Blog 2: Gears Documentation Blog Entry⚙️👷♀️
- Valarie Goh
- Nov 18, 2022
- 5 min read
Updated: Dec 3, 2022
Yo sup everyone! 🤟 I am back with another blog for CPDD woohoo!🥳 So today I will be sharing🔊 my journey in practical 2 about gears with you all. So let's kick off with the practical lesson of the gears session experience🤓 and I hope yall will learn something from it woohoo! 😉
In this page, I will describe🤓:
These are the definition of gear module, pitch circular diameter and the relationship between gear module, pitch circular diameter, and number of teeth📋:
Definition of Gear Module⚙️:
Refers to the size of the gear tee
Unit of "module": mm
Larger the module number👆, the larger the size of the teeth👆
Gears that mesh together has the same module.🔁
Definition of Pitch Circular Diameter📋:
When the imaginary circle that passes through the contact points between two meshing gears.
It represents the diameters of two friction rollers in contact and moves at the same linear velocity.
Relationship between Module (m), No of teeth (z), and Pitch Circular Diameter (PCD)📋:
m is inversely proportional to z but directly proportional to PCD.
Using the formula of PCD:
Below is the relationship between gear ratio (speed ratio) and output speed for a pair of gears.📋
Below is the relationship between gear ratio and torque for a pair of gears.📋
It is used to calculate the speed 🛣 and torque of the output shaft when input and output shafts are connected using a gear train🚇.
The gear ratio is directly proportional➡️to the torque and inversely proportional to the speed⬅️.
Below is the proposed design to make the hand-squeezed fan better📋:
Ways to make the hand-squeezed fan better📔:
To make the 3d printing of the gears smoother (it will be very hard to rotate the gears if it has too much excess hair from the 3d printing) by using :
Sanding
Bead Bleating
Vapor Smoothing
Ensure that the input and output are one big and one small to increase the power of a turning force as if both gears have the same diameter, they would rotate at the same speed but in opposite directions.
Proposed Design🖼:
Sketch🧑🎨:
Using the Gear Ratio formula:
Video🎥:
Front | Back |
|---|---|
Below is the description on how my practical team arranged the gears provided in the practical to raise the water bottle.
Calculation of the gear ratio (speed ratio)🧮:
Using the gear ratio formula:
The photo of the actual gear layout📷.
Photo📸:
Without the board (trial and error) | With the board (finalize) |
|---|---|
 |  |
Sketch🧑🎨:
Calculation of the number of revolutions required to rotate the crank handle.🧮
The video of the turning of the gears to lift the water bottle.📺
😍Below is my Learning Reflection on the Gears Activities😍
During the start of the theory📒, among the rest of the groups, my group took the longest😓 to finish as we were checking online for the answer📝 as we know that we need this paper for our quiz📖 after the whole hands-on activities👐 one thing I realized about that paper🧾 was that we do not need to find it so in depth from online as the most answer can be found in the video from our pre-practical package. 🤭
During the start of activity 1🔧, Mr. Ting show an example of a set of gears⚙️ on how to increase the speed of rotation🏎 and we were tasked to perform the maximum gear ratio of the set. At first, we get like around 1.75 in our gear ratio😞 which slowly increase to 4.75 in our gear ratio😀 as we changes the sequence of it and we reach the maximum gear ratio which is 26.67 we were happy at first 🥳as we finally got it after around 10 to 20 minutes. However, the hardest part😕 was to fix all these sets of gears inside the board🔨 it may look easy but when you started to find the hole inside to poke through in the board it is very difficult and challenging for us. 😩
After a while⏱, we get used to it and we got the momentum💯 on how to do it after setting up the whole board it was time to tie a knot to the bottle of water🚰 that we fill up and measure in the open pan weighing the balance of 49.242g⚖️ Therefore, we started to adjust the level of the bottom 200m above the ground and make sure everything is stable. 🧗♀️
While I was turning the handler it broke by itself 😖due to my strength💪 and I ask Mr. Ting for hot glue gun thinking that I can fix it👷♀️however marks will be deducted🚫 if any equipment is broken haizz😢to my dearest team members my bad I too strong already opps. I learn from my mistake that I should not use too much strength to turn the handler.😨
But another thing I noticed from my setup of the gear is that the last gear with the string, the string itself is always obstructing⛔ the previous gear causing the gear to stop rotating🔃 and decrease the speed📉 of moving up the bottle. I think one thing that can be improved is to ensure the starting line knot is not that long so no matter how much your release it will not dangle🧵 at the side obstructing the previous gear.
After videoing activity 1📽, we carry on to activity 2 where we do a hand-squeezed fan🤯, I and asraf took around 45 seconds to 1 minute to finish setting up.🤩 It was the easiest😆 as compared to the first activity but one con🥴 as you can see from the video is that the hand-squeezed fan was 3D printed and there are some residues from the 3d printing therefore whenever we start pressing the handle🔨, the handler did not release it easily as some of the residues obstructing the handler to release easily. I feel that these residues can be removed❌ using many ways like sanding and etc.
After the whole activity🙆♀️, we got a quiz🤐 we were not on time for the quiz🔇 but nevertheless, my group finishes around 10 to 20 minutes⏱ to complete the quiz✅ and hand up to Mr. Ting the quiz was manageable😁 as most of the questions are found in the paper that we wrote📝.
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