Text-only reference. Published from the recorded official FAA General Chapter 11 PDF. Diagrams, photographs, and figure artwork are not reproduced here; use the official FAA PDF for those materials.
11-25 30 1 2 5 0 20 09876543210 30 1 2 5 0 20 09876543210 0 1 2 15 0 20 09876543210 0 1 0 10 5 09876543210 Barrel scaleVernier Scale 0.2944 0.2950 0.2153 0.1002 Example 1 Example 2 Example 3 Example 4 of the dial is then rotated until the needle is pointed at zero. The part is then rotated, and the amount of bend, or run out, is displayed on the dial as the needle fluctuates. The total amount of the fluctuation is the runout. Another common use for the dial indicator is to check for a warp in a rotating component, such as a brake disc. In some cases, this can be done with the brake disc installed on the airplane, with the base clamped to a stationary portion of the structure.
In either case, it is imperative that the dial indicator be securely fastened so that movement of the indicator itself induces no errors in measurement.
Slide Calipers
Often used to measure the length of an object, the slide caliper provides greater accuracy than the ruler. It can, by virtue of its specially formed jaws, measure both inside and outside dimensions. As the tool’s name implies, the slide caliper jaw is slid along a graduated scale, and its jaws then contact the inside or outside of the object to be measured. The measurement is then read on the scale located on the body of the caliper or on the LCD screen. [Figure 11-41] Some slide calipers also contain a depth gauge for measuring the depth of blind holes. 11-26 Vernier caliper Digital caliper Dial caliper