleys provide great speed range and wide horsepower.
 These pulleys operate in a quite manner.
 There is very little vibrating dampening for these pulley
 These pulleys prevent overload

Types
There are various kinds of pulleys that are used for v - belt transmission, but each has dissimilar implantation. The flat belt pulleys have the similar function of that of the ribbed v-belt pulley, as the pulley rotates in the opposite direction of the driven pulley when the backside of the v-belt is being used.

Standard Pulley - These pulleys have customary dimensions with one or multiple grooves, which mate with small engine and hexagonal style v belts.

Companion Pulley has integral spokes, which move radically on the pulley. These produce high strength to weight ratio that is advantageous to fractional horsepower pulley.

Step Pulley has two or more non-adjustable grooves, which has different pitches located around the same shaft. These pulleys change the speed ration of transmission.

Specifications
There are some of parameters for selecting these pulleys.
* Belt Profile - The sizes of the style is integrated.
* Outside diameter- The distance across the pulley when measured between groove edges
* Grooves- The grooves that are located on the pulley include the angle, number and width of the flanges.
* Contact Arc- The degree of which the belt wraps around the pulley.

 


Expansion Joint - Explaining The Installation Process

In order to allow the telescope movement of inner pipe, expansion joint is installed within a firmly mounted outer sleeve of pipe in order to accommodate the contraction ad expansion in the piping system. These are available in nominal piping sizes with maximum travel lengths. These joints are also used as repair coupling.

Installation Procedure
* One should not weld the mating flanges with the expansion joints. There can be possibility of heat damage or spark.
* There should be proper support for the pipelines so that expansion joint should not carry pipe load.

* In the upstream and downstream, the anchors are placed at both ends of thermally contracting and expanding pipe length. These joints will not function and fall down unless the full thrust anchors are provided in place.

* One needs to check with the manufacturer that the pipe fitting can take the joints thrust, when the mechanical pipe fitting is installed in the joint line. If not, then anchoring for pipe is required on either side and two joints are installed rather than one. The arch area and thrust on the anchor in the pipeline area is multiplied by water pressure. The thrust of the pipe wall is only the area of the arch that is multiplied by water pressure.

* The control units should be used if it is not possible to anchor the pipeline in the above manner. There will no anchor on or both sides of the joint once the control unit is installed. Then the joint will open up the control rod lock out position and will remain in that position. The joint will not act to take up axial motion, rather it will provide make up for angular, misalignment and transverse motions.

* The cable assemblies should be substituted for rigid control rods, where the traverse forces are to be kept to a least. With the value of spherical seats on control seats, the force required to move the piping laterally very high, when control rods are used.

* Before installation of the joints, all the pipes are lined up in an accurate manner. The units will adjust them with the specified limits to misaligned flanges. Thus, it becomes difficult to force the joints to a position before they are rigidly bolted to the flanges.

Inspection Criteria
These joints should not be piled one over another. After a period, the weight will be reduced to face-to-face length. Thus storing in shelves can prevent the reduction of weight. It is important to store the joints where they cannot sustain any sort of damage. These joints should be inspected for soundness and these joints require no maintenance. The detection of the leakage allows ample time for the replacement of flange tightening if it is required. If there is a deterioration of cover, from cleaning, then a coating of hypathelon paint is used to reduce the deterioration. It is good idea to check whether are joints are overly compressed, moving well, elongated or not after installation. Joints should be checked that whether they are operating outside of the rated movements.

 


Gear Coupling - Know The Facts About This Coupling

The curved tooth gear coupling is the result of many years experience in the field of mechanical power transmission. The gear couplings are distinguished by the compensation of axial, angular and parallel misalignment of the connected shaft and their mechanical flexibility. These couplings are used extensively paper machinery, cranes, metal rolling mills , plastic and rubber industry compressors , fan blowers and many other industries. These gear couplings is manufactured with crowned external teeth, consists of two hubs and two outer sleeves with internal spur teeth.

The outer sleeves and gear hubs are manufactured from carbon steel and hardened to the required degree. They are machined to fine tolerances for proper meshing of the gears as well as for inter- changeability.

Gear Coupling Feature
The gear coupling has hubs with multi crowned teeth at chamfering on teeth and flank teeth.

Crowned Flank

For making the tooth thickness greatest at the center of the tooth, the flanks of the teeth are crowned. This puts more teeth at the given teeth in contact for a given angle and assures larger contact area per tooth for higher torque requirements. The tooth loading takes place at the center where the tooth thickness is greatest. The crowned flank also provides optimum load distribution, accommodates all types of misalignment with minimum backlash and eliminate end-to-end tooth loading.

Crowned Chamfers

The faces of the teeth adjacent to the tips are chamfered to eliminate the interface with the sleeve tooth fillets. This allows the sleeves teeth to be in contact with the true involutes flank of the gear teeth thus assuring the freedom of misalignment. The heart of the gear couplings are the hub and a great tooth profile and superior design enables these coupling to operate satisfactorily under all operating conditions with long life and reliability.

Crowned Teeth
The tips of the teeth should be crowned. The crowned tip contacts the root of the internal gear teeth in the external sleeve, thus accurately piloting the sleeve with true concentric socket and ball action. This allows centering the sleeve physically to assure good physical dynamic balance and minimum diametric sleeve clearance under various misalignments and loading conditions.

Hubs
The teeth of the gear hubs are generated by involute system and are crowned in nature. The amount of backlash values and crowning are chosen to ensure the best result greater flexibility, smooth operations and torque transmissions.
Sleeves
The internal teeth of the sleeves are produced in gear shaper ensuring a correct profile. These teeth are generated by involute system. The coupling sleeves are joined together with high tensile strength and are fitted with bolts by using the gasket in between them.

O Rings
In order to stop the leakage of lubricant and entry of the dust particles O- rings are provided at the end of the coupling hubs. The O -rings can also withstand high degree of temperature of 120 ° C.

Seal Carriers
Seal carriers are provided in order facilitate replacement and inspection of O- rings without the disturbing the alignment.

 


When To Replace Your Power Tool Bearings

When we talk about the most integral parts that go into a power tool, bearings are one of them. Rotational and linear movement of your power tool depends on the condition and quality of the bearings. Bearings help all the moving parts to function properly and without bearings your power tool is as good as a dead duck.

WHY DO BEARINGS GO BAD?

The most common reason is the usual wear and tear that happens with time and use. There is always a chance of human error and accidental adversities but generally usual wear is the culprit.

HOW DO YOU KNOW WHEN BEARINGS HAVE GONE BAD?

There is an easy way to detect the signs of a damaged bearing. For starters, your power tool may generate a lot of heat and it may become completely unresponsive producing a mere whimper every time you try to start it. Another symptom is that characteristic sound of a damaged bearing that can be classified as a "screech". If you are able to hear that "screech" you should know right away that there is something wrong with the bearing.

That screeching sound is produced because of the lack of lubrication in the bearings. Bearings need some grease to reduce friction and work smoothly, so when that grease isn't there, dried up bearings produce that uncomfortable sound. Now most bearing sets are self contained so you can't grease them up. The only thing that works is replacing them with the new ones. If you try to re-lubricate the bearings, you will be putting your expensive power tool at risk.

ADDITIONAL SIGNS OF DAMAGED BEARINGS

Besides the aforementioned signs, when the bearings are damaged, your power tool has to work extremely hard to give its usual performance and that puts a lot of pressure on electric motor resulting in excessive amounts of heat. In some extreme but rare circumstances, it may even cause the electric motor to melt down completely. That's why when bearings go bad they usually take a few surrounding internal parts with them and that's why it's necessary to replace the bearings at your earliest to avoid further damage.

Sometimes bad bearings also cause your power tool to freeze and become unresponsive. That happens when the bearings fail completely to move. That means the electrical energy cannot be converted into mechanical energy which is the whole purpose of a power tool.

WHERE TO GET HIGH QUALITY REPLACEMENT BEARINGS?

It depends on the power tool and the brand and model you're using. If it belongs to well known brands like Panasonic or Milwaukee then you can get bearings easily as Milwaukee replacement parts and Panasonic replacement parts can be found easily on online shopping stores and portals. However, if your power tool is from the manufacturer that doesn't offer replacement parts then you might have to look for aftermarket parts.

 


The Importance of Coating Bearings

Thin dense chromium and XADC coatings can provide absolute adhesion and corrosion protection equal to 440 series stainless steel. This allows the use of metals that are less expensive, easier to machine, more resistant to fatigue, and longer-lived. These coatings can successfully be applied to ball, roller and linear bearings, brining them to Abex 9 classification. Dimensional stability is maintained with engineered deposits from .000050/.0002".

The nodular surface of the special coatings allows them to work against themselves, increasing wear and lubricity characteristics in roller and needle bearing applications and allowing them to be completely coated. The test indicates no negative effects on expected fatigue life. Bearing operating temperature may be reduced when the coatings are applied; the coatings work well on 52100, M-50 NIL, 440C, pH Stainless, 8620 and many other base materials. Surface hardness is increased to 78 Rc with the coatings and to 98 Rc with a special diamond coating.

Introduced in 1996, the coatings offer the industrial design and engineering community the opportunity to expand their options to enhance the performance of their equipment and tooling. With the addition of nano-diamond spheres to the coating, thin dense chromium technology is unique, but still allows for cost effectiveness. The special coatings enhance the durability of components used in a wide range of applications from plastic injection mold tooling to coating aerospace applications that require long life expectancy, extreme wear protection, low frictional characteristics and corrosion protection.

The XADC uses thin dense chromium coating solution as its base, but is infused with a synthetic diamond particulate, which is responsible for the extreme hardness quotient. Both coatings, at a microscopic level, provide a nodular (as opposed to flat) finish. Unlike traditional hard chrome, a thinner deposit of the coating does not inhibit the coatings' efficiency, and may prevent excessive edge build up.

The coatings are applied using the general principles of electroplating, but employing proprietary chemistry and proprietary fixturing methods/materials. This process is known as "cool": parts will see temperatures no higher than 160F. Lower temperatures means no risk of heat-induced damage (annealing, distortion, warping). Due to the prep procedures, the coatings bond mechanically and absolutely to the surface of the substrate.

Ball Bearings and cylindrical roller bearings are used in the shafts of gearboxes with power ratings of up to 27,000 kw. Tandem bearings are used for supporting the extremely high axial loads on the worm shafts. Bearings are very important, picking the coating that is going to extend their life and save you money is very important.

 


Effective Power Transmission Systems: The Cornerstone Of The Manufacturing Process

Power transmission systems form the backbone of nearly every industrial process. Assembly lines are driven by mechanical propulsion systems and they are the most common method for mass production of products, from automobiles to consumer goods. Liquids are moved in chemical processes by pumps that make gasoline, diesel, heating oil, and plastics and specialty chemicals. In the home, compressors can be found in the back of every refrigerator to run the refrigeration cycle that keeps our food fresh and in the air conditioners that cool our homes. Commercial appliances, farm equipment, and business equipment all use power transmission systems to run businesses and make our lives easier.

Power transmission systems break down into sub-systems, motors, drive systems, and bearings. In this article, we will examine each sub-system and analyze the choices and applications available for industry.

Motors That Drive Industry

Motors are ubiquitous in industry. Converting energy, be it electrical, steam, or compressed air, into work is the paradigm that runs manufacturing. They are the essential part of power transmission systems and are thus seen in every facet of life even outside of manufacturing.

Motors can be used to move air by driving fans. Fan blades can either be attached directly to the motor's shaft, or a drive system, typically a belt, can link the power generated to the fan blades. In order to compress gases, motors run compressors. Pressurized gases are the working fluid for refrigeration systems. Every piece of food that is kept cold and every air conditioner utilize a motor driven compressor. Pressurizing air is another widely used application for powering tools.

Motor driven pumps are the essential component when moving liquids. Centrifugal pumps use a motor to spin an impeller, which accelerates the movement of liquid. It then flows through a volute or diffuser to increase the liquid pressure. Positive displacement pumps pressurize liquids by trapping them in a chamber and then using a motor to apply a force. Imagine a piston in a cylinder, similar to a car engine.

Motors are found practically everywhere, from cars and refrigerators to industry and business.

Powering Mechanical Drive Systems

In a power transmission system, where the motors generate power, drive systems transfer that power to perform work. In a technical sense, drive systems convert a motor's cyclical power into linear motion. This is how a motor can spin in a circle, but provides the power to run a conveyor belt in a straight line.

The most simple drive system is a direct coupling. Take a spinning motor shaft and weld fan blades onto the end to create a fan to move air. Centrifugal pumps' impeller fans are also directly coupled, as well as sealed to contain liquid, to the drive shaft of the motor. While simple in design, direct coupling is limited to one device operated per motor, and the need to have many motors.

To transfer linear motion to a device that is not directly coupled to a motor, belt and pulley systems are often used. Belts have been in use since the 18th century in water-powered textile mills. The concept is that the motor turns a pulley with a belt attached that runs to a series of pulleys and bushings all attached to other equipment. In this way, one motor can drive multiple machines, as its power is transferred via the belt. Belt and pulley systems can also be synchronized, like the system in a car engine that uses power from the engine to run the alternator, air conditioner, and power steering.

Chain systems are another form of power transmission of linear motion. Often seen in conveyor belts, chain systems transfer a motor's power directly into work, such as moving an assembly line. Mass production facilities utilize this direct application of power as their means of production.

The Right Bearings To Maintain Operation

With all of these heavy metal components in motion, lubrication is needed to ensure smooth movement and power transmission as well as to reduce the load that friction will apply to materials. Bearings are used as the essential method for ensuring that metal does not grind against metal, destroying the machinery. They consist of a set of concentric rings with ball bearings and lubricating fluid set between them. Bearings will support a load in any direction depending on their configuration so they can be used in rotary and linear motion applications.

Linear motion bearings are commonly seen as rollers that will guide material along a specific path. Radial bearings support loads that run perpendicular to the axis of rotation and thrust bearings support loads that run parallel. A full set will support a motor shaft and prevent excessive vibration, friction, and material wear. Advanced bearings will include ports that allow a steady flow of fresh lubricant to enter the bearings and provide a cooling effect for high temperature applications. Ultimately, bearings can be custom made to even support non-uniform shapes.

When all of the components of a power transmission system are designed with integration in mind, work is accomplished more effectively with less down time. Motors that are properly supported by bearings and a drive system that transfers energy into work are the cornerstones of manufacturing processes.

 




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