Granite Square Ruler

A granite square ruler is a specialized precision measuring tool used in various industries for checking and ensuring right angles and squareness. Here is a detailed overview:

Characteristics

High Precision: It is designed to provide accurate 90 - degree angles with minimal deviation. The manufacturing process involves precise grinding and calibration to ensure that the angle between the two arms of the square ruler is within a very tight tolerance, usually within a few arc - seconds or fractions of a millimeter over the length of the ruler.

Stable and Durable: Made from high - quality granite, it offers excellent stability. Granite has a low coefficient of thermal expansion, which means it is less affected by temperature changes, maintaining its accuracy in different environmental conditions. Additionally, granite is highly resistant to wear, corrosion, and mechanical deformation, ensuring a long service life.

Flat and Smooth Surface: The surfaces of the granite square ruler are extremely flat and smooth. This not only allows for accurate measurement but also provides a good contact surface when used to check the squareness of workpieces. The flatness is typically controlled within a few micrometers, ensuring reliable and consistent measurements.

Applications

Metalworking and Machining: In metal fabrication and machining processes, the granite square ruler is used to check the squareness of machined parts, such as the corners of blocks, the edges of plates, and the intersections of different surfaces. It helps ensure that the parts are manufactured to the correct specifications and that the angles are precise, which is crucial for the proper assembly and functionality of the final products.

Woodworking: In woodworking, especially in the production of high - quality furniture and cabinetry, the granite square ruler is used to check and mark right angles for cutting, joining, and assembling wooden components. It helps ensure that the corners of cabinets, frames, and other wooden structures are perfectly square, resulting in a more stable and aesthetically pleasing finished product.

Construction and Masonry: In construction and masonry work, the granite square ruler is used to check the squareness of building corners, walls, and foundations. It is an essential tool for ensuring the structural integrity and accuracy of buildings. For example, when laying bricks or constructing concrete structures, the square ruler is used to ensure that the corners are at right angles, which is crucial for the stability and alignment of the entire structure.

Quality Control and Inspection: In quality control departments of various industries, the granite square ruler is used as a standard tool for inspecting the squareness of products. It helps identify any deviations from the required 90 - degree angles, allowing for timely correction or rejection of defective parts. This ensures that the final products meet the highest quality standards.