⚙️ GEARS BLOG ENTRY ⚙️

HEY GUYS I'M BACK WITH ANOTHER BLOGGGG!!!👋🏻👋🏻 WOOHOO!🥳

I BET YALL WILL LOVE THIS BLOG 💁🏼‍♀️😍

I WILL BE DISCUSSING MY EXPERIENCE USING MY KNOWLEDGE🧠 OF GEARS IN BOTH THEORETICAL🔖 AND PRACTICAL👷🏻 CONTEXTS.

I AM NOT GOING TO KEEP YALL WAITING🥵 SO LET'S GET STARTED🔫🔊

Definition of gear module and pitch circular diameter

Gear module

"Module" is the unit of size that indicates how big or small a gear is 🤔. It is the ratio of the reference diameter of the gear divided by the number of teeth.

• The unit for the module is: mm

• Larger the module number⬆, the larger the size of the teeth⬆.

• Gears that mesh together are having the same module.

• Module= Reference diameter/Number of Teeth

Pitch Circular Diameter

Pitch Circular Diameter is the imaginary circle that passes through the contact point between two meshing gears. It represents the diameter of two friction rollers in contact and moves at the same linear velocity 😯.

Relationship between gear module, pitch circular diameter, and number of teeth 🔍

The Module is inversely proportional to the Number of Teeth but directly proportional to PCD.

PCD = πd / z

What is Gear Ratio❓

The gear ratio is the ratio of the number of teeth in the gear to the number of teeth in the pinion, the pinion being the smaller of the two gears in the mesh.

Gear Ratio = Number of Teeth of Follower Gear/ Number of Teeth of Driver Gear

Below is the Relationship between gear ratio (speed ratio) and

output speed for a pair of gears ⬇️⬇️

- When the Gear Ratio increases⬆, Output Speed decreases⬇.

- Gear ratio is inversely proportional to the output speed.

Below is the Relationship between gear ratio and torque for a pair

of gears ⬇️⬇️

- When the Gear Ratio increases⬆, the Torque also increases⬆.

- Gear ratio is directly proportional to the torque.

The proposed design to make the hand-squeezed fan better ✅ 👍🏻

Electric Fan that my group assembled👷🏻

Sketch✏️ of that electric fan

The Gear Ratio of the electric fan:

Gear Ratio = (10/20) ✖️ (9/20) ✖️ (9/20) = 0.10125

I believe one way to make the hand-squeezed fan better is to use an output gear that has a lesser number of teeth and use an input gear that has more teeth than the output gear💡 which will increase⬆ the power of the turning force 😲.

Another way 👀 is by sanding the inner parts of the fan during the experiment when the handle of the fan was being pressed, it was kind of hard 😪 as there were parts that needed to be sanded thus after sanding, the speed of the fan could definitely increase⬆⬆ also.

Sketch 🖼 of the proposed design

The Gear Ratio of the proposed design: Gear Ratio = (10/30) ✖️ (9/20) ✖️ (9/20) = 0.050625

As we can see when the input gear teeth (30T) are more than the output gear teeth (9T), the gear ratio decreases from 0.10125 to 0.050625 ✅ 😃.

The description 🔖 of how my practical team arranged

the gears ⚙️ provided in the practical to raise the water bottle💧

Calculation of the gear ratio (speed ratio)

Gear ratio = 40/30 + 40/12 + 40/40 + 30/20 + 40/20 + 30/20 + 40/20 = 26.67 (2dp)

The photo 🎑 of the actual gear layout

​Finalize Version on the Table

Finalize Version on the Board

Sketch 🖼 of the gear layout

Calculation of the number of revolutions required to rotate 🔄 the crank handle

Diameter of the last gear = 2.1 cm = 21mm

Circumference of the last gear = πd = π ✖️ 21 mm = 65.9734457254mm

Revolution = (distance traveled/circumference of the last gear) ✖️ gear ratio

Revolution = (200/65.9734457254) ✖️ 26.67

Revolution = 80.85 (2dp)

The Video 📹 of the turning of the gears to lift the water bottle

1

Learning Reflection🗣

This practical was a little different 🤓 as I got to learn about gears ⚙️ and how to apply them in certain contexts. Before the practical, we were asked to go through 4️⃣ videos about gears so that we could learn the basic principles 📌 of gears and thus will make the learning ✏️ in practical effective. During the practical, what my group did was a worksheet 🔖 relating to gears where we had to answer a couple of questions regarding gears. I would say my group took pretty long ⌛️ to attempt the worksheet as we were googling 🥸 these answers and since google has so many answers we were trying to find the best answer which sounds reasonable and appropriate 👍🏻. Another reason was that we had to attempt a quiz 📄 after the practical and we could only refer to the worksheet that we are doing so we wanted to make sure the worksheet is properly completed 🥵. Due to lack of time 😫 we then quickly started on our first activity 👁 which was lifting water 💧 using gears ⚙️. That activity was definitely the most mentally tiring 😓 one of that day. First, we started to arrange👷🏻 the gears given to us on the table and we started to figure out different combinations of gears 😵‍💫 that can give us the highest gear ratio which will increase⬆ the speed of the rotation to lift the gear up. For our first try, we got around 1.75 which was not what we wanted ❌. After many tries, we got 4.75. We almost gave up 😷 because we thought there were no other combinations that were possible but then Mr. Ting came and help us in a way that immediately then we knew what we could change 🤭😃. Then we got 26.67 😲 as our gear ratio which made all of us very happy 😆. My teammates Valerie and asraf then started to fix the gears 👩🏼‍🔧👨🏼‍🔧 on the board and it definitely looks really hard 😓 to get it on but I think after a while they kind of got used to it and then they could complete the fixing of it. They then fill the bottle 🧴 up such that the weight is around 0.5-1L. They managed to get a weight of 49.242g 🧐. They then started adjusting the bottle to the board. Well, something that was not expected 😬 was that under that pretext Valarie broke the handler as she was trying to turn it 😱. Unfortunately, marks will be deducted for any broken items so why did that happen, Valerie?!!!?!?!?! 👹👹 Anyways it was accidental and I am pretty sure she will be much more careful in the future 😮‍💨🙂. We then started to film 🎬 the lifting of the water bottle using the gears. Afterward, we did our last activity which was assembling the hand-powered fans. That was definitely the easiest 😌 one as my group and I took less than 1 minute ⏱ to do so. One problem we noticed 🤨 was that the handle could not be pressed easily I'm pretty sure the inner parts of the fan were not sanded properly as it is clearly 3D printed 🖨. We then took a video 🎥 of it when the handle is being cranked. Overall, this practical was mentally taxing 😮‍💨, but I enjoyed 🤠 it because I learned ✍🏼 about gears, which will be useful for my future projects 👩🏽‍💻 such as FYP.

THANKS FOR READING MY BLOG‼️

HOPE YALL GAIN SOME KNOWLEDGE ALONG THE WAY 👀 AND ARE ABLE TO APPLY IT IN YOUR DAILY LIFE 🌆. CHECK OUT MY PREVIOUS LASER BLOG IF YOU HAVENT! 🌚🌚

I'LL BE BACK SOON FOR MY NEXT BLOG ⭐️ AND I HOPE YALL HAVE A GREAT DAY 🌈