What is Machine design: Definition and 39 Discussions

Machine Design (ISSN 0024-9114) is an American trade magazine and Web site serving the OEM engineering market. Its print issues reach qualified design engineers and engineering managers twice a month.
Key technologies covered include computer-aided design and manufacturing (CAD/CAM), electrical and electronics, fastening and joining, fluid power, manufacturing, engineered materials, mechanical engineering, and motion control.
Today, Machine Design is owned by Informa, and has editorial offices based in New York, New York and Cleveland, Ohio, USA.

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  1. D

    Processing plastic for recycling

    [Mentor Note: link to OP's blog website deleted] I need to learn where to find someone who will work with me to design and build machines for processing various plastic items. The end result will be granulated plastic, but the journey there will be different according to the physical and...
  2. Anachronist

    Minimizing the friction of the end of a lever against the top of a moving piston

    I'm trying to design a simple mechanism in CAD and got stuck on this problem. Consider a lever (blue shape) that pivots at one end (blue circle). The other end rests on a piston (pink rectangle). In my application the lever is pushing the piston (the lever pushes through the full travel of a...
  3. KingoftheChaosEmpire

    "Rigid airship" using low density hydrogen (LDH) inflation

    I know now that making a full on vacuum airship is unfeasible for it's compressive properties. So why not just make a rigid airship that is evacuated enough that the hydrogen is no longer significantly dangerous to it's surroundings, using say 25-30% density of neutral hydrogen? What's the...
  4. A

    Engineering Why are the radial and the axial stress in a rotating thin ring null?

    Greetings, while studying the stress in the rotating thing ring and find out the last equation that says I would like to understand why? Thank you!
  5. hackerbot4545

    Studying Successful Study Strategies for Machine Design and Shigley's ME Design Book

    People who have passed Machine Design course & followed Shigley's mechanical engineering design book how did you study for exams? Please provide some study strategies that have worked well for you. So I have Machine Design course for this semester & I find it really tough.Our professor is...
  6. G

    Inertia units for a synchronous machine

    Hello everyone, I'm sorry if this is not the right sub-forum to post this, but this doubt has been haunting me for a while. I've got some rotatory machine -let's say, generic synchronous machine-. Turns out there are typical values for [kg m^2] (inertia) in the 2-10 range; the software I'm...
  7. T

    Automotive Factors affecting compression spring oscillations

    Hi all, I'm studying the compression spring design issue that occurred in a machine design application. As illustrated below, spring is bouncing or oscillating after impact to a stopping surface (1 -> 2 -> 3 -> 4) and eventually stop after few bounces. Ideal case for this application is to...
  8. T

    Calculate resultant force of a linear mechanism

    Hi all, I'm currently designing a linear to linear transform mechanism (wedge cam design). Would like to check how much force required to push/ slide the roller down. To ease calculation, i have include some assumption: F2 = 1kg @ maximum compressed angle = 20degree F1 required = ? and how...
  9. T

    Calculate the required torque for a cam design

    Hi all, I'm currently designing a cam mechanism. Would like to check how much motor rated torque required for the following design of snail cam ? To ease calculation, i have include some assumed factor as below. Two extreme condition (rotation degree) to compare. What is the motor rated...
  10. H

    Misc. Project: Single Shaft Shredder

    Summary: Single shaft copper shredder I design a rotor of a shredder, but i need to find a motor for the rotor of the shredder. My questions are: 1. What is the best rpm for a copper shredder ( what kind of effects wil the shredder have on high rpm 1200-3000, lower rpm 300-1200 ) 2. what...
  11. N

    Mechanism with a linear actuator

    Designing a machine. For it to work properly there would need to be a mechanism that connects the linear actuator to the stand that would allow for the actuator to move horizontally relatively freely with applied forces at the bottom, when there is simultaneously a downward applied force by the...
  12. M

    Engineering Books about machine design

    Hi. I have a problem and I will be so grateful if someone can help me with this. I would like to know are there books that are similar to P.Orlov: Fundamentals of machine design 1,2 and 3. The book should include pictures of what is wrong and better solution of certain design. Thank you in...
  13. EastWindBreaks

    Which force creates the torque?

    Homework Statement Homework EquationsThe Attempt at a Solution F12 is just an internal force caused by the joint 1 right? how can an internal force cause a torque?
  14. EastWindBreaks

    Minimum number of teeth given the gear train ratio?

    Homework Statement Homework EquationsThe Attempt at a Solution for this class, we were not taught with contact ratio equations, nor the pressure angle is given, so for this type of problems, do we just assume that minimum number of teeth on a pinion will be 12? 3 integer factors of 180 can...
  15. EastWindBreaks

    Simple Gear Train: Pitch Circle Diameter and Typo in Homework

    Homework Statement Homework EquationsThe Attempt at a Solution if you do 38*25/pi , you would get 302.394 for the exact pitch circle diameter, similarly, exact d2 should be 907.183 mm, is it a typo? or did I miss something?
  16. C

    I Solve Mystery of Phi-Based Equation: Help Colin

    If you know phi it is about 1.618...=2cos36. The equations when x=phi which is equal to 0 is x^2-x-1=0. I took the first derivative squared and the second derivative cubed. The equation with x=phi is: [2x-1]^2+2^3=13 Check for yourself, if you fill in phi you get 13. Anyway, I do not know what...
  17. Sanchayan Ghosh

    How to further metrology study from machine design approach?

    Hello, I have metrology in my 4 semester in Bachelor's of Engineering in Mechanical Engineering. However, the books that we get (Engineering Metrology, R.K Jain,) give only a brief principle of how the instruments work. I want to further my study of this subject with an intention to design...
  18. hdp12

    Designing a Mechanism to Cut Aluminum Bar: Help Needed!

    Hi there So we have a group design project in my mechanical systems 2 class and it basically goes as follows: design a mechanism to cut a half inch aluminum bar in half using a standard hacksaw blade and 4 AA batteries. You have to use a motor w/ input > 5000 rpm for the 'main' component we...
  19. marellasunny

    500 kg Solar CSP reflector dish mechanism problem

    I am currently re-fabricating solar concentrator dishes to allow for automatic tracking of the sun during the day and month. The industry term for these dishes is 'CSP' (Concentrated Solar Power). Task at hand: The CSP parabolic dishes are currently manually adjusted to the position of the sun...
  20. ramzerimar

    Is Machine Design important for Aerospace Engineering?

    I'm a Mechanical Engineering student intending to pursue a Master's Degree in Aeronautical Engineering after college, and Machine Design is one of the disciplines I'm going to take next year. I understand the importance of various topics in mechanical engineering to an aircraft project (topics...
  21. T

    Machine elements stress concentration

    Homework Statement A flat part with constant thickness b is loaded in tension as shown. The height changes from 50 to 87 mm with a radius r = 4.0 mm. Find how much lower a load can be transmitted through the bar if the height increases from 50 to 100 mm and the radius increases from 4.0 to 10...
  22. T

    Machine elements - deflection and stress problem

    Homework Statement Homework Equations δ = Pl/AE σ = P/A The Attempt at a Solution I had calculated the deformation for both the steel and aluminum, and added them together to give me δ = 0.481 mm, which is incorrect. I also thought I could simply plug in the force P = 200kN and the...
  23. H

    I am ready to make a mechanical drawing but have issues

    One question is, I need a rod that both has grooved bearing tightly fit and a linear bearing on the same rod with no slop. Is this possible? What is a "press fit" tolerance? If I have a 0.5 hole, what size rod will be press fit? What size will locate without pressing? Boy I wish I had an...
  24. A

    Torque calculation of an vehicle

    hi, i have 8000 lb machine it has 4 wheels (just like car), i want it to move on 2 ft/sec speed on cast iron wheels with steel track at flat surface. radius of every wheel in 5 inch. what will be the torque required to move this machine?? and what will be the torque on each wheel?? i want to...
  25. S

    Need some reference books on machine design

    Dear all, I am following Shigley's Mechanical engineering design as a textbook for my course of machine design.But i would be very thankful if anyone gives me some references books of machine design in pdf format containing more and more problems.It will be helpful also if you can provide any...
  26. M

    Machine Design - How To Determine Motor HP Etc.

    I am planning a build on a simple 4-wheel-drive cart for hauling equipment for my business up/down yards with grade. 4 wheel cart will have weight capacity 1500 lb with potential of crossing up to 35 degree slope (slow RPM/high torque/motor brake necesary.) This will implement a 110V AC...
  27. M

    Designing Moore Machine: Tips & Troubleshooting

    Hopefully this post isn't too long, I am going to try to give you as much relevant information as possible so you can answer this easily. For a class project, I am required to design a Moore Machine based on a problem that we were given. I have already done this with a Mealy Machine, but I am...
  28. 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.
  29. 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...
  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. 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...
  32. P

    Mealy State Machine Design

    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)...
  33. M

    Machine design software/services

    Hello..sorry if this has been covered elswhere... I am a complete noob. I'm trying to find out how to develope a robotic arm or similar machine to cut 3 dimensional objects. Are there software programs that would create mechanical solutions based on a set of known results needed?
  34. R

    Good books on machine design and heat transfer

    Hi Tell me some good books on machine design and heat transfer. What about Machine design by Norton?
  35. R

    Machine Design Textbook problem

    If anyone could walk me through any of these or provide any help I'd appreciate it. Thanks I owe you one. Homework Statement Homework Equations The Attempt at a Solution
  36. E

    Moore State Machine Design

    Homework Statement Can someone check my work? [...] Receiving DATA in binary. The string length of each word is unknown. You are told that each word, demarcated by SYNC signals, is a two's complement number. Your task is to develop a synchronous sequential machine which examines the...
  37. M

    Launcher machine design (Need Help)

    Hi all, I'm going to design a ball launcher machine, but I've no idea where to start from.. this is the ball type: http://en.wikipedia.org/wiki/Sepak_Takraw how do i judge the power and rpm required for the motor?? as i know, there is a initial velocity required for the roller, so the...
  38. R

    State Machine Design for Repeating Sequence: 0,2,4,6,1,3,5,7 with 4 Bit Counter

    Homework Statement Design a state machine that repeatedly goes through the following sequence: three repeats of 0,2,4,6 followed by 2 repeats of 1,3,5,7. An observer watching the machine should see the states over and over: 0,2,4,6,0,2,4,6,0,2,4,6,1,3,5,7,1,3,5,7... The Attempt at a...
  39. D

    Help on mealy machine design

    I'm given a state diagram and I'm suppose to only use JK FFs (no gates) and an EPROM to implement the state diagram. How do I do this? I have no clue how the eprom and ff will hook up together. If I can figure that out i would have no problem on the eprom programming part. ASAP please...
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