Linkage mechanisms are systems used to transmit forces and motion, consisting of links, joints, and input/output points:
Links: components that connect at joints.
Joints: Points where links move relative to each other.
Input/Output: Places where motion or force enters or exits the system.
Real-life applications of linkage mechanisms:
Scissors: A pair of scissors uses a simple pivot joint linkage, where two levers (the blades) are connected.
Seesaw: A seesaw is an example of a lever linkage in playgrounds.
ii. Simulation of Linkage Mechanisms
Crank slider mechanisms
L=3.9cm,B=3.9cm,H=2.2cm
l=3.4cm,b=0.4cm,h=2cm
Volume= 33.46+2.72=36.18cm^3
m=284.013g
284.013/1000 = 0.28 kg
Force=0.6X0.28X9.81 = 1.65 N
T=1.65 X 0.36 = 0.594 Nm
Tmax = 0.594 X 1.5 = 0.891 Nm
N=0.891 X 100/9.81 = 9.1 rpm
reflection: Through this activity, we understood how to choose a specific motor for our needs so that we don't choose the wrong motor; we can avoid choosing motors with low power for required components.
Mass of the Castor wheel(metal) is 0.018 kg.
Assume motor mass to be 300 gms each. total =600g
Select the material as Mild Steel.
Assume that we will be loading 0.3 kg on the top plate.
thickness = 1mm = 0.1 cm
mue=(rubber and dry cement)=0.85
rho steel = 7.85 g/cm^3
volume= area X thickness
v top plate=11.5 X 10.3 X 0.1cm=11.845 cm^3
v side plate=4.6 X 5.2 X 0.1cm=2.392 cm^3
v side plate=0.8 X 5.2 X 0.1cm=0.416 cm^3
v side plate=2.808 cm^3=2(2.808)-5.616
v front plate=13.53 X 0.1=1.353 cm^3
v front plate=23 X 0.1=2.3 cm^3
v front plate=6.4 X 1 X 0.1=0.64 cm^3
v total = 21.745 cm^3
m plate=7.85 + 21.7456=170.69 gm
170.69/1000 = 0.17069 kg
m=1.089 kg
F=meu X mg
=0.85 X 1.089 X 9.81= 9.0806 N
T=9.0806 X 0.3270 X 0.036
Tmax=1.5 X 0.3270
Tmax=0.49 N-m
Tmax=0.49 X 100/9.81
Tmax/2=2.4 ~ 3.6
60 rpm
we will use the 12v, 1A adapter for
Reflection: This activity helped us learn how to select the right motor for our needs, ensuring we avoid picking motors that lack sufficient power for our components. By understanding which motors to choose, we also learnt how we can prevent the mistake of using wrong adapter.