CP5070-2022-2B05-Group 3-Asraf-Blog 3 (Gears)

 

Welcome back to my blog, for today's blog is where I'll share my experience handling with gears during my practical on Wednesday. 

These are the definition of gear module, pitch circular diameter and the relationship between gear module, pitch circular diameter and number of teeth:

Gear Module – Refers to the size of the gear teeth. The unit for gear module is mm. Larger a gear module number, larger the size of the teeth. In short, it refer to the size of the individual teeth on the gear 

Pitch Circular Diameter (PCD) – Is the diameter of the circle which passes through the center of all the studs, wheel bolts or wheel rim hols.

M refer to Gear Module

PCD refer to Pitch Circular Diameter

Z refer to Number Of Teeth 

Relationship between gear ratio (speed ratio) and output speed for a pair of gears.

Based on the equation; It shows that Speed Of Shaft (Output) is inversely proportional to Gear Ratio. If Gear Ratio has a lower value, the value of  Speed Of Shaft (Output) will have a high value

Below is the relationship between gear ratio and torque for a pair of gears.

Based on the equation; It shows that the Gear Ratio is directly proportional to Output Torque. If the Output Torque has a high value, the value of gear ratio will have a high value as well

Below are the proposed design to make the hand-squeezed fan better

Ensure that the gear are able to run smoothly by making gear smooth as I had a hard time pressing the handle. Is easy to press it in but is hard for the handle to return to its original force without using force. 

Ensure that the rode that is supposed to hold everything together is a perfect circle because it took my awhile and I have to use a bit of my strength to get the rod into the hole to secure it

Below are the description on how my practical team arranged the gears provided in the practical to raise the water bottle

a.    Calculation of the gear ratio (speed ratio).

b.    The photo of the actual gear layout.

Here the drawing that I did using Visio. Is way easier to use visio than drawing by hand and is much faster as well. 

c.    Calculation of the number of revolutions required to rotate the crank handle.

d.    The video of the turning of the gears to lift the water bottle.

Below is my Learning Reflection on the gears activities

We were required to complete the paper for the first task, which will aid us in the quiz. We didn't expect it to take as long as it did because we were so sure of ourselves. Which is something that can be changed because a lack of confidence will unquestionably have an impact on our performance over time.

We were required to lift the water bottle using gears for the second activity. My team made a mistake in the first section because we were panicking because we were lagging behind the other teams. As a result, setting up the gear with the highest gear ratio took much longer for us than it did for the others. We learned from one of the teams that the denominator value was less and the numerator value was larger. With that information, we were able to increase the gear ratio from 4.3 to 9.6, which is still incorrect. The next piece of information came from our instructor, who mentioned that we could combine simple and compound gear trains to get the highest possible gear ratio of 9.6 to 26.67. We successfully arrange everything on the board and turn the crank to raise the bottle 200mm off the ground. The aspect of this activity that we can enhance is that we need to remain calm during the entire procedure so that it won't produce so much fluttering in our heads that results in misunderstandings between one another.

We had to put the hand-powered fan together for the third exercise. Honestly, of the three, that was the easiest to complete. In less than three minutes, I am able to put everything together on my own. The only issue I have is actually when I try to use the fan. Squeezing the handle to move the fan was challenging; perhaps this was because the gears weren't smooth against one another.

I can confidently state that my team can outperform Wednesday's practical. Both the group and the individual have room for improvement. We all shared a similar lack of confidence because it affects most of us frequently. We will undoubtedly perform better in the future and eliminate our lack of confidence so that it won't impact us.