The PROJECTA-SET method to adjust the tapered roller bearing clearance is similar in concept and application to the ACRO-SET method, but it adds extra variety and complexity by using special measuring fixtures. This kind of measuring tool can project the unmeasurable gasket, spacer gap or reference surface to a place that is easy to measure. This kind of gauge is usually used for reading dial gauges or LVDTs. It is also very suitable for the design of adjusting parts (inner or outer ring) with tight fit without sacrificing assembly speed or accuracy. The method (Figure 12) includes two important measuring tools: a spacer sleeve (reference C) that is usually equal to the known design length (reference X) and a cone measuring sleeve (reference D). These sleeves will project the inaccessible spacer gap to the shaft end. To illustrate the PROJECTA-SET method, please refer to a typical main minus shaft assembly (Figure 13). In this back-to-back inner ring adjustment design, the bearing clearance is obtained by using a spacer ring between the small end faces of the two inner rings. In this application, the outer ring and inner ring have a slight tight fit. The required measurement steps are: 1. Place the assembled drive gear shaft (except the upper inner ring and spacer) on the lower pressure plate. Place the measuring tool on the outer ring of the upper bearing and then into the upper inner ring (Figure 13). 2. Apply pressure to clamp the measuring tool with two bearing inner rings. At this time, the known axial load can be transmitted to the measuring tool with the help of the internal butterfly spring. (Note: The purpose of applying pressure is only to clamp the upper inner ring in a proper position, leaning against the spacer sleeve, so that the bearing is seated correctly. Some measuring tools achieve this function through a nut). 3. Swing the measuring instrument (handle) to seat the bearing rollers in place. The LVDT probe measures the axial displacement between the two gauges, and the digital display shows the reading of the required spacer size. 4. Use a measuring tool to determine the size of the spacer ring according to the following equation (Figure 13): S u003d Z-A + K where: S u003d the size of the spacer ring required, Z u003d the length of the sleeve (fixed value) A u003d inner ring and outer ring The variable distance between two corresponding diameters on the cone of the positioner.　(The size of the zero adjustment is known) K u003d constant, which compensates for the system deviation caused by the gage spring load, the average inner ring fit effect (clearance loss) and the required bearing clearance G u003d the measured value of the clearance, which represents the change in distance A. Distance A includes special considerations for the GPROJECTA-SET method: 1. The size, weight, cost, and design of the PROJECTA-SET measuring tool should be checked for specific applications. Typical measurement costs for industry applications, including LVDTs and internal gage springs, are about US$10,000 each. In order to improve the efficiency of setting the clearance, the designer should consider the use of a special automatic pressurization design and the use of pressurization fixtures in the measurement of more than 30,000 assembly times per year. 2. If different bearing series and different types of shafts are used in the same application, then separate measuring instruments or interchangeable parts (ie, double cones) need to be used. 3. It is only an alternative to setting the clearance for tapered roller bearings (ACRO-SET is similar to PROJECTA-SET and should be considered first). Advantages of the PROJECTA-SET method In applications where the inner ring or outer ring is tightly fitted, time-consuming disassembly can be avoided when replacing the gasket or spacer. It can be easily applied to the automatic assembly process compared to the traditional manual method in the past, which reduces the manual judgment to a minimum The degree of training required to use the PROJECTA-SET measuring tool is the shortest. The PROJECTA-SET method can provide a consistent and reliable setting of the clearance.