Although the position of the bolt holes may fall within the quadrilateral ABcd range, for a specific value of 'a', some points within this range might still be unacceptable. For instance, if a point has an angle 'a' and the bolt hole is located at point 'm', it could be unqualified because the actual size P1 exceeds the tolerance range TFZ corresponding to the angle 'a'. This highlights the importance of considering both coordinate dimensions and angular values when inspecting the bolt hole positions.
In production measurement, two methods are commonly used for finished casings. The results from these measurements are calculated and verified, allowing for precise control of the production process. During the measurement process, the in-plane is adjusted on the platform so that the two stepped thread measuring axes (which can be replaced by a thread coaxial gauge) are screwed into the two bolt holes perpendicular to the platform. These axes then traverse the two jaws of the housing, ensuring the rod is leveled.
The shell A is leveled downward, and the 'b' value is indirectly measured using the two stepped thread axes and a bar that traverses the two jaws of the housing. The actual angle can be measured with an angle ruler. From the values of 'a' and 'b', along with known dimensions—such as the diameter of the step shaft of the deceleration top and the one-step thread measuring shaft, as well as the diameter of the measuring rod—the actual values Fl and Hl can be calculated.
The angle 'a', 'P', and 'Hl' values can be directly evaluated using the following formulas:
a = tanâ»Â¹(P / F), where â–³a is the tolerance for the angle 'a', â–³F is the tolerance for dimension 'F', and â–³H is the tolerance for the hole dimension 'H'. While this method is effective, it involves multiple steps, many measurement factors, and can lead to cumulative errors, resulting in less reliable outcomes. It also requires a high level of operator skill and takes longer to complete, making it more suitable for small-scale or single-piece production.
An alternative method uses measuring tools 1 and 2. Tool 1 consists of a ball-threaded rod and a base, while tool 2 includes a mandrel and a measuring plate. The design of these tools allows them to be mounted on the large end face of the casing and its two bolt holes, making the measurement process more convenient and the results more stable and reliable.
However, since the measurement direction does not align with the direction specified by the element being measured, the measured values must be converted. The angle 'a' and the length 'L' can be measured using tool 1, while the 'H1' dimension is measured using tool 2. The angles and dimensions obtained from these tools are not the actual values in the given coordinate system and need to be converted accordingly. The conversion formulas involve parameters such as the diameter of the ball head, the large end of the tapered portion, and various distances between key components.
Once the converted 'H1' and 'P' values, along with the measured angle 'a', are obtained, they must still be checked against the qualification formula. This method is simpler, faster, and less error-prone, with fewer measurement factors and better reproducibility. It does not require highly skilled personnel and is ideal for mass production.
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