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Help CenterHigh Precision 000 Grade Marble Measurement Inspection Test 90 Degree Granite Square Ruler; Flat Ruler; Angle Ruler
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Core Functions and Applications
1. Reference Function (Core Purpose)
· As a benchmark for ideal angles: The "two working surfaces" of the granite square are precision-machined to form a 90-degree angle. This angle serves as the starting point or reference for measurements.
· As a benchmark for ideal planes: Its working surface is a highly flat surface, which can be used as a reference plane for checking flatness.
. Inspection Function
· Inspecting perpendicularity: This is the most important function. The edge of the workpiece to be inspected (such as machine tool guide rails, side faces, molds, etc.) is pressed against the working surface of the square, and by observing the light gap (using a knife-edge ruler) or using aer gauge and a dial indicator to measure the gap size, the perpendicularity error between the two faces of the workpiece can be determined.
· Inspecting straightness and flat: The working surface of the square is brought into contact with the surface to be inspected, and by observing the light gap, the straightness or flatness of the inspected surface can roughly determined.
· Marking and positioning: On a precision assembly or marking platform, it can be used as a guide benchmark for marking or positioning the workpiece in a direction.
Why choose granite (natural rock) for manufacturing?
This is the key to the outstanding performance of granite squares, and its material properties determine its irreplace advantages:
1. Extremely high stability (long-term stability):
· Granite is a naturally aged natural stone formed over hundreds of millions of years, with stresses completely eliminated. It hardly deforms or experiences stress release due to time or changes in ambient temperature. This ensures its long-term precision stability, far superior to metal squares.2. High precision:
· High-quality granite (such as "Jinan Blue") has a dense structure and uniform grains, making it easy to grind and to an extremely high precision (up to grade 00 or even higher).
3. High hardness and wear resistance:
· With a high Mohs hardness, is not easily scratched or worn, ensuring a long service life.
4. Non-magnetic and insulating:
· It is not affected by magnetic fields and does not electricity, making it suitable for special environments.
5. Corrosion resistance:
· Resistant to acids, alkalis, and oil, does not rust, and easy to maintain (just needs cleaning, no need for oiling).
6. Small coefficient of thermal deformation:
· Insensitive to temperature changes and has a much dimensional change due to ambient temperature than metal.
Main Application Fields
· Precision Machinery Manufacturing Industry: Inspecting the perpendicularity and flatness of machine tool workben, guide rails, spindle boxes, etc.
· Mold Industry: Inspecting the perpendicularity and position of mold templates, mold cavities.
· Automobile Manufacturing Industry:ing key components such as engine block, transmission case, etc., for shape and position tolerances.
· Scientific Research and Measurement Units: Used as a transfer tool for and angle measurements.
· Quality Control (QC): Quick inspection of key workpieces on the production line
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