Chain drives and gears
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Chain drive is a method for transmitting mechanical power over intermediate distances using a chain made of metal links and sprockets instead of pulleys, providing a flexible positive drive that requires lubrication to run smoothly and last a long time when properly maintained.
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coupling
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Belts and Rope Drives
P=250 kW
N1=300 rpm
D1=1.2 m
θ=π rad
β=22.5°
d=50 mm
m=1.3 kg/m
Pmax=2.2 kN
μ=0.3
Overhang=0.5 m
Shear stress=40 MPa
The document discusses various types of belt and rope drives used to transmit power between rotating shafts. It describes different belt materials, types of belts, components of belt drives, factors affecting power transmission, and applications. It also covers rope drives, materials used for ropes, advantages and disadvantages of rope drives, and considerations in selecting wire ropes
Chain drive system
Chain drive is a method of transmitting mechanical power from one place to another, often used to power vehicle wheels. It works by using a roller chain that passes over sprocket gears, with the gears' teeth meshing with the chain's links. Chains are classified into hoisting, conveyor, and power transmission chains. Power transmission chains are used in vehicles and machinery to convey power efficiently with little slippage between connected components. Chain drives require accurate installation and lubrication to function properly but can transmit power over variable distances compactly and with high efficiency.
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This document summarizes different types of gears classified based on their axis of rotation. It describes spur gears that have parallel axes for transferring power between parallel shafts. Helical gears are also discussed, which have twisted teeth oblique to the axis and produce thrust in the axial direction. Rack gears are explained as bars containing teeth that mesh with gears to convert rotary to linear motion. Bevel gears connect perpendicular shafts and can have straight or spiral teeth. Screw gears transmit power between non-parallel and non-intersecting shafts. Finally, worm gears are detailed as providing large reduction ratios using a threaded worm to drive a worm wheel.
Bearing
Bearings are used in machines to allow rotating parts to move freely while supporting loads. There are two main types of bearings: sliding contact/frictional bearings which operate on sliding friction; and rolling contact/anti-frictional bearings which have rolling elements like balls or rollers to reduce friction. Rolling contact bearings can carry heavier loads than sliding contact bearings and have lower friction, but are more complex and expensive to manufacture. Bearings are classified based on the type of load they support, such as radial loads, axial/thrust loads, or combined loads. Common bearing types include ball bearings, roller bearings, tapered roller bearings, and needle roller bearings.
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Belts and Rope Drives
P=250 kW
N1=300 rpm
D1=1.2 m
θ=π rad
β=22.5°
d=50 mm
m=1.3 kg/m
Pmax=2.2 kN
μ=0.3
Overhang=0.5 m
Shear stress=40 MPa
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Chain drive system
Chain drive is a method of transmitting mechanical power from one place to another, often used to power vehicle wheels. It works by using a roller chain that passes over sprocket gears, with the gears' teeth meshing with the chain's links. Chains are classified into hoisting, conveyor, and power transmission chains. Power transmission chains are used in vehicles and machinery to convey power efficiently with little slippage between connected components. Chain drives require accurate installation and lubrication to function properly but can transmit power over variable distances compactly and with high efficiency.
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This document summarizes different types of gears classified based on their axis of rotation. It describes spur gears that have parallel axes for transferring power between parallel shafts. Helical gears are also discussed, which have twisted teeth oblique to the axis and produce thrust in the axial direction. Rack gears are explained as bars containing teeth that mesh with gears to convert rotary to linear motion. Bevel gears connect perpendicular shafts and can have straight or spiral teeth. Screw gears transmit power between non-parallel and non-intersecting shafts. Finally, worm gears are detailed as providing large reduction ratios using a threaded worm to drive a worm wheel.
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This document discusses rope drives and the types of ropes used to transmit power over long distances. Fibre ropes made of materials like hemp and manila are suitable for transmitting moderate power over short distances up to 8 meters. Wire ropes are used for transmitting large amounts of power over longer distances up to 150 meters. Wire ropes can transmit power between pulleys that are further apart than fibre ropes and are made of strong materials like alloy steel. The document provides details on the design and selection of wire ropes, including considerations for stresses from axial loads, bending around pulleys, starting and stopping loads, and impact loads. An example problem is included to demonstrate the selection of a wire rope for a mine hoist.
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The document discusses various lathe operations including facing, turning, drilling, and taper turning. It provides step-by-step explanations of the processes with diagrams. Facing involves removing metal from the end of a workpiece to create a flat surface. Turning reduces the diameter of a rotating cylindrical workpiece. Drilling uses the lathe to drill holes before other internal operations. Taper turning creates a conical shape through various methods such as using a forming tool, setting over the tailstock, swiveling the compound rest, or a taper turning attachment.
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1. The document discusses the fundamentals and types of mechanisms in machine theory. It covers kinematics, dynamics, types of links, kinematic pairs, and classifications of kinematic pairs.
2. A kinematic chain is formed when kinematic pairs are coupled together to transmit motion. The relationships between the number of links, pairs, and joints in a kinematic chain are explained.
3. Common kinematic chains including four-bar chains, single slider-crank chains, and double slider-crank chains are described. Inversions of mechanisms by fixing different links are used to obtain different mechanisms.
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- Gear terminology like pitch circle, addendum, dedendum, and module.
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- Factors that affect gear performance like backlash, which is the play between meshing gear teeth that can cause imprecision.
Machine elements
This document discusses different machine elements used in machines. It describes power transmitting elements like shafts, gears, pulleys and cams that transmit power from one part of a machine to another. Holding elements like nuts, bolts and pins are used to hold machine parts together. Supporting elements like bearings and brackets provide structural support. Specific power transmitting elements discussed in more detail include shafts, gears, pulleys, cams and chains. Bearings are described as machine elements that support rotating or moving parts. Different types of bearings and couplings are also summarized.
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This document discusses riveted joints used in structural applications. It begins by describing common uses of riveted joints in pressure vessels, bridges, ships, airplanes, and other machinery. It then defines the components of a rivet, including the head and shank. Common rivet materials are also listed. The main types of riveted joints are described as lap joints and butt joints. Failure modes for riveted joints include bending, shearing of rivets, crushing of rivets or plates, rupture of plates by tension, and tearing or shearing of margins. An example calculation is provided to estimate the maximum load a sample lap joint can withstand. Design procedures for structural riveted joints are outlined
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Gears are mechanical devices used to transmit rotational motion and torque between two shafts. The document discusses several types of gears including spur gears, helical gears, bevel gears, hypoid gears, worm gears, rack and pinion gears, and planetary gears. It explains how each type of gear works and common uses for different gear types.
Types of gear drives
Gear drives transmit rotational motion between two shafts. Gears are mounted on parallel shafts and their teeth mesh to transfer rotation in opposite directions. Gear drives provide positive, efficient transmission of high torque and velocity over a constant ratio. While requiring lubrication and producing noise at high speeds, gear drives are used for low to high power transmission in machines like automobiles and manufacturing equipment. Common gear types include spur gears, helical gears, bevel gears, worm gears, and rack and pinion gears, which transmit motion between parallel, inclined, perpendicular, or rotary and linear shafts.
Types of key
Sunk keys
a) Rectangular sunk key
b) Square sunk key
c) Parallel sunk key
d) Gib-head key
e) Feather key
f) Woodruff key
2)Saddle keys
a)Flat saddle key
b) Hollow saddle key
3) Tangent keys
4) Round keys
5) Splines
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Kinematics of machine
LINK PAIR CHAIN
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MACHINE
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Pantograph,
Straight line mechanism and approximate straight line mechanism
Paucellier Mechanism,
Hart’s mechanism,
Watt,
Modified Scott-Russel,
Grasshoper,
Robert’s mechanism.
Hooke’s Joint, it’s analysis,
condition for equal speed of driven and driver shafts,
Double Hooks Joint, Quick return mechanisms,
Steering gear mechanisms
Davis and Ackermann Steering gear.
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Riveted joint (machine design & industrial drafting )
Riveted joint (machine design & industrial drafting )
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MILLING MACHINE PPT 5: INDEING AND INDEING METHODS BY POLAYYA CHINTADA
Indexing is the process of evenly dividing a circular workpiece into spaced divisions. Indexing heads, also called dividing heads, contain an indexing mechanism to accurately control rotation of the spindle and divide the workpiece. There are three types of indexing heads: plain, universal, and optical. The optical head provides the most precision and can measure angles to the second. Indexing methods include simple indexing using a plain head where the plate mounts directly to the spindle, and ratio indexing where the head contains a worm and wheel driven by a crank to divide the workpiece into the desired number of sections.
MILLING MACHINE PPT 4: MILLING CUTTERS BY POLAYYA CHINTADA
This document discusses different types of milling cutters used in metal cutting and machine tools. It describes plain milling cutters, side milling cutters, half side milling cutters, staggered teeth milling cutters, interlocking teeth milling cutters, end milling cutters including common type and two lipped end milling cutters. It also discusses face milling cutters, metal slitting saw milling cutters, angle milling cutters, double angle milling cutters, T-slot milling cutters, wood ruff key milling cutters and various form milling cutters. The document was prepared by Polayya Chintada to discuss milling cutters used in
MILLING MACHINE PPT3: MILLING OPERATIONS
This document discusses different types of milling operations including plain milling, face milling, angular milling, form milling, straddle milling, gang milling, end milling, and keyway milling. It provides details on each operation such as the cutters used, surfaces produced, and applications. The document is authored by Polayya Chintada who is an Assistant Professor and discusses these milling operations for a course on Metal Cutting and Machine Tools.
MILLING MACHINE PPT 2: PARTS AND CLASSIFICATION OF MILLING MACHINES
The document discusses the parts, types, and classifications of milling machines. It describes the main components of milling machines including the base, column, knee, saddle, table, overhanging arm, front brace, spindle, and arbor. It classifies milling machines as column and knee type, fixed bed type, planner type, and production type. Within these classifications, it provides details about horizontal milling machines, vertical milling machines, universal milling machines, omniversal milling machines, simplex milling machines, and other specific types of milling machines such as drum milling machines and tracer controlled milling machines.
MILLING MACHINE PPT 1: WORKING PRINCIPLE ,MILLING METHODS AND SPECIFICATIONS ...
Milling machines are used to remove materials from a workpiece via a revolving cutting tool. There are two types of milling: up-milling and down-milling. Up-milling involves cutting against the workpiece movement, resulting in varying cutting forces. Down-milling cuts in the same direction as workpiece movement, generating less heat and allowing for a better surface finish. Milling machines can cut flat, curved, or angled surfaces using multiple tooth cutters mounted on an arbor or spindle. They are suitable for machining surfaces, contours, threads, and other cross-sections.
LATHE OPERATIONS PPT POLAYYA CHINTADA
This document discusses lathe operations and provides details on various operations like facing, turning, knurling, parting off, drilling, boring, thread cutting, and taper turning. It explains the basic principles and methods for each operation. The objective of the course is to help students understand different types of lathes, lathe operations, work holders, tool holders, lathe attachments, and automatic lathes. The outcome is for students to be able to use lathe machines and understand the importance of lathe tools and lathes. [/SUMMARY]
LATHE ACCESSORIES PPT BY POLAYYA CHINTADA
The document discusses lathe accessories used in metal cutting and machine tools. It describes chucks (3-jaw, 4-jaw, collet, magnetic, hydraulic), face plates, angle plates, driving plates, lathe dogs, follower rests, steady rests, and mandrels. The accessories are used to properly hold and support workpieces and tools. Chucks clamp workpieces, face plates hold irregular shapes, dogs rotate workpieces, and rests support tubes or long workpieces during turning. Mandrels mount hollow workpieces. The document provides details on the construction and use of various lathe accessories.
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#Abstract:
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#Prerequisites:
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