Mechanical principle animations on par with blockbusters

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Why does the chain of a chainsaw keep moving at 70 kilometers per hour? . ^2 k$ {8 N" h8 r$ C' K3 m Tens of thousands of components work together in a chainsaw/ }; q6 K( v/ s# O http://5b0988e595225.cdn.sohucs.com/images/20190325/86617d98174a4841b15df8bcde3732d0.gif: ]. a: W2 i) d* Z" J: n+ X& m5 G A small and lightweight piston drives the rigid shaft▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/bb689cbf556a48d88ae7e691fcac4e8c.gif0 h) I, j L/ t' m; } w! U 2 The triple-link chain enables a speed of 70 kilometers per hour▼! F# a( Y; n' L" w' m http://5b0988e595225.cdn.sohucs.com/images/20190325/bb1e6c3bc47d48e7a1a1f8191a5476ef.gif 3 There are 33 razor-sharp cutting teeth on the outside, allowing it to cut through the hardest woods in the world▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/a7b0e770304f4f57977aff9855b1726c.gif) @- p5 x$ l% o8 ~- | 4 But the power of a chainsaw doesn’t come from its cutting teeth; it comes from thin metal strips called “guide rods,” with the chain wrapped around their edges. The guide rod must be strong to support high-speed movement, but it also needs to be light enough since loggers have to carry it around all day. ▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/92937761fd244829b0101228bfe488b4.gif How can a Yo-Yo spin as fast as an Formula 1 car engine? A well-designed balance system ensures that the yo-yo can be thrown and retrieved smoothly, while allowing it to rotate continuously at high speed without any slowdown▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/4b84b313301d43cf883082954e406f4b.gif& G: t. O3 z# ? http://5b0988e595225.cdn.sohucs.com/images/20190325/1cbfcc4fa86042c5aeab6c312eda5bc1.gif To achieve this, there is a clever mechanism inside the yo-yo, one that is even smaller than a penny▼$ R1 a, h! B/ N) K9 ~2 S3 ? Between the inner and outer rings, 10 small steel balls roll together, thereby reducing friction between them▼1 x2 ^, i$ i1 x5 G+ ` http://5b0988e595225.cdn.sohucs.com/images/20190325/00392267f582442992e6be5250f23231.gif Even though the string is wrapped around the outer ring, the inner ring can still rotate at full speed, just like an F1 race car▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/f841b734ab344ab6bb3f8b79d47a82fe.gif- n3 l# {7 ]4 {, c2 C- F This ingenious design allows the yo-yo to keep rotating until the end, and the weight on both sides of the yo-yo also helps to delay its deceleration. How is a fishing line several hundred meters long rolled up? ( V/ ^* t: y& l6 b# s9 A Under the ultra-light aluminum alloy frame of the fishing line, there are 141 precise components▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/00cc0d08add043c581332e8d4c760535.gif 1 The fishing line is made from a special woven thread that is over 540 meters long, and it can withstand a weight of 65 kilograms▼( z* X+ F* I5 |# h http://5b0988e595225.cdn.sohucs.com/images/20190325/5034180bb0e143318a0e16236b1841de.gif 2 The stainless steel balls inside rotate around the bearings at a speed of 10,000 times per minute▼5 I( Z k4 X' C/ d& _ http://5b0988e595225.cdn.sohucs.com/images/20190325/fadeaf6679e24071bb68507b7cd94c1f.gif 3 Precision gears drive the crank, enabling the fishing line to be retracted▼+ p! _$ q/ H J4 A q0 http://5b0988e595225.cdn.sohucs.com/images/20190325/9b8ba657ed5c4d5d9debd5fc79524ef7.gif: ]3 v+ N! U' K( l/ Z 4 How does cutting-edge technology help make vinyl record players more impressive? 5 ^9 `5 G5 B, } Q& | http://5b0988e595225.cdn.sohucs.com/images/20190325/baf1c10cf6cc4a46a357c42bfe6de591.gif Inside a vinyl record player, 240 precision components work together to ensure optimal performance. ▲& m+ H( q1 Z5 N4 u7 h The two interlocked zinc alloy record platters maintain extreme stability, allowing the needle to read the record accurately. ▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/aa705452fda2469f8e6288208235003e.gif” m: y* a V/ R# Z& I$ u. j’ u” L The two interlocked zinc alloy record platters keep things stable, enabling the needle to read the record precisely. The needle, made of precision carbon, detects these subtle variations on the record surface, converting those bumps and dips into music. 7 j, A% C, r: s) O The needle is attached to the end of the arm; as it moves back and forth, left and right, the coil rotates between two magnets, generating an electric current. This current drives the amplifier and speakers, producing beautiful sound. ▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/d517329cb81d435188c6887c5cd3078d.gif2 `4 }, `9 ^: V It produces beautiful sound. – k: ?6 L! Q6 M How does a treadmill prevent people from falling? 2 V: k1 y* http://5b0988e595225.cdn.sohucs.com/images/20190325/81ba31c716d0482da76d6bd086e95713.gif9 D( m* i2 u# u; M Transmission ▲ Six rubber shock-absorbing bars are attached to the bottom as shock absorbers, reducing the vibrations generated by the feet on the conveyor belt▼0 X3 \2 I' E' y- D) }8 I http://5b0988e595225.cdn.sohucs.com/images/20190325/2f916319e6b849febb2bc5cd047a9a73.gif+ p: A/ k- C9 y" L Shock absorption ▲ There is a 2.5-cm-thick running surface on the bottom plate, which is waxed on the outside and fixed at the rear with hinges; this provides a stable surface for running and helps reduce strain on the knee joints▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/6962b96120684834812d018b13f7130c.gif Stability & fixation ▲" m2 _# m* L3 _4 ? The rollers need to be sturdy to ensure that the runner’s foot contact with the conveyor belt can be recorded, thereby allowing the tracking of the runner’s step frequency. Through the computer console, it is possible to set the desired running speed. Each time the foot presses down heavily on the running surface, the conveyor belt begins to slow down, and the drive units come into action to immediately counteract this slowdown▼8 X, e6 Z- g; i, Q: t' x http://5b0988e595225.cdn.sohucs.com/images/20190325/099a6f50b4a0491b8a99a2baf789b31c.gif Deceleration▲* Q5 C0 T. Y9 m1 ^% `% x The electronic controller can detect changes in walking speed and then issue commands to make the engine spin faster, so that the conveyor belt can return to its preset speed and match the runner’s stride, allowing the runner to experience a comfortable and smooth running experience throughout▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/26ebe64b38aa42d2a4920744dcc36264.gif Speed control▲ How do vending machines distinguish between coins? http://5b0988e595225.cdn.sohucs.com/images/20190325/2126dcd2e8634a89a3d35569e07cc54a.gif First, the sensing coil detects the size of the coin, while the electromagnet determines its material▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/a6fbfe36f7c14ed296034749f77b86ab.gif The machine identifies the coins at the moment they are inserted and sorts them accordingly) b7 b; I& D, f( ? When anything abnormal is detected, fake coins are ejected▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/0194d4d432e244388a20b75168c61c9c.gif8 When giving change, the machine dispenses the coins one by one▼ http://5b0988e595225.cdn.sohucs.com/images/20190325/c6a6ca77824d489b9eb2053b3efbecb9.gif These steps enable the machine to handle nearly 15,000 coins per year