Category: Mechanical Engineering


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Objectified is a feature-length documentary about our complex relationship with manufactured objects and, by extension, the people who design them. It’s a look at the creativity at work behind everything from toothbrushes to tech gadgets. It’s about the designers who re-examine, re-evaluate and re-invent our manufactured environment on a daily basis. It’s about personal expression, identity, consumerism, and sustainability.

pedal powered tennis ball launcherHere is an amazingly innovative project where students have recycled a bicycle to produce a Tennis Throwing machine.

Both cleanly powered and built from recycled bicycles our pedal powered tennis ball launcher is a unique innovate or die entry. It allows players varying in skill levels to practice to be better at both tennis and cycling. The launcher is towed to the court on its built-in bicycle trailer. A bike is secured to it and functions to drive the device. Pedaling the cycle as one would on a trainer drives the two launcher wheels. The cyclist then aims and pulls the lever to launch balls to the hitter.

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Source: http://www.bmw.co.za/innovations. Shot in the Netherlands utilising the moving sculptures of world-renowned artist Theo Jansen, this commercial, entitled “Kinetic Sculptures” forms part of a broader campaign which serves to highlight BMW’s market leadership in the fields of technology and innovation.

He beleives the walls between art and engineering exist only in our minds

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compact discs

Learn how such a common commodity is precision engineered and mass produced in the hundreds of thousands

post clockThe clock tower is usually part of a church or municipal building such as a town hall, but many clock towers are free-standing.

The mechanism inside the tower is known as a turret clock. It often marks the hour (and sometimes segments of an hour) by sounding large bells or chimes, sometimes playing simple musical phrases or tunes.

So see what a city is made of, the team of national geographic has striped it of its skin and found out what it is that drives the world’s megacities.

This episode, Mumbai is the megacity in which 13 million people live. Discover and marvel at how such dense city manages to sleep soundly.

The airport opened for commercial operations in 1998, replacing Kai Tak, and is an important regional trans-shipment centre, passenger hub and gateway for destinations in Mainland China (with over 40 destinations) and the rest of Asia. Despite a relatively short history, Hong Kong International Airport has won seven Skytrax World Airport Awards in just ten years.

The amazing feet of raising a new airport on a separate island is dwarfed by cutting edge engineering.

To watch the following video please download veoh weplayer and refresh. Veoh is not a virus of trojan program


Introduction to Fluid Mechanics, Fox, Mcdonald, Pritchard

Introduction.to.fluid.mechanics.Fox.Mcdonald

One of the bestselling books in the field, Introduction to Fluid Mechanics continues to provide readers with a balanced and comprehensive approach to mastering critical concepts. The new seventh edition once again incorporates a proven problem-solving methodology that will help them develop an orderly plan to finding the right solution. It starts with basic equations, then clearly states assumptions, and finally, relates results to expected physical behavior. Many of the steps involved in analysis are simplified by using Excel.

This Also has a solution manual. Comment below and leave your email address to receive it for free.

Mechanical Engineering Handbook
Mechanical Engineering Handbook.

Whether you’re looking for details on materials, any aspect of mechanical design, manufacturing, thermal engineering, or engineering management, Mechanical Engineers’ Handbook, Second Edition, gives you fingertip access to the vital information you need to succeed.

Mechatronics

During the first year at university, i felt mechatronics (the Electronic Engineering) part of Mechanical Engineering was the toughest. Therefore i would like to help others with it.

The Java applet created by falstad will help you visualise electrical effects. Click here to browse for the circuit simulator


SolidWorks Tutorial, Flex Twisting to Draw Helical Gear tutorial

SolidWorks Tutorials by SolidProfessor Limit Mate


SolidWorks Tutorials by SolidProfessor Mate Xpert

SolidWorks Tutorials by SolidProfessor Rip Feature

PDMWorks Tutorial by SolidProfessor Checking in an Assembly

SolidWorks Tutorials by SolidProfessor Belts and Chains

Continue reading

CAD is a very essential and integral part of mechanical engineering. There are numerous challenges eliminated by using CAD packages. I use Solidworks but if you have any other packages that you prefer and can post some jpeg files on the website then that would be incredible.

P.S if you do not have solidworks e-drawings download it

here

Pencil Sharpener Assembly Drawing

Sharpener Assembly Drawing

Sharpener Assembly Drawing

Parts Assembly– Learn how to dimension and write tolerances

Vice Jaw- Learn dimensioning
Vice Jaw- Learn dimensioning

Assembly Drawing– Learn how to draw assembly drawings

ice Assembly- Learn how to Make Assembly Drawings and Bill of materials

Vice Assembly- Learn how to Make Assembly Drawings and Bill of materials

Download the solidworks e-drawings of all the above drawings

This is a peristaltic pump individual project that i was required to do in my first year at Imperial College. It tested various aspects of the design aspect of engineering including making solidworks CAD models, bearing size selection, design to manufacture and idea development.

I was provided with the what was required of the pump and i had to go and develop the idea whilst working along tight design restrictions. By design restrictions i mean the dimensions of the peristaltic pump (does not include the transmission drive system) were provided to me and all i had to do is create a solidworks model. Later on in the course i was given further instructions on the drive system of the pump. I was to design a transmission system (with appropriate gears), intermediate shaft, bearings (able to withstand design loads) and a housing for the gear box.

The pump was to be:

  1. Driven at 180 r.p.m
  2. Able to transfer enough water equivalent to a situation when the peristaltic pump was to be driven by hand would require a force of 10N to a handle of 150mm
  3. Provided a range of a.c motors which would deliver the necessary force as No. 2
  4. keep in mind during the design process that 200 units of the pump were to be produced

CALCULATIONS

N.B 180 rpm= 30 rev/sec

ω=6∏ rad/sec

———————————————————————————————————————

Torque= F.r= 10N x 150mm = 1.5 Nm

———————————————————————————————————————

N.B 1300 was the 240v a.c motor provided

Starting torque need to start the pump so that it does not stall= 1.5Nm/speed ratio =0.208Nm

———————————————————————————————————————

Gear selection

Criteria for bearings were:

  1. Low Price
  2. Durability
  3. Compact design
  4. Easily assembled into housing

where ω1/ω2= speed ratio and N(a)-(b) are the number of teeth on the gears. (i.e total of 4 gears used). I would only make sense to choose two pairs of identical gears i.e N(a)=N(c) e.t.c. refer to assembly drawings below of unsure.

I choose an arbitrary number of teeth to work with so i can calculate the number of teeth on the other pair of gears

Using two pairs of identical gears means the expression to calculate teeth number reduces to give the number of teeth on the second pair of gears:

Now i had to choose a suitable modulus of the gears (N.B all the gears will have to have the same MODULUS to MESH) to calculate the modulus look into a gear catalogue. Gears of small modulus is usually cheap but too small will give minute teeth and strength   of gears is compromised and too big will be expensive and have big teeth and therefore a bigger gearbox design (wasting money) but will hold large design loads (not really an issue here as load is not large).

I choose a 1.5 modulus gears.

———————————————————————————————————————

Gears A and B

Gears A and B

Maximum Force on gears = Max Torque/ Pitch Circle Diameter (PCD)

N.B Starting Torque = 0.208Nm and Torque Pump needs is 1.5Nm. It is important to get your head around this concept as what force a gear experiences will be determined here. The gear which is nearest to the Peristaltic Pump , the device that requires the torque of 1.5Nm to push the water. Therefore max force this gear will experience is 1.5/PCD.

Remember the gear connected to the pump is the 54 teeth on because u eventually downgrade the r.p.m from the standard motor (1300) to 180.  Look at the assembly drawings below to see what i am talking about.

Rendered Image

Rendered Image

Rendered Image

Assembly Drawing

Pump Assembly Drawing

Pump Assembly Drawing

DETAILED PART DRAWING

DETAILED BOTTOM HOUSING DRAWING

DETAILED BOTTOM HOUSING DRAWING

Other Useful Solidworks Videos

DOWNLOAD RENDERED IMAGES

DOWNLOAD SOLIDWORKS E-DRAWINGS (PUMP)

CRICKET BALL THROWING MACHINE


BRAINSTORMING ONE

Cricket Ball Throwing Machine

Cricket Ball Throwing Machine

BRAINSTORMING TWO

SLOT THROWER, SQUEZZER, CENTRIFUGAL THROWER

SLOT THROWER, SQUEZZER, CENTRIFUGAL THROWER

FINAL CONCEPT

BELT THROWER AND FINAL CONCEPT

BELT THROWER AND FINAL CONCEPT