Lesson 3: Heavy Machinery & Fabrication Basics
Duration of Days: 5
Lesson Objective
SWBAT:
Perform a basic tack weld using a MIG welder on a steel chassis sample.
Operate a mill to square an edge or drill a precision-located hole for a motor mount
How does fabrication (making parts) differ from repair (fixing parts)?
What is the relationship between machine speed (RPM) and the material being cut?
MIG (Metal Inert Gas), TIG (Tungsten Inert Gas), Mill, Lathe, Spindle, Feed Rate, Workholding, Collet, Chuck, Slag, Shielding Gas.
CT-CTE.MFG.F.35: Demonstrate operation of the vertical milling machine.
DOK Level: 3 (Strategic Thinking/Hands-on)
Students gain exposure to the "Power Tools of the Trade." The purpose is to build confidence in using the MIG/TIG welder, Mill, and Lathe for vehicle customization.
Misconception: "The faster the machine spins, the faster I can get the job done."
Correction: Demonstrate how excessive speed burns out drill bits and ruins the workpiece
Support: Use "Shadowing" by having a student observe a partner for 10 minutes before touching the machine controls.
Extension: Students use the Lathe to "turn down" a shaft to a specific diameter for a wheel bearing
Machine Pass-off Rubric: Evaluated performance on a mill and welder, focusing on safety, setup, and cleanup