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If There Is a Fastener There Will Be a Tool That Requires Access.

I get great satisfaction when working with my hands. When I do so I always ask why the item I am working on is as it is. One source of frustration I believe many have experienced it the lack of tool access. Sometimes n-1 fasteners are a breeze to access and the nth takes more time to remove than all the other combined. I don’t recall from my machine design class ever addressing this real world situation. I learned how to size bolts, bearings, and cross-sections but I don’t recall any mentio

JAG Engineering LLC

JAG Engineering LLC

 

MACHINE DESIGN :- 40 POSSIBLE QUESTIONS

1. What are the differences between true stress, engineering stress, proof stress. 2. What do you men by factor of safety and what is its significance 3. What do you mean by Young’s modulus, modulus of rigidity and bulk modulus. 4. What do you mean by resilience. 5. What is pure torsion and what do you mean by flexural igidity. 6. What is the difference between endurance limit stree and endurance strength. 7. What do you understand by efficiency of riveted joint. 8. What is caulkin

saurabhjain

saurabhjain

 

Over Engineered or Over Designed?

I recall many years ago first hearing the term Over Engineered. It rang a sour note but I had not given it much thought. I still hear this said today about older equipment. For instance the DC Generators at Pratt Institute in Brooklyn NY have been in operation for over 100 years. http://inspectapedia.com/heat/Steam_Systems_Pratt_Milster.php I had the opportunity a few years ago to visit my alma mater. To my surprise and delight the Chief Engineer who provided the tour of the facility to my class

JAG Engineering LLC

JAG Engineering LLC

 

5 tips to survive a Seminar successfully!

Seminars have always been an important aspect of education. It's an opportunity to either gain knowledge on an unknown topic or develop ideas regarding something you already know.It's a place where you meet highly skilled persons and get to know their recent researches.You should attend at least a couple of seminars annually to keep yourself updated about the advancements taking place in your field. I've seen many people who keep avoiding seminars, although interested, just because they have nev

Tania Alam

Tania Alam

 

BUE formation during machining

What is a BUE? BUEs are built-up edges formed due to the accumulation of work-piece material against the rake face of the tool. How are BUE formed? During machining, the upper layer of the work-piece metal experiences a large shear force as it comes in contact with the tool-tip and an amount of the metal gets welded to the tool-tip. This is due to work hardening of the metal layer. The metal adhered to the tool becomes so hard that it is difficult to remove.     Why a

Tania Alam

Tania Alam

 

Types of Kinematic pairs

When two links (or elements) in a machine are in contact with each other, they form a pair. When the relative motion between these two links is completely or partially constrained, then the links are said to form a kinematic pair.In simple words, a kinematic pair or simply a pair is a joint of two links having relative motion between them.    Kinematic pairs can be classified on the basis of:   1) Nature of contact between the pairing elements  (a) Lower pair – surface

Tania Alam

Tania Alam

 

Types of Hydraulic Turbines

Turbines are machines which convert fluid energy to mechanical energy. When the fluid used is water, they are called hydraulic turbines.  Hydraulic turbines may be classified on the basis of four characteristics :       On the basis of the type of energy at the turbine inlet Impulse turbine total head of the incoming fluid is converted in to a large velocity head at the exit of the supply nozzle ( entire available energy of the w

Tania Alam

Tania Alam

 

Advanced Polynomial Curve Fitting

Mechanics Corner     A Journal of Applied Mechanics & Mathematics by DrD, #33     © Machinery Dynamics Research, 2016 Advanced Polynomial Curve Fitting     The use of polynomials to fit engineering data is a common engineering practice. In school, we learn that "A data set consisting of n data points ((x_{i},y_{i}), i=1,2,3,…n) can be exactly fitted with a polynomial of degree n-1. Thus three data points can be fitted exactly with a quadratic expression, four data points ca

DrD

DrD

 

Braced Cantilever

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD, # 32     © Machinery Dynamics Research, LLC, 2015 Braced Cantilever Introduction     Anyone who has actually gotten into machine design is familiar with this difficulty. Consider the situation where a project is well advanced, many plans have been made, and it is all based on the assumption of the adequacy of one particular part. When you finally get to the detailed analysis of that part, the calculat

DrD

DrD

 

What is the name of this mechanism.

good morning Someone could tell me what the name of this mechanism or how can I find a way to design it. It is a shaft that moves in a straight line vertically and along the way makes a 180 ° worst shaft never leaves his line of action . these links you can see the operation of the mechanism     Thank you Imagenes del giro.docx

Daniel Barco

Daniel Barco

 

ODE Solution --- Fail!!

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD, # 31       Machinery Dynamics Research, 2016 ODE Solution --- Fail!!      Introduction     Digital computation has become a major tool for engineers, and it is a great benefit. It can also lead to many pitfalls for the unwary. This note is about the latter, a potential pitfall that many engineers risk on a daily basis, most of them with little awareness of the danger.     Early in the developme

DrD

DrD

 

Where is this?

Does anyone recognize where this video is shot? Is it a group of students at a school (what school?), or is it an industrial site (what company)? I am anxious for someone to locate this for me, please. DrD   Saurabh Jain, our host, has identified this location for me, and that is much appreciated. When I watched the video, I was aghast at all those nearly bare feet in a machine shop! I can appreciate that in Indian culture, the simple sandals are socially quite acceptable, bu

DrD

DrD

 

Did I Go to School to Make Copies?

I did not write the linked article. I should have since you will not learn this in school. When we finish 4 or more years of an ME education we are all wound up. We have been working at a pace which would kill us if tried it indefinitely. What shocked me when I entered industry was the trivia that engineers must be involved with. Perhaps like a soldier, you train to fight, but you don't do it 8-12/hr per day for 30 years. I don't know if the following article is accurate for small companies but

JAG Engineering LLC

JAG Engineering LLC

 

A Question for Readers

Many of you have asked me various questions, so now it is my turn. Let me lay a bit of background first, and then the questions.   I have had some conversations recently with JAG (one of the other writers here at ME Forums) regarding the choice of software for 3D modeling and analysis. JAG has made some excellent suggestions, specifically a cloud based program called Onshape. Unfortunately, for reasons that are unclear, my computer cannot run Onshape; I have worked with their help peop

DrD

DrD

 

Rule and equation

Hi guys, can someone here help me to understand this better, explain in a teoretical way to understand Chvorinov's Rule and Bernoulli`s equation? Not just in a simple way, but deeper, can someone here do that, or knows how?   Thanks in advance!!!!

Ajarn Basin

Ajarn Basin

 

Nobody Told Me This Was a Math Class

Since a lot of young people visit this forum I thought it could be of value repeat what I learned 40 years ago. I did learn the following from one of my professors not in the classroom but during a meeting with her as my adviser. I did not fully appreciate what she suggested though I did follow her advice and it was the correct thing for me. I was in a city community college (CC). The four year city colleges were somewhat prestigious. The CC prepared students to transfer within the cit
 

Economical Robotic Vacuum cleaner

Robotics brings together several very different engineering areas and skills. There are various types of robot such as humanoid robot, mobile robots, remotely operated vehicles, modern autonomous robots etc. This survey paper advocates the operation of a robotic car (remotely operated vehicle) that is controlled by a mobile phone (communicate on a large scale over a large distance even from different cities). The person makes a call to the mobile phone placed in the car. In the case of a call, i

Shahul Sgk

Shahul Sgk

 

The Dumbest Guy in the Room.

Over the years I have witnessed a particular mistake repeated. It is usually with an old product that has a problem, or the old product requiring a change or a feature added. The mistake manifests itself with everyone believing they carry the true operation and understanding in their heads. Aside from Scotty aboard the USS Enterprise, most should assume there is something they may not know. When a new product is being developed the team usually follows some development process with defined
 

DIY 3D Printer Kits From StuffMaker

3D printing technology is attracting every science and technology enthusiast whether it is a mechanical, civil, architecture, electrical, manufacturing or medical application. Everybody is interested in creating models, prototype using 3D printing technology. It’s not a technology but a 3D printing evolution. The pace at which this industry is growing and the novelty that 3D printing has introduced, it is predicted that additive manufacturing will affect almost all the fields of daily life inclu

Arpit.v

Arpit.v

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