Mechanical engineering

Screw jack   Points :  Screw jack, Definition, Construction, Working, Mechanical Advantage Definition  Screw jack is a simple machine generally used to lift automobiles.   Construction • A long screw rod passing through a threaded block ‘B’, having pitch ‘h’. • A handle ‘H’ to turn the threaded block. Working   When an effort ‘P’ applied on the handle ‘H of radius ‘d, the handle moves in a circle. When effort completes one revolution it covers a distance equal to 2p d and load is raised to a height ‘h’.   Mechanical Advantage Output = Input Wh = Px 2πd W/P = 2π d/h M.A. = 2π d/h Mechanical Advantage = Distance through which the effort is moved/Height through which the load is raised

Hydraulic Machines   Points :  Hydraulic Machines   The hydraulic machines, transmitted forces from point to point through a liquid; Most hydraulic machines use some sort of incompressible fluid, a fluid that is at its maximum density.  Oil is the most commonly used in compressible fluid for hydraulic machines. In a simple hydraulic system, when a piston pushes down on the oil, the oil transmits all of the original force to another piston, which is driven up. A hydraulic pump creates the pressure that moves the pistons. There are number of machines working on the principle of hydrostatics and hydraulics, but the following are in common use: (i) Hydraulic press (ii) Hydraulic accumulator (iii) Hydraulic intensifier (iv) Hydraulic crane. (v) Hydraulic lift

Lathe Machine Cutting Oils   Points :  Lathe Machine Cutting Oils, Uses of Cutting Oil   The principal function of cutting oil is to cool the cutter bit with the job. The name “coolant” is frequently certain to oil.  Cutter bit will last longer with will be able of endure better speeds with no overheating as a cutting oil is use. Cutting oil too facilitate lubricate cutter bits, improve the finish of work-piece, guard besides rusting, with washes away chips as of cutting area.   Uses of Cutting Oil   In manufacture process, practice is to flood work-piece with cutter bit by cutting oil in order to take the full advantage of its use. For effectual cooling, it is main that oil be directed at exact point of cutter bit contact. A large stream at low velocity is prefer to a small stream at elevated velocity. In miniature shops where pump tools is not available, cutting oils are use only for finishing and slight operations. It is common practice in this c...

Difference between Turret Lathe and Engine Lathe   Points :  Difference between Turret Lathe and Engine Lathe, Turret Lathe vs Engine Lathe, comparison Turret Lathe and Engine Lathe Difference between Turret Lathe and Engine Lathe Turret Lathe Engine Lathe 1. Tailstock of a turret lathe has of a turret. It resemble a big six-sided nut with can carry six tools for rotating a job. Tailstock of an engine lathe can hold just one tool of limited size. 2. Turret lathes are planned to act as production machines. Engine lathe is planned to machine various types of jobs, within limits. 3. One time setting is over you must not change tools. You can change tools as per your requirement. 4. Proper for batch or mass production of easy machine operations. Accuracy of work depends on operator. 5. Machine price is high. You can change any number of tool through machining. 6. Setting for a exacting work takes time. Proper for new and complicated precision work. 7. T...

Lathe Accessories and Attachments   Points :  Enlist Lathe Accessories and Attachments,  Lathe Accessories  Several lathe accessories and attachments are accessible to amplify the adaptability of the lathe and the range of work, which can be machined.   Major accessories of Lathe machine are as below: Lathe centers (dead center-live center-revolving center) Lathe drill holders (sleeves) Lathe tool holders Lathe mandrels Carriage stops Follower rest Lathe collets Drive plate Steady rest Face plate Lathe dogs Tool post Chucks Lathe Attachments  Attachment is a mechanism use in link by a machine in classifies to give a order range or improved excellence of work. Major attachments of Lathe machine are as under: Relieving attachment Grinding attachment Milling attachment Collect attachment Boring attachment Taper attachment

Difference between Capstan Lathe and Turret Lathe   Points :  Difference between Capstan Lathe and Turret Lathe, comparison of Capstan Lathe and Turret Lathe Difference between Capstan Lathe and Turret Lathe Capstan Lathe Turret Lathe 1. Capstan lathe is limited to the manufacture of work from bar fed during the empty spindle held in a collect and the standard machines contain a condition for fixing a jaw chuck to the spindle nose thus that bars, castings and forging might be held. Spindle nose of the this machine is threaded outwardly for screwing faceplate force plate, lathe chuck or any other work holding device proper to the job stock. Inside hole is tapered to get the lathe center and proper collect for bar holding. 2. Tailstock does not give for center support of bar stock and rising of shank tools. Tail stock hold up is not required as short piece bar stock is use for work production. Tailstock is moreover give for center hold up of the bar stock ...

Lathe Machine   Points :  Lathe Machine, Definition   Lathe machine is a power driven regular machine tool used to make cylindrical conical and flat surfaces by a sharp edge single point tool which is fed next to a turning work piece together held in the holding devices. Taper turning, straight turning, facing drilling, reaming boring, thread cutting. Forming and knurling are several of the familiar operations perform on a lathe machine.