Broken-out & Aligned Sections

In this lesson, I cover two advanced types of section views used in technical drawings: the Broken-out Section and the Aligned Section. I explain that the Broken-out Section allows us to expose internal features without cutting an entire view in half, by drawing a short break line (a thick, squiggly line) and then hatching the area behind it [01:16]. This is particularly useful for dimensioning hidden features, as one of our dimensioning rules is not to dimension to a hidden line [02:42]. For the Aligned Section, which is used on symmetrical, non-orthographic features like bolt circles, the cutting plane line bends or "aligns" to pass through the features [03:02]. I demonstrate how to draw this type of section by revolving the cut features down to the horizontal axis before projecting them onto the section view [06:04], which results in all features being visible in their true radial distance. I also briefly review the rule for ribs and spokes, reminding you not to section them when the cutting plane is passing through them lengthwise [07:09]. Video Chapters [01:16] Introduction to the Broken-out Section using a thick short break line [02:42] The main reason for using a Broken-out Section: Dimensioning hidden lines [03:02] Introduction to the Aligned Section for symmetrical, round parts [04:10] Showing how the cutting plane bends to pass through features like holes [06:04] Demonstration of projecting the aligned features using a compass/arc [07:09] Review of the rule for not sectioning Ribs (and Spokes)