Figure 1: Micrometer. Micrometer screw gauge works on the principle of nut and bolt. It consists of an accurate screw with […]

Figure 1: Parkinson’s Gear Tester. Instead of measuring individual errors in gears, composite errors are checked. The composite error indicates

  Figure 1: Tool Maker’s Microscope. Tool Maker’s Microscope is a direct reading measuring instrument used extensively in the shop

Figure 1: Gear Tooth Vernier Caliper. The gear tooth thickness measuring vernier is as shown in Fig. 1. It measures