Introduction To Usage Points And Precision Maintenance Of Granite Tri‑Square Ruler

As a core high-precision metrology tool in ultra-precision manufacturing, the granite tri-square ruler is widely used for precision calibration of semiconductor devices, CNC equipment, optical instruments and precision testing systems. Made of high-performance black granite, it features stable physical properties, low thermal expansion, no magnetization and permanent deformation resistance, outperforming ordinary marble measuring tools. Adhering to strict precision manufacturing concepts, ZHHIMG delivers high-stability granite tri-square rulers that meet global metrology standards. This article concisely introduces its standard usage and professional precision maintenance methods to stabilize measuring accuracy and extend service life.

Ordinary low-cost marble squares suffer from loose texture, easy wear and angular deviation, causing inaccurate measurement and affecting production precision. In contrast, ZHHIMG granite tri-square rulers adopt high-density black granite (≈3100kg/m³) with superior stability and wear resistance. Polished by professional ultra-precision equipment and polished by senior skilled workers, the product achieves 1μm precision and nano-level flatness, complying with DIN, ASME, JIS, GB and other international standards. All measurement data is traceable to national metrology institutions for reliable calibration results.

Granite tri-square rulers are precision measuring instruments that require standardized operation. Improper use will cause surface scratches, precision attenuation and angular deformation. Below are the simplified and core usage specifications for industrial and laboratory scenarios.

Before use, inspect the ruler’s working surface, right-angle edge and bottom base for scratches, chipping or dirt. Wipe all surfaces with a soft dust-free cloth and neutral cleaning agent, then air-dry thoroughly to avoid measurement errors. Ultra-precision measurement requires a constant temperature, constant humidity and vibration-free environment. Avoid using the ruler in high-temperature, humid or strongly vibrating environments to prevent thermal deformation and precision deviation.

Place the ruler stably on a calibrated horizontal base to ensure full, flat contact without tilting. Fit the right-angle surface closely to the measured workpiece with gentle, even force; avoid collision, extrusion and forced pressing to prevent internal stress and invisible deformation. Never drag or slide the ruler on workpiece surfaces to protect the nano-level precision surface from wear.

For high-precision scenarios such as semiconductor and laser equipment calibration, place the ruler in a constant temperature environment for 30–60 minutes in advance to balance temperature with workpieces and eliminate thermal errors. Follow corresponding international metrology standards during detection and keep complete test records to ensure result consistency and traceability.                                                                                                                                                                                                                                                                                                

Daily maintenance is critical to sustain the long-term precision of granite tri-square rulers. After each use, clean the surface thoroughly to remove dust, metal debris and stains, and store it in a dry, constant-temperature storage area, avoiding long-term exposure to high temperature and humid air. Do not stack heavy objects on the ruler or apply unilateral impact force.

Regular precision calibration is required for long-term use. Conduct periodic inspection of verticality and flatness with professional measuring equipment such as laser interferometers and electronic level meters. Timely professional re-grinding and calibration are needed once slight precision deviation occurs, to restore original measurement accuracy.

In long-distance transportation and handling, use professional shockproof packaging and soft cushioning materials to avoid vibration and collision damage. Reasonable use and standardized maintenance can effectively maintain the nano-level precision of ZHHIMG granite tri-square rulers and ensure stable and reliable measurement results for ultra-precision industrial production.