Notes on Continuously Variable Transmissions Continuously Variable Transmissions are transmissions that provide an uninterrupted range of speed ratios, unlike a normal transmission that provides only a few discrete ratios. Frictional Type The most common type of CVT is the frictional type, in which two bodies are brought into contact at points of varying distance from their axes of rotation, and allowing friction to transfer motion from one body to the other. Sometimes there is a third intermediary body, usually a wheel or belt. The simplest CVT seems to be the "disk and wheel" design, in which a wheel rides upon the surface of a rotating disk; the wheel may be slid along it's splined axle to contact the disk at different distances from it's center. Friction plays an important part in frictional CVT designs - the maximum torque transmissible by such a design is: Tmax = Cf × FN × Ro Power is lost in two ways: deformation of the components; and differential slip. More advanced designs used three bodies instead of two. Electrical Type
mental_floss Blog » How Did the Duck Hunt Gun Work? If you’re a geek of a certain age, a good portion of your childhood probably revolved around sitting too close to the TV, clutching a plastic safety cone-colored hand gun and blasting waterfowl out of a pixilated sky in Duck Hunt (also, trying to blow that dog’s head off when he laughed at you). The Duck Hunt gun, officially called the Nintendo Entertainment System (NES) Zapper, seems downright primitive next to the Nintendo’s Wii and Microsoft’s Kinect, but in the late 80s, it filled plenty of young heads with wonder. How did that thing work? Annie get your Zapper The Zapper’s ancestry goes back to the mid 1930s, when the first so-called “light guns” appeared after the development of light-sensing vacuum tubes. In the first light gun game, Ray-O-Lite (developed in 1936 by Seeburg, a company that made parts and systems for jukeboxes), players shot at small moving targets mounted with light sensors using a gun that emitted a beam of light. Gone in a Flash
13 more things that don't make sense Cookies on the New Scientist website close Our website uses cookies, which are small text files that are widely used in order to make websites work more effectively. To continue using our website and consent to the use of cookies, click away from this box or click 'Close' Find out about our cookies and how to change them Log in Your login is case sensitive I have forgotten my password close My New Scientist Look for Science Jobs 13 more things that don't make sense (Image: Loungepark / The Image Bank / Getty) Strive as we might to make sense of the world, there are mysteries that still confound us. Axis of evil Radiation left from the big bang is still glowing in the sky – in a mysterious and controversial pattern Dark flow Something unseeable and far bigger than anything in the known universe is hauling a group of galaxies towards it at inexplicable speed Eocene hothouse Tens of millions of years ago, the average temperature at the poles was 15 or 20 °C. Fly-by anomalies Hybrid life Morgellons disease
Engineering ToolBox thanksgiving. thanksgiving. an all american (and canadian) festival to help all the hardworking folks stop, breathe and give thanks for the harvest. it’s probably the only thing i wish great britain and the colonies could do with adopting from the US. you can keep your over-sized lattes with your frothy topping and caramel sauce, but you can never say too many thank-yous. the practice of gratitude helps you slow down, take stock of what you have been given and develop a little underrated characteristic called joy . us consumers in the western world know a lot about entertainment, and a lot about titillation and a whole lot about working hard but really, very little about lasting joy. it’s from the and the pursuit of happiness blog. enjoy! and a big thank you for reading. xx Posted: November 27th, 2009 | Author: Lady Worthington | Filed under: nature , Uncategorized | Tags: america , canada , harvest , joy , thank you , thanks , thanksgiving , the pursuit of happiness | 3 Comments »
Waterjet Web Reference: Info and resources for water jets.