What is Machine: Definition and 968 Discussions

A machine is a human-made device that uses power to apply forces and control movement to perform an action. Machines can be driven by animals and people, by natural forces such as wind and water, and by chemical, thermal, or electrical power, and include a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement. They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems.
Renaissance natural philosophers identified six simple machines which were the elementary devices that put a load into motion, and calculated the ratio of output force to input force, known today as mechanical advantage.Modern machines are complex systems that consist of structural elements, mechanisms and control components and include interfaces for convenient use. Examples include: a wide range of vehicles, such as automobiles, boats and airplanes; appliances in the home and office, including computers, building air handling and water handling systems; as well as farm machinery, machine tools and factory automation systems and robots.

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  1. S

    Free body diagram of atwood machine

    Homework Statement I need to find the forces on this modified atwood machine: http://imageshack.us/photo/my-images/36/atwood.jpg/ The Attempt at a Solution What I think: - On mass M there are two forces, Mg and -T. - On the mass above the spring there are two more forces, -2mg...
  2. L

    Atwood's Machine using Angular Momentum

    Hey everyone. I'm kind of stumped on this example from my textbook. It uses angular momentum to solve an Atwood's machine problem. Here is how the problem and the solution goes: My question is, why does the book use force of gravity as the force acting on the pulley instead of the...
  3. S

    What is the maximum height reached by the 2kg mass in a modified Atwood machine?

    Homework Statement Two masses, 5kg and 2kg on the two ends of an atwood machine (ie. over a pulley). Initially, both are 0.6m above ground. Find the maximum height the 2kg mass will reach when the system is released. Homework Equations The Attempt at a Solution Maximum height...
  4. ZapperZ

    Marvel of Technology: The LHC, Machine, And Experiments

    The Chicago Blues Fest is going on this weekend in Grant Park right in the heart of downtown Chicago. If you are attending this, or are in downtown Chicago this afternoon, a short walk from the Blues Fest up Columbus drive just north of the Chicago River, you can attend this...
  5. 6

    Flame Treatment Machine for Automotive Parts: Tips for Choosing the Right Burner

    Flame Treatment Machine, need help... I work for a automotive supplier company. I am needing to fabricate a Flame Treatment Machine to Flame Treat the Parts before applying a adhesive shim. The Flame Treatment Improves the Dynes of the parts for better adhersion of the shim. I am fabricating a...
  6. S

    Why are rotary lip seals and ball bearings used in lathe machine?

    The title says it all Why are rotary lip seals and ball bearings used in the input and output shafts of a lathe machine?
  7. J

    What is the Force at Pin E in a Frame and Machine Analysis?

    Homework Statement Find the force acting at pin E [PLAIN]http://img841.imageshack.us/img841/4983/piczt.png a = 53.0 mm, b = 212 mm, c = 318 mm, d = 106 mm, and e = 371 mm. A mass of 515kg acts through H. Homework Equations The Attempt at a Solution By finding the moment...
  8. D

    Solving Atwood Machine: m1 & m2 Reaching Floor & Ascending Height

    Homework Statement One mass, m1 = 215g, of an ideal Atwood machine rests on the floor 1.10m below the other mass, m2 = 255g. (a) If the masses are released from rest, how long does it take m2 to reach the floor? (b) How high will mass m1 ascend from the floor? Known variables: m1 = 215g...
  9. L

    Schools Would like to work with brain machine interface in grad school

    Hello, Next year I'll be graduating from a small liberal arts college (University of San Francisco) with a BS in Physics. By that time I'll have 2 years experience working for the Dept of Physiology at UC San Francisco. The experiments I've worked on have been in behavioral genetics, but I...
  10. C

    Ruby Goldberg Machine - Improvements/Ideas

    Hey there, We have a project to make a Ruby Goldberg Machine due in a month. Due to the complexity of the project we have started early. This would be my first time making something like this and I need help connecting and improving my ideas. The objective we have decided upon is to...
  11. K

    Design a CNC Mill Machine - Guidelines & Resources

    Hi guys. I want to design a cnc mill machine. I have to design it's structure (frame), the other things are taken care of. For this I need your guidelines like from where to start etc.. Any resources,links would also be helpful.
  12. 1

    Design and Build a Machine to Stop an Egg from Breaking

    In physics we have about a week to come with a design and build a machine to stop the egg from breaking. It will be launched from the third story We only can use the materials the teacher ( about 100 straws and a meter of tape) THATS ALL WE GET! The sraws bend a little but are not very...
  13. A

    How Does a Weighing Machine Measure True Weight?

    My book says that a weighing machine measures the normal reaction to us from the surface we are standing on... So, I basically have 2 doubts here: (1) In Resnick, Halliday and Walker 6th edition (chapter on Laws of Motion), weight is defined as the magnitude of the force required to body a body...
  14. M

    Simple/compound machine design

    Hey, i have a physics ISU this year where i need to make a machine, simple or compound, that can pick up a empty roll of tiolet paper and drop it into a small container, it doesn't need to be electrical because i can position the roll right by the machine, and the container is just behind it...
  15. V

    Solving a Delta Connected Induction Machine Homework Problem

    Homework Statement A \Delta connected induction machine is to start from a source of 480V, 60 Hz. The motor ratings are : 4 poles, \Delta connected, 480V, 60 Hz, X_{ls}\,=\,X_{lr}\,=\,4\,\Omega, X_m\,=\,50\,\Omega, R_s\,=\,0.25\,\Omega, R_r\,=\,0.4\,\Omega. Find the current in the...
  16. M

    Math Mathematics needed to be a researcher in machine learning?

    Hi everyone, My name is Marlon and I'm a maths major from New Zealand. Recently, I've been very interested in machine learning. The research and potential sounds very exciting to me and I would definitely love to learn more about the subject. So I have two questions and would be very...
  17. M

    Designing a Tornado Machine

    Hoping one will look nice in my new living room, I want one constructed about 7 feet high. I think I understand the basics of how these machines work, but I'm wanting to change something. Most tornado machines you see produce mini twisters that are shaped with parallel sides- to where the...
  18. T

    Hello guys,I'm working on a machine now and it's called DFIG

    Hello guys, I'm working on a machine now and it's called DFIG (Doubly-fed Induction Generator). It is connected to a power converter on the rotor only. My question is: how are you able in supersynchronous state to have a induction on the rotor. I know that you have an excitation current...
  19. F

    Solving Atwood's Machine: Find Accel & Time for 60 cm

    Homework Statement An Atwood’s Machine has a solid cylindrical pulley with a mass of 80 g and a radius of 10 cm. A 1.1 kg mass is hung on one side and a 1.05 kg mass on the other side. Find the acceleration of the two masses, and the time for them to travel a distance of 60 cm. 2. The attempt...
  20. S

    Connecting Thermocouples to a Spinning Workpiece: Tips and Tricks

    How to connect a wire to a workpiece which is spinning by turning machine ?
  21. S

    Temperature Measurement Turning Machine (HELP)

    I am going to use tool work thermocouple to measure the temperature but i am facing a problem. I know i can use steel strip to one of the wire. but how about the second wire? If my insert is Titanium Carbide. Is it ok if i using different material from the insert to connect to second wire ...
  22. G

    Could Tesla's Resonation Machine Really Shake Anything Apart?

    http://www.excludedmiddle.com/earthquake.htm all the links i come across seem to say the same thing. tesla invented a device that can oscillate specifically to the frequency of anything and shake it apart. and one day the device got stuck on and he had to smash it with a sledge hammer. i...
  23. V

    Electric machines & power electronics - PMAC machine connected in Y, 4 poles

    Homework Statement A PMAC machine is connected in Y and has 4 poles. I_F\,=\,27\,A and L_m\,=\,20\,mH. a) It is to operate at a torque of 35 Nm and at a speed of 4000 RPM. Calculate the necessary stator current I_S and voltage V_{S\,line-to-line} so that the losses are minimal. b) If the...
  24. PainterGuy

    Machine language program is the fastest?

    hello everyone,:wink: i read somewhere that machine language program is the fastest when compared to assembly language and high-level languages program. i don't get it. i think you can say machine language program is already in 'exe' form. but once assembly language program and high-level...
  25. G

    Archived Potential Energy and Conservation Of Energy Atwood's Machine

    The two masses in the Atwood's machine shown in Figure 8-23 areinitially at rest at the same height. After they are released, thelarge mass, m2, falls through a heighth and hits the floor, and the small mass,m1, rises through a height h. (a) Find the speed of the masses just beforem2 lands...
  26. D

    Atwoods machine and angular momentum

    so given atwood's machine, a pulley with mass M and radius R, a massless string connected to two blocks with masses m1 and m2 with m1 > m2 and the string does not slip. calculate the angular momentum of the system and use it to find the angular acceleration of the pulley and the linear...
  27. R

    Unlimited Energy: A Perfect Magnet-Powered Newton's Cradle in a Vacuum

    If we imagine a newtowns cradle now change it to be like the one from xmen without the strings, I know this was cgi but let's imagine it was placed in a perfect vacuum and was operated with permanent magnets that won't degrade. Would this reamain running forever after the inital energy input
  28. U

    Mechanic of Machine - belt drive system

    Mechanic of Machine -- belt drive system Homework Statement An induction motor shaft, runnnig at 1200 rpm, drives a workshop main shaft by a flat belt drive. the diamter of the pulley on the motor shaft is 40cm n the main shaft is 70cm. another pully of diameter 45cm drives a countershaft...
  29. G

    Atwood Machine + Torque - need a nudge

    Homework Statement Two weights, 75N (mass 1) & 125N (mass 2) are connected by a very light flexible cord that passes over a 70.0 N frictionless pulley of radius 0.200 m. The pulley is a solid uniform disk and is supported by a hook connected to the ceiling. What force does the ceiling exert...
  30. J

    Statics, Stress, and Machine design

    Homework Statement I have attached a copy of the assignment problem. I have been having serious trouble finding the value of the force P. I know the equations to use for part b and c but I need to know the force P to complete the rest of the problem.Homework Equations a) The problem tells me...
  31. F

    Atwood machine rope tension problem

    Homework Statement Smaller mass on an Atwood machine is 5.2 kg (m1). If the mass accelerates at 4.6 m/s2what is the mass of the object? What is the tension of the rope? Homework Equations a = g(m2-m1)/(m2+m1) The Attempt at a Solution I can't approach this questions, because we...
  32. M

    Atwood Machine, weight of the string

    1. In the experiment(using a Atwood machine), should the mass of the string be added to the total mass moved by the unbalanced force for better accuracy? Explain. I think the answer is no because the weight of the string is very small and when doing the calculations to find acceleration, one...
  33. C

    Starting My Project: A Hydrolic Spider/Walker Machine

    hey guys I've been thinking of starting a new project so i was looking for a forum that i might be able to get some help with it... this forum looks bit out of my leage but i didnt find any thing elce more low key lol... well my back ground is a mantance fitter and turner. and i have done a...
  34. B

    Poisson Distribution and slot machine

    Homework Statement A casino slot machine costs C dollars per play. On each play, it generates random variable X ~ Poisson with parameter λ < 1, and pays the player X! (X factorial) dollars. As a function of the fixed parameters λ and C, how much money would you expect to win (or lose) per turn...
  35. T

    Perpetual Motion Machine Question

    Say you had a spring with a magnet on top(stuck to the spring). And when the spring is pushed down, in which it will go back up, it will go near another magnet, pushing it down. Pushing it down makes it go back up. Would this work?
  36. W

    Troubleshooting X+y Turing Machine Example

    I am working out of Cutlands computability book and I am having trouble understanding the following example: "The function x+y is Turing-computable." Then the example lists the following specifications: q_1 1 B q_1 q_1 B R q_2 q_2 1 B q_3 q_2 B R q_2 I wanted to verify this worked...
  37. E

    Analyzing a 500V DC Machine for Vehicle Motion

    Homework Statement Considering a 500 V, 50 HP DC machine with the following parameters, Kv=1.8 Vs/rad, tau=50 mS and ra=0.07 ohms; Bm=0 p=1.2 kg/m^3, A=2.3 m^2, Cd=0.370, Crr=0.0106, Wveh=1000 kg, g=9.8 m/S^2 Assuming the machine is connect to a single quadrant converter with a switching...
  38. M

    What Forces are Involved in a Tennis Ball Pitching Machine Design?

    I'm trying to design a automatic tennis ball pitching machine for my senior design project. I will be using two spinning wheels as the launching mechanism. So far I've found the initial velocity after the ball leaves the two spinning wheels (v = 33.398 ft/s). This velocity was found by using...
  39. C

    Machine Architecture vs. Microarchitecture?

    Hi. I'm trying to decipher the differences between the machine architecture and microarchitecture. I believe Machine Architecture is: The ISA (such as x86) Von Neumann Model for Computing? and I believe the Micro Architecture is: Specific implementation of some arbitrary ISA...
  40. B

    Double Atwood Machine: relation between the contraints & the variables ?

    Double Atwood Machine: relation between the contraints & the variables ?! Hello. I am taking an analytical mechanics course & there's 2 "simple" equations relating the constraints to the variables. The problem is actually a class example. Here is it 1. The figure of the example is attached...
  41. R

    Machine Design Help - Calculate Load & Shaft Size

    I have a machine I want to build, the principle works on the basis that products enter a cylindrical sieve 900mm long, 2mm thick and 400mm dia, in the center is a shaft of 50mm dia, 1600mm long with 900 rpm. The shaft has paddles at a angle of 45deg to act as a conveyor by agitating the product...
  42. P

    Designing a Mealy State Machine for Input Sequences and Output Functions

    Electronics: Mealy State Machine Design I'm having trouble with designing the Mealy state machine below: Homework Statement A state machine is to have two inputs X and Y and an output Z. The output should stay at a constant value unless one of the input sequences occurs below: a)...
  43. S

    Thermodynamics imaginary heat machine?

    Homework Statement given the following diagram : http://www.freeimagehosting.net/uploads/… a)mention for every step if it is isothermal / adiabatic / else. does the system receive heat or emit heat. b)given this gas is ideal gas, sketch a diagram with respect to P and V c)calculate work done...
  44. G

    Aerospace Company Builds Flying Machine

    Hi guys... I am working at an Aerospace company... their hiring procedure is top-notch, coz` they hired me... a guy who has NO training and NO knowledge in the field (I also hate to fly!) So, the question is the following... we are building something that goes somewhere in a flying...
  45. X

    Help with converting machine language instruction into MIPS assembly instruction

    I think it's easy, but I don't get it. Given the machine language instruction 0x00221820. What MIPS assembly instruction does it represent? I know the solution. It's add $3, $1, $2 I just don't know how to get there. I know I have to convert the numbers into binary first. So you have...
  46. N

    Atwood Machine Tensional Value Problem HELP

    1. A pulley with mass Mp and a radius Rp is attached to the ceiling, in a gravity field of 9.81 m/s^2 and rotates with no friction about its pivot. Mass M2 is larger than mass m1. The quantities Tn and g are magnitudes. A) T3 is ... T1 + T2 B) T1 is ... m1g. C) The C.M. of Mp+m1+M2 does not...
  47. M

    Potential Energy of Modified Atwood Machine

    Homework Statement The two weights on the left have equal masses m and ar connected by a massless spring of force constant k. The weight on the right has mass 2m, and the pulley is massless and frictionless. The coordinate x is the extension of the spring from its equilibrium length; that...
  48. M

    A Time Machine may be on the way

    Hello, First of all, I’m just an average Joe asking about an article I read concerning a scientist who believes he may be able to invent the first time machine. By what I gather, if he’s able to get financing and build it, he may be able to send messages to himself back in time – obviously not...
  49. G

    Finding a Mass of a Block on an Atwood's Machine

    Homework Statement A 5.00-kg block (M) on a 30° incline is connected by a light string over a frictionless pulley to an unknown mass, m. The coefficient of kinetic friction between the block and the incline is 0.100. When the system is released from rest, mass m accelerates upward at 2.00...
  50. D

    Atwood Machine, two masses + two pulleys (w/ mass)

    Homework Statement An Atwood machine is constructed using two wheels (with the masses concentrated at the rims). The left wheel (m1) has a mass of 2.1 kg and radius 21.44 cm. The right wheel (m2) has a mass of 2.8 kg and radius 33.94 cm. The hanging mass on the left (m3) is 1.53 kg and on...
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