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Crazy Contraptions: Build Machines That Swoop, Spin, Stack, and Swivel; With Engineering Activities for Kids

為了解決Unscrew的問題，作者Perdew, Laura/ Rauch, Micah (ILT) 這樣論述：

An exciting book about the chain reaction world of Rube Goldberg for middle schoolers, including 25 engineering design projects that get middle schoolers applying the laws of physics to their own inventions as they learn the scientific principles behind the actions and reactions they create.Why u

se a simple hand motion to wipe your mouth when you can build a machine to do it for you? Toppling dominoes, rolling marbles, racing balloon cars, springing catapults, and whizzing zip-lines are all elements used to build Rube Goldberg machines in Crazy Contraptions: Build Rube Goldberg Machines tha

t Swoop, Spin, Stack, and Swivel with Hands-On Engineering Activities. The book introduces kids ages 9-12 (and beyond ) to the wacky machines designed by Goldberg, which were based on complicated chain reactions used to accomplish very simple, sometimes ridiculous, tasks.- Through contraptions, the

book discusses the basics of physics, including force, motion, and work. Each chapter introduces one of the six simple machines and how they can be used in Rube Goldberg contraptions--inclined planes, levers, wheels and axles, wedges, screws, and pulleys. - Kids are challenged to design, build, and

evaluate dozens of increasingly complex contraptions that do things like unscrew a lid, turn the page of a book, and pop a balloon. - Projects use materials already in most homes--reimagining and repurposing everyday items, as well as mining the recycling - Contraption hints, essential questions, s

hort sidebars, and links to online primary resources help readers learn the basics of force, work, motion, and simple machines, while exploring their creativity as they design and build their own crazy contraptions.About the Build It Engineering set and Nomad PressCrazy Contraptions is part of a set

of two Build It Engineering books that explore the engineering technology behind our daily lives. The other titles in this series is Bots Robotic Engineering with Hands-On Makerspace Activities.Nomad Press books in the Build It series integrate content with participation. Combining content with in

quiry-based projects stimulates learning and makes it active and alive. Nomad's unique approach simultaneously grounds kids in factual knowledge while allowing them the space to be curious, creative, and critical thinkers.All books are leveled for Guided Reading level and Lexile and align with Commo

n Core State Standards and Next Generation Science Standards. All titles are available in paperback, hardcover, and ebook formats.

Unscrew進入發燒排行的影片

手工具機之直流無刷馬達扭力估測

為了解決Unscrew的問題，作者許博堯 這樣論述：

電動起子應用於高精密貴重儀器設備裝配場域中鎖卸螺絲時，若無扭力感測，在鎖緊無法再鎖入時，會造成螺絲崩牙、牙槽損毀、進而可能對精密裝配設備造成不良影響，甚或造成損壞。因此，電動手工具機具備扭力估測能力，在操作時達到扭力設定值時，能停止運轉，可降低其在高精密貴重設備裝配場域鎖卸螺絲時因扭力過大所造成的風險。本論文針對電動手工具機使用之直流無刷馬達(內建霍爾感測)進行扭力估測研究，透過自行建置量測系統平台，經由回授電流與扭力計，量測直流無刷馬達於不同負載下穩態運轉時的轉速、電流、扭力，進而擬合出電流扭力數學式，藉此數學式，在馬達扭力負載動態上升變化情況下，透過即時回授之馬達電流值來估算馬達即時扭力

，當估測值達到設定值時即可停止運轉，如此一來可避免馬達、螺絲及儀器在堵轉時的傷害及風險，並增加在精密的儀器場域使用的安全性。經由動態調升負載扭力，量測即時回授之馬達電流值以估算扭力，並比較估測扭力與實際量測扭力，來驗證其精準度。若設定馬達停止之負載扭力值1N-m到2N-m間，發現最大誤差為0.14N-m（誤差百分率為13.21%），最小誤差為0.002N-m（誤差百分率為0.11%），同時從數據發現，較接近大扭力（2N-m）時，誤差較小。另外比較穩態電流扭力擬合直線與動態電流扭力擬合直線，兩條直線的斜率誤差值0.0001、節距誤差值0.1225。從實驗結果得知，建立穩態電流扭力曲線，在沒有扭力

感測器的情況下，可做為估算扭力值的一種簡單方法，讓馬達達到估算設定值時停下。

Crazy Contraptions: Build Machines That Swoop, Spin, Stack, and Swivel; With Engineering Activities for Kids

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為了解決Unscrew的問題，作者Perdew, Laura/ Rauch, Micah (ILT) 這樣論述：

An exciting book about the chain reaction world of Rube Goldberg for middle schoolers, including 25 engineering design projects that get middle schoolers applying the laws of physics to their own inventions as they learn the scientific principles behind the actions and reactions they create.Why use

a simple hand motion to wipe your mouth when you can build a machine to do it for you? Toppling dominoes, rolling marbles, racing balloon cars, springing catapults, and whizzing zip-lines are all elements used to build Rube Goldberg machines in Crazy Contraptions: Build Machines that Swoop, Spin, St

ack, and Swivel with Hands-On Engineering Activities. The book introduces kids ages 9-12 (and beyond ) to the wacky machines designed by Goldberg, which were based on complicated chain reactions used to accomplish very simple, sometimes ridiculous, tasks.- Through contraptions, the book discusses th

e basics of physics, including force, motion, and work. Each chapter introduces one of the six simple machines and how they can be used in Rube Goldberg contraptions--inclined planes, levers, wheels and axles, wedges, screws, and pulleys. - Kids are challenged to design, build, and evaluate dozens o

f increasingly complex contraptions that do things like unscrew a lid, turn the page of a book, and pop a balloon. - Projects use materials already in most homes--reimagining and repurposing everyday items, as well as mining the recycling - Contraption hints, essential questions, short sidebars, an

d links to online primary resources help readers learn the basics of force, work, motion, and simple machines, while exploring their creativity as they design and build their own crazy contraptions.About the Build It Engineering set and Nomad PressCrazy Contraptions is part of a set of two Build It

Engineering books that explore the engineering technology behind our daily lives. The other titles in this series is Bots Robotic Engineering with Hands-On Makerspace Activities.Nomad Press books in the Build It series integrate content with participation. Combining content with inquiry-based proje

cts stimulates learning and makes it active and alive. Nomad's unique approach simultaneously grounds kids in factual knowledge while allowing them the space to be curious, creative, and critical thinkers.All books are leveled for Guided Reading level and Lexile and align with Common Core State Stan

dards and Next Generation Science Standards. All titles are available in paperback, hardcover, and ebook formats. Laura Perdew is an author, writing consultant, and former middle school teacher. She has written more than 20 books for the education market on a wide range of subjects and is the auth

or of Extinction What Happened to the Dinosaurs, Mastodons, and Dodo Birds? and Biodiversity: Explore the Diversity of Life on Earth with Science Activities for Kids. She is a long-time member of the Society of Children’s Book Writers and Illustrators, and an avid runner and hiker. Laura lives and p

lays in Boulder, Colorado.Micah Rauch is a freelance graphic designer and illustrator from the beautiful state of Montana. He received a BFA in graphic design from Montana State University in Bozeman Montana. He has loved the magical act of drawing his entire life and continues to learn and push his

skills both as a designer and an illustrator.

微手掌的建模與控制器設計

為了解決Unscrew的問題，作者鍾永利 這樣論述：

本文提出建模和控制器設計微手掌系統，一個五隻手指的微手掌系統。提出兩個新的運動學模型，並推導手指指尖的運動軌跡追蹤，各別稱為maximum angle model和differential angle model。每個手指，有四個關節，僅透過一個微永磁同步電動機來驅動腱機構。双自由度的比例-積分-微分控制器，用來獨立地和同時控制各微型永磁同步電動機。因此，每隻手指被獨立地控制，以控制手指移動位置。此外，手指的指尖有壓力感測器，透過使用兩種方法來控制。第一個是力傳輸信號的測量方法，第二個是q軸電流的測量方法。執行壓力的控制，以避免損壞抓取物。微手掌能精確地握住雞蛋、球、剃須膏、標記筆、瓶罐，和

滑鼠。實驗結果證明双自由度的PID控制器的性能比PI控制器更好。