That is hole that has been drilled, then had a thread 'tapped' into it so you can insert a machine screw or bolt.
Advantages of open loop control system?
What is shear modulus depends on?
Shear modulus, which is also often referred to as the modulus of rigidity or torsion modulus, is a measure of the rigid or stiff nature of different types of solid materials. It is derived from the material's ratio of its shear stress value to that of shear strain. Shear stress is a value of how much force is applied to a square area of a material, usually measured in pressure values of pascals. Strain is the amount that the material has deformed under stress divided by its original length. The shear modulus value is always a positive number and is expressed as an amount of force per unit area, which is generally recorded as metric gigapascals (GPa) because the values are more practical than English equivalents.
Do you need tools for welding?
Every welder ought to have many clamps! C-clamps, vice grips, wide mouth vice grips (snap clamps) and bar clamps; a nice dead blow (metal mallet covered in rubber,) wire brush to clean welding area before and after weld, good grinder to grind down a finished weld. Also setup blocks, but that's only in R&D and precision welding shops.
It is no news that the management of the University of Benin has finally released the long tarried for 2009 post ume results.However,what may seem to be news is the matters arising due to shock caused by the released results. Many applicants have expected to be admitted,only to realize that their efforts were castle in the air.It is a known fact that the released results brought joy and emotional tranquility to admitted candidates while it left non-admitted candidates to sorrow and emotionally traumatized.This tragedy seem not to be uncommon in the history of mankind.In fact,it is in tune with a line in William Shakespeare's Macbeth which reads "Fair is foul,Foul is fair",that is,in life what brings happiness to some set of persons will inversely cause others to sorrow. Through my findings,i realized that some non-admitted candidates are spreading fallacious rumours that Uniben is non-objective,prejudiced and Biased in Admission procedures.It is in the light of the above rumour that this article has decided to shed more light into the darkness which many non-admitted candidates and few admitted candidates have been roaming in. To start with,only candidates who scored above 49 both in the screening score and Pume+Ume were provisionally admitted into various departments in the university.However,there were rare candidates who scored below 49 but between 46-48 in the screening score but scored far above 50 in the Pume+Ume and were provisionally admitted too.It can therefore be inductively be concluded that only candidates who score not less than 50 both in the Screening score and post ume+Ume were considered for admission.So,you will be fooling yourselves about if you are not admitted following the fact that both score you earned is not up to the 50 50 criteria as stated above. Now,i know some persons would want to counter my arguements on the ground that, themselves or persons they know who met the above 50 50 criteria and were not admitted.Well,i must tell you that such unfortunate occurrence was only peculiar to candidates who applied for competitive courses such as Medicine,International Studies and Diplomacy,Law,Accounting,Pharmacy and Engineering.The simple reasons why such candidates were not admitted is simply because those competitive departments as enumerated above,have their own internal cut-off mark different from the general 50 50 for applicants.But,there is hope for such candidates who applied for the highlighted courses above.All you have to do is to be trust on God and check your results again towards the ending of January 2010 ,your application status must have changed to provisionally admitted(admission checking enabled!).But,you will definitely not be offered the courses you applied for,for instance,those who applied for Medicine may be offered courses under faculty of Agriculture,Law courses in Education or Social Sciences,Accounting in Education etc.The reason is because other vacant departments must be filled up with candidates like you,who falls in this category. Another question to which many have found on answer is "how Uniben arrived at the Pume+Ume score?".Well,it is very simple,the post ume+ume score is the JAMB score divided by 8 plus the Screening score divided by 2.To clarify all doubts,try to arrive at your pume+ume score using my empirically prescribed method. As for those who were provisionally admitted,i say a big congratulations to you,because you were among the few thousands admitted in relation to the many thousands of candidates who sat for the post ume.Many of you don't know the next thing to do.Am i right?You don't need to travel to Benin for now,just stay patiently at home till ending of March 2010 because that is when the school authority has scheduled you to resume.To see the school calendar goto http://uniben.edu.I also use this opportunity to say a big consolations to non-admitted candidates.May God almighty,reward and crown your efforts in year 2010. Finally,if you have any reasonable question to ask concerning anything stated or not stated in this article that concerns uniben 2009 post ume,you can always reach me with 07033098699.(NOTE:i don't reply text messages and don't tolerate mid-night calls except i schedule one with you because of the cruciality attached to your enquires).Once again,i welcome you all to Great Uniben come March next year! to all admitted and non-admitted candidates,i love you all.
What is open circuit potential which is used to determine corrosion of materials?
The open circuit (oc) potential is the potential of the working electrode relative to the reference electrode when no potential or current is being applied to the cell.
Why arc strike occur in arc welding?
because you're making a short-circuit that's why!, whaddayaknow uh?
More correctly as the label "arc welding" implies an arc is made by striking the metal to be welded with the electrode and this establishes the arc needed to generate the heat needed to melt the rod or filler metal and weld the parent metals together.
The problem comes about when the arc is established outside of the area to be welded and this strike leaves a very hard area (due to the momentary strike that creates a hard node) that with any stress can become the start point for a crack or small fracture that with continued stress will grow until complete failure of the part. There are many examples of this occurring where, e.g. a single arc strike near a welded seam on a ship has started a crack that then moved to the welded seam and then followed the seam down the side, under the keel and the ship broke in half.
So an arc strike occurs most commonly due to an accidental strike by a welder outside of the weld area where it will not be consumed by the weld process and if left will expose the part to potential failure at some time in the future.
"Arc strike" is commonly used to describe a mark left on the metal caused by the misplaced arc being started outside the weld area.
Welder competence will play a big part in the ability to strike an arc in the weld zone where intended but regardless of the reason for the "arc strike" the answer is to remove the arc strike to prevent possible part failure at some time in the future.
What is the difference between guides and jigs?
workpiece is fixed fast jigs and tools that lead to their position.
nLPM stands for Normal Liters per Minute. This is actually a mass flow rate because it describes the amount of gas that would have the indicated LPM volumetric flow rate AT 1 atmosphere pressure and 0 degrees C. The actual volumetric flow rate (LPM) at any other temperature or pressure condition must be adjusted according to the ratios of absolute temperatures and (inversely) absolute pressures.
What are the advantages and disadvantages of cam and follower?
Define various types of conveyors?
GUIDE TO DIFFERENT TYPES OF POWERED CONVEYORS
For more information about conveyor and other material handling equipment visit SJF.com. and check out the Tutorial Guides at the bottom of the page.
Power conveyor is an integral product in any conveyor system. Powered conveyor consists of both roller and belt type conveyors - each having a unique drive system and purpose. Most power conveyors consist of both drive sections as well as slave sections - the difference being that drive units can supply power to one or more slave units to create an entire run of conveyor. Combined with conveyor accessories and gravity conveyor, a power conveyor system can be run through an entire facility to transport finished or unfinished goods to workstatio0ns, docks or any other location needed.
Below are some sample images and cutaways of the different types of power conveyor as well as some of their common uses. If you have any questions about the best conveyor solution for your operation, please contact an SJF Material Handling at 320-485-4974 and speak to one of their conveyor professionals.
Accumulation Conveyor
ACCUMULATION CONVEYORAccumulation conveyor is typically used in conjunction with other conveyor types in a complete conveyor system. Accumulation conveyor consists of pop-up sensor rollers located in 'zones' which use a pressurized air system to hold your product in a queue until it receives a signal to release it to the next stage of operations. This can include moving products one at a time onto a weigh station, case sealer, sort system, palletizer, or any other work station.
There are several types of common accumulation conveyor, however two are more common than the others. Zero pressure accumulation conveyor will eliminate package collisions on the conveyor line by leaving gaps between each individual box, while minimum pressure accumulation conveyor will place the individual boxes next to each other with little back pressure.
Accumulation conveyor is one of the most vital links in any large conveyor system. Without it, your sortation system, packaging machine, scale or other automated machines will quickly become overloaded and will not function properly.
Belt Driven Conveyor
BELT DRIVEN LIVE ROLLER CONVEYORBelt driven live roller conveyor consists of load rollers, a drive belt, return rollers and an external motor. The load rollers make up the surface on which product is transported. The rollers move using a belt that is located underneath the load rollers which provides friction directly on the rollers and creates forward movement. The return rollers are used to keep the belt in place under the conveyor as well as to maintain tension on the belt at all times.
Belt driven live roller conveyor can be used in accumulation, induction, and merge systems where product sizes and weights tend to vary. It provides limited capabilities for inclined movement or packages of differing shapes.
Belt Over Roller Conveyor
BELT OVER ROLLER CONVEYORWith belt over roller conveyor, the belt can be either sliderbed supported or supported by return rollers located underneath the load rollers. Belt on roller conveyor is a fairly common type of powered conveyor and is what many people think of when they envision powered conveyor. Belt on roller conveyor is very useful for transporting light and medium weight loads between locations.
In addition to being a good general purpose powered conveyor, belt over roller is also a desired solution for inclines or declines. Powered belt over roller conveyor provides much control over the orientation and placement of loads, which can be good for bulky, irregularly shaped products. Because product orientation is easily controlled with belt over roller, it also makes a good conveyor to use in induction and sortation conveyor systems.
Lineshaft Conveyor
LINESHAFT CONVEYORLineshaft conveyors can be used used for both transporting and accumulating products. Lineshaft makes use of a drive shaft which runs the length of the underside of the conveyor, and drives the load rollers individually using belts. Since the rollers are individually powered, lineshaft conveyor can easily be used for accumulation operations where there is a minimum amount of backpressure on the product being transported.
The driveshaft is powered by a motor. Some configurations of lineshaft conveyor allow the conveyor to run both forwards or backwards depending on the situation desired. Because there are fewer moving parts, today's lineshaft conveyor is typically quieter than traditional live roller conveyors. The belts also assist in reducing noise by holding the rollers firmly in place inside the frames which results in less rattling.
Chain Driven Conveyor
CHAIN DRIVEN CONVEYORChain driven live roller conveyor (sometimes referred to as pallet conveyor) is typically used to transport heavy loads at controlled speeds. Chains drive sprockets on the load rollers which in turn drives a chain and the sprocket on the next roller, etc. These systems transmit the same amount of power to each roller thus insuring a smooth, even ride. These conveyors are very powerful and so are often found in foundries, manufacturing plants or other environments where a rugged conveyor solution is needed.
Chain Driven conveyor offers several advantages that other types typically do not or cannot. For instance, because there is no belt(s) chain driven conveyor can transport both hot and cold loads that could damage other conveyor types. Chain driven conveyor can also resist contamination by grease and other particulate matter better than other conveyor types. Chain driven live roller conveyor is also better able to tolerate uneven pallet bottoms or drums.
Trash Conveyor
TRASH CONVEYORTrash conveyor and regular sliderbed conveyor are two very similar products with one important difference. Trash conveyor has guard rails attached to the sides of its frame to prevent materials from falling off the conveyor belt into the work area. Return rollers keep tension on the conveyor belt keeping it taut.
Trash conveyor is used mainly to transport empty boxes, paper trash and other light-weight refuse to a disposal area, compactor or incinerator while keeping it out of the way of production areas. It can help to create a better organized work area that will allow your employees to perform their work efficiently and without hindrance. Since trash conveyor utilizes a sliderbed design, there are few moving parts to create noise. The sliderbed design of trash conveyor also makes it great for transporting materials on inclines and declines.
Sliderbed Conveyor
SLIDERBED CONVEYORSliderbed conveyor and trash conveyor are very similar products, but regular sliderbed conveyor does not usually have guard rails. Many capacities of sliderbed are available, but lighter weights are more common. Sliderbed conveyor uses return rollers to run a conveyor belt along a smooth bed,allowing for the smooth transportation of many different load types. If the load is something that can roll easily it's best to place it on a skid, pallet or even in a box.
Sliderbed can easily carry loose components and other materials that roller conveyors have a harder time transporting. Since sliderbed conveyor has few moving parts, it does not create much noise. The sliderbed conveyor design also makes it useful for transporting loads on inclines and declines. Typical sliderbed applications include inspection, transportation and assembly line operations.
As you can see - there are several types of power conveyor. These can all be mixed and matched within a complete conveyor system. Call an SJF solutions specialist if you have any additional questions about either powered or gravity conveyors & conveyor systems at 320-485-4974State the excessive vibration should not be allowed to continue?
Excessive vibrations lead to the following effects.
1) axial alignment in rotating machines
2) weakening of foundation
3) key or coupling failure
4) shaft failure
5) excessive noise
In what class lever is the resistance arm always longer than the force arm?
The class 3 lever always has a longer resistance arm than the force arm. This is because the distance from the Fulcrum to the load/resistance is always going to be further that the fulcrum to where the effort/force is applied. If you look at a diagram of a 3rd class lever, you will be able to see why this is.
What is meant by 7h in theard cutting?
"7H" in thread cutting refers to the thread pitch or the distance between each thread. It indicates that there are 7 threads per inch in the thread being cut. This measurement is crucial for creating threads that match the corresponding nut or bolt.
Is an impulse turbine makes use of draft tube?
No, an impulse turbine does not make use of a draft tube. In impulse turbines, the water is directed through nozzles to create high-velocity jets that strike the turbine blades, causing them to spin. Since the pressure is atmospheric at the exit of the turbine, a draft tube is not required to recover pressure or energy, as it is in reaction turbines.
What is initial tension in belt drives?
Initial tension force Fi is needed to counteract the centrifugal force Fc on the belt and thus keep the belt on the pulley. Fi essentially allows the belt to go around the pulley.
What different between hot molding cold molding?
Cold molding is the process of curing laminates such as fiberglass and carbon fiber at normal temperatures. Hot molding I when the laminate are cured in an oven or autoclave.
What is the difference of a point target and an area target?
Point target is when you are trying to hit a specific point. The area target is when you land within the vicinity of the target.
What are the Metric thread sizes?
Check in the Machinery's Handbook 17'th edition on page 1191 through 1193 for a description of all the metric threads as agreed to by the international congress for thread standardization at zurich in 1898.
Wilson Welded Steel is a type of steel construction method that involves welding together steel components to create a strong and durable structure. It is commonly used in the construction of buildings, bridges, and other infrastructure projects. Wilson Welded Steel provides excellent strength and flexibility, making it a popular choice for many applications.