Concepts

1. Blueprint Reading - 2.5 Hours. [Youtube]
Understanding blueprints is critical to a successful inspection. This topic covers the basic aspects of blueprints including the Titleblock, Tolerances, Drawing Views, Notes, Revisions, and more. The middle of the video also discusses some of the reasoning behind different blueprint styles and how blueprints define requirements. Other topics include some basic shop math, holes, identifying GD&T requirements (covered in more detail in another video), Unilateral Tolerances, Implied requirements, and wrap up with some best practices.


2. Vernier Scale - 1 Hour [Youtube]
This topic covers in-depth how to use and read the vernier scale. This precision scale is used in many common gages such as micrometers, calipers, and height gages. The linear scale for calipers is demonstrated as well as the rotational scale with a micrometer. Both scales involve counting lines and adding different readings together to get the final measurement. It may not be as easy as digital readouts, but its still very accurate, very common, and cost effective. An essential skill for anyone working in metrology and inspection.


3. Gage Accuracy, Precision, R&R - 40 Minutes [Youtube]
This topic explores the accuracy, precision, and repeatability of gages. Understanding these aspects of gages helps us choose a tool and investigate if a reading is correct.


4. Inspection Error - 45 Minutes [Youtube]
This topic explores all the different sources of error during an inspection and how to avoid them, mitigate them, or control them. The sources discussed include error from the gage, part, environment, and human errors. In precision manufacturing, minimizing all error is very important for accurately inspecting and dispositioning material.


5. Gage Selection - 1 Hour [Youtube]
Armed with our knowledge of blueprint, gages, and error, we can dive into selecting the proper gage. This topic will teach you what to consider and how to balance the trade-offs in more challenging situations. Choosing the right gage using a methodical criteria can be the difference between passing or failing a part. Gage selection also factors into cost and how much money/resources/time is invested into an inspection. Another critical skill for inspectors.



6. Variable vs. Attribute - 30 Minutes [Youtube]
This topic is strongly related to gage selection and highlights some key benefits and drawbacks to particular gages. It focus on whether you set up for pass/fail inspections or want a measured value relative to the tolerance zone. Both have pros and cons and best practices to employ.


7. Calibration and Traceability - 1 Hour [Youtube]
Each gage video covers how to calibrate or verify the calibration of that gage. This video looks at the calibration system in general. How they are designed, requirements, steps for implementation, and how to optimize for accuracy and cost. Gages not properly calibrated on an acceptable cycle leads to parts out of spec and costly rework or scrap.