المنهج السعودي
المنهج العراقي
المنهج المصريDesigning D Gears - Engineering Design - ثالث ثانوي
Introduction to Gears
Mechanism of a bicycle
Creating a Simple Machine
Designing an 8 -Tooth Gear
create an 8-tooth gear body
When you have multiple bodies in a design, it can be di icult to keep track of which boy represents what part of the project
add an involute gear
make the gear 3D
Designing a 24-Tooth Gear
add an involute gear
Setting the module to 1.00 mm means that the gear teeth will be 1.00 mm wide and 1.00 mm high
make the gear 3D
Gears Engagement
Moving the small Gear
If the center distance between two gears is incorrect, the gears will not mesh properly and will not transfer power e iciently
Rotating the small Gear
Making Holes in the Gears
create a circle
create a hole
Crea琀椀ng a hole
To zoom in and out, you can scroll the mouse wheel up and down, or use the zoom buttons on the toolbar.
View options
Making a Hole in the Big Gear
create a circle:
create a hole
Designing a Base to Connect the Gears
The proper alignment of the gears is critical for e ective teeth meshing
create a sketch
create a rectangle
Not all sketches need to be fully constrained. In some cases
create a 3D shape
create a sketch in the top surface of the Base
create the big circle
create the center of the small circle
create the small circle
create the cylinders
move the Gears
make the base curved:
save your file:
Read the sentences and tick True or False Gears work together and can transmit power and motion
What are gears and how do they work
Explain how the gears work on a bicycle
What is the importance of determining the center distance between two gears
Search the Internet to find applications which use involute gears. Describe two applications and explain the characteristics of involute gears
Use the tools from this unit to create the following model in FreeCAD. The following measurements will help you understand how each side is created.
Use the formula for the gear ratio to calculate the ratio for each combination of gears. Mark with a tick true which combinations of gears give increased speed and which give increased torque
