What is Rotary: Definition and 90 Discussions

Rotary International is an international service organization whose stated purpose is to bring together business and professional leaders in order to provide humanitarian service and to advance goodwill and peace around the world. It is a non-political and non-religious organization open to all. There are over 35,000 member clubs worldwide, with a membership of 1.2 million individuals, known as Rotarians.

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  1. C

    Rotary Vane Engines: Advantages & Disadvantages

    are the 'vanes' of a rotary vane engine a major disadvantage? granted that the vanes would be under considerable stress, but is it so much larger than the stress on connecting rod in reciprocating engines? and is sliding friction on sides very high compared to pistons? also, is sealing a major...
  2. G

    Rotary Seal Ideas for PVC Pressure Housings Underwater

    Hey guys, So I need some ideas on how to best make some rotary seals (or a good alternative) for a school project I'm working on (which has a very tight budget). I'm creating some small PVC pressure vessels to put some medium sized RC servos in, and I need to run the servo's drive shaft (or...
  3. T

    Building a rotary piston engine

    This project is a basic 6 inch rotary piston engine. The rotary engine project is to build a external combustion chamber that will redirect the expanding heat into a rotor housing and turn a rotor with a single piston vane 340 degrees to the exhaust port. The basic piston,rod and crank...
  4. S

    How an object in translatory motion comes to rotary motion

    In a car race two motar vehicles are moving with very high speed , they have collided got coneected each other and started rotating together . Becuase they are in motion according to Newtons first law they are continued with motion, but how did they got rotary motion ?
  5. 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?
  6. P

    Rotary Swivel Assembly: Effects of Torque and Centrifugal Force

    Hello, I'm designing for a rotating swivel assembly that will be used for a high pressure cutting system. The rotary swivel is set for an allowable 2800 bar of pressure but has to rotate at 300 RPM while allowing a pressure of 12-15,000 psi pass through it. My question consists of two...
  7. M

    Rotary Encoder Pulses to DC voltage

    Does anybody know a good way to take the pulses from a rotary encoder and turn them into a DC voltage that would go up for clockwise turning and down for counterclockwise turning? I have the A and B pulses from the encoder, and that's about it as of yet. I also have these chips...
  8. S

    Determining Maximum Angular Velocity and Slip Time for Object on Turntable

    Homework Statement An object is placed on a turntable with a radius of 21.5 cm. The object's mass is 67.5 g. The coefficient of static friction between the two is .32. It asks to find the maximum angular velocity the object can have while remaining stationary relative to the turntable in...
  9. F

    Is this powerful rotary engine the future of small-scale power machinery?

    Powerful rotary engine? This is a powerful rotary internal combustion engine. When rotor round one time, engine work six times.My mechanical design aim was to create a power for UAV,MAV, robotics, mini-generators; engine size is very small, can be forged or EDM etching method of mass...
  10. E

    Inventor Discusses Rotary Machine with Eccentric Piston

    Hi, I am industrial automation engineer,I am 52 years old and I am from Romania. I would love to talk with you about "ROTARY MACHINE WITH ECCENTRIC PISTON" ,I like to say:"rotary piston" I asked the name "Rotary Piston" but the Patent Office has given the name:"ROTARY MACHINE WITH ECCENTRIC...
  11. B

    Estimating Rotary Blade Distance for Jet Turbine Compression

    As an example what is the estimated distance between each blade of a Jet Turbine blade and how far would each rotary blade be from the other to compress the air within the turbine housing? My accomplishment would be to make a miniture sized electirc turbine, which i have made when i was 13...
  12. G

    Removing Oil from Rotary Oil Pumps: Effects Explained

    Hello everyone, i had one doubt in my mind regarding Rotary oil pump. The Question is what would happen if we remove oil from the Rotary oil pump. What would be its effects? Please Reply Regards Gagan Sharma :confused:
  13. L

    Is a 6-Position Rotary Switch the Solution for Shorting Multiple Contacts?

    Hi, I'm looking for a 6 pos, 2Amps, mechanical rotary switch that with every turn will short another contact to all of the other contacts that came before... For example, if it's on position 3, legs 1, 2 and 3 will be shorthand all together. Thanks.
  14. Y

    Calculating Minimum Angle for a Rotary Encoder on a Rotary Inverted Pendulum

    [b]1. Homework Statement I am a student and am about to start my first year mechatronics shortly..i have been asked to research a few things on rotary encoders (incremental) and was wondering if one could help me understand how to calculate the smallest possible angle that can be measured by a...
  15. M

    Mechanical: Intermittent Rotary Motion

    I'm trying to virtually simulate a certain mechanical movement (#88) respect to Intermittent Rotary Motion. This is from the book '507 Mechanical Movements' written about 150 years ago. An image of the setup is attached. The description goes like this: Continuous rotary converted into...
  16. J

    Precise linear motion output from rotary input

    Hi, I need to get a precise linear oscillatory motion from a rotary input? Its for a compact carving tool. Any ideas on how to control the displacement? Thnks
  17. T

    Exploring the Benefits of a Rotary Anode in X-Ray Tubes

    I am planning to undertake the construction of an x-ray tube as a personal project with a friend of mine and I was wondering what are the advantages of a rotary anode? I'm having no trouble finding information on their construction, but have yet to run across the reasons for using one in the...
  18. Z

    How to Transfer Intermittent Rotary Motion to a Continuously Running Flywheel?

    I have intermittent rotary motion that I want to send to a continually running flywheel. The flywheel in mounted to one shaft, the intermittent rotary motion comes from a wheel or gear (driver) that is mounted to another shaft. Shafts are parallel. The flywheel is continually running but not...
  19. kandelabr

    Rotary Vane Pump Seals: Benefits, Types & Friction

    hi, i've read somewhere that modern vane pumps' vanes have an area of contact on the housing and the older versions had line contact. does anyone know how this is achieved? why is this better? how is this connected with friction? what types of seals are used, rubber or synthetic? any thought...
  20. H

    Linear and rotary movement of a shaft

    hi i am going to design a parallel plate rheometer as a part of my project.in parallel plate rheometer, the fluid is sandwitched between the plates and rotation is given to the top plate.top plate is made with shaft, rotation is provided to the shaft by servomotor and for placing the fluid and...
  21. N

    Cooling Rotary Stage with Conduction | Solutions

    I have a circular stage (made of stainless steel) that rotates continuously. How can i cool it by conduction? I thought of using water cooled copper braids that contact the sides of the stage, but it'll cause a lot of wear since the stage will be rotating alot. Any suggestions on how i can go...
  22. V

    What is rotary wheel-like appendages

    what is "rotary wheel-like appendages" what exactly do you mean by "rotary wheel-like appendages" what does it mean that we can not use rotary wheel-like appendages?... then what can we use?
  23. M

    Rotary Vane Compressor Design Calculations

    I am designing a sliding vane rotary compressor for a supercharger application on a small horsepower engine, but I am having trouble with the calculations. I have some estimations that I would hope to be correct (or close) but have no way to verify them at this point. One of the toughest parts...
  24. P

    Small Rotary Pump: Availability for 2x1x1cm, 1-50cc/min

    I need help, I have no background in engineering or fluid mechanics. I desire to find out the availability of a rotary/axial pump which has a size of 2cm X1 cm X1cm which can pump luids from 1 cc/min to 50 cc/min. The pump should be connected to the drive unit by a cable, so that the drive unit...
  25. R

    Rotary air compressor and vortex tubes questions?

    Hello, below are some specs I was provided of a micro screw air compressor, its physical dimensions are 4x4x4 and it seems pretty impressive for its size. However I am trying to understand a few things about the data that was provided. I am provided 6 charts on power/airflow/psi etc, each...
  26. A

    Rotary Vane Compressor Question

    Im quite new to this and having trouble in understanding the topic. - Rotary Vane Compressor. Can someone please explain why the air mass flow rate reduces when the delivery pressure increases? Thanks
  27. I

    Web - How to Calculate Power Required to Twist a Semi-Cylinder Filled with Sand

    I am in the process of designing a renewable energy generator, but am having difficulty with some of the math’s, so if anyone could help me out, it would be appreciated. I have never studied advanced math’s or physics before, so please describe your explanation in layman’s terms. One of the...
  28. M

    Rotary Water Pump Design & Mechanism: Get Expert Help Now

    hello all , i need some help about rotary water pumps (centrifugal) design , mechanism , ... can anyone help me please ?
  29. baywax

    Wankel Rotary Engine: Exploring Why It's Not Used More

    Is there a reason we don't see the Wankel rotary engine being used more as an alternative to the piston engine? I've heard different reasons but there must be a reason that its not used in every engine today. http://auto.howstuffworks.com/rotary-engine.htm I see that it was first used as an...
  30. A

    What are the Smallest Rotary Actuators for Low Torque and Angle Range?

    Hi people, I am trying to find the smallest possible rotary actuators (I think the electrical ones are the smallest in the category though maybe there are also pietzoelectic rotary actuators with high torque for small angles) for the 1-10 Nm (8 - 86 inch-lbf) range. I don't need them to...
  31. L

    Exploring the Effects of Skewed Cylinders in Rotary Kilns

    Hi, when two cylinders in contact, but not parallet to each other (skewed), are rotating, there is a development of forces between them which tends to push one cylinder along its rotation axis and the another one to the opposite side. In other words, there will be translation movement between...
  32. I

    Moller SkyCar: Wankel Rotary Engines and Lift

    i was reading on the moller skycar which has multiple wankel rotary engines powering ducted fans for lift, i was wondering if anyone had any information on how many pound of lift one of these engines on a regular ducted fan would have
  33. E

    Maximizing Rotary Projectile Motion: Finding Distance and Path Diameter

    Hi all, the problem i have is that there is a rotating disk with nozzles on its circumference. a material is being pushed into this rotating disk/plate and its being released from the nozzles tangentially. The disk is rotating with a certain rpm such that the angular velocity of the...
  34. E

    Calculating Longest Projectile Distance from Rotating Disk | Projectile Motion

    Hi all, the problem i have is that there is a rotating disk with nozzles on its circumference. a material is being pushed into this rotating disk/plate and its being released from the nozzles. The disk is rotating with a certain rpm. I want to know, how can I find the longest horizontal...
  35. †

    Using a Rotary Potentiometer and Float

    First off i'd like to say hi guys (and gals) - this may be my first post, but should hopefully be the first of many:smile: Basically i have a problem regarding some physics coursework. We're actually conducting these on the 8th of November - and i have a deadline of the 20th of November...
  36. S

    Rotary vane compressor lost motion?

    In a rotary vane compressor, the vanes constantly move in and out. Does the work required to accelerate the vanes radially outward and then inward cancel out or is the kinetic energy of the vanes lost and completely converted to heat?
  37. S

    Where can I find information on overhead crane wheel derailment and maintenance?

    Why can't rotary vane compressors deliver high pressure ratios efficiently considering that the bending stress decreases as the vanes in the compressor slide down.
  38. S

    Rotary Vane Engine: US Patent No. 5,711,268

    I came across this patent. US Patent no. 5,711,268 http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/search-bool.html&r=12&f=G&l=50&co1=AND&d=ptxt&s1=%27rotary+vane+engine%27&OS=%22rotary+vane+engine%22&RS=%22rotary+vane+engine%22 How good is the idea...
  39. Z

    The four-stroke engine with rotary cylinder block

    The cylinder block of traditional four-stroke engine can't move ,and it needs a complicated valve mechanism with large frictional losses and great noises to finish the the working cycle. Also because the journey of entering the intake system is long and the exist of the detour that causes the...
  40. M

    Comparing Data from Rotary Arm Sensor to Theoretical Square Wave

    I have collected 5000 points of data from a sensor on a rotary arm (which I was trying to control to move with a position time graph that follows the pattern of a square wave) My question is, once I've plotted the graph in excel, how can I overlay a perfect (theoretical) square wave to show...
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