Advantages and Applications of Granite Comparison Table (Comparison Platform / Comparison Table)
A granite comparison table is a specialized comparison inspection device integrated with a high-precision granite platform as the base body, equipped with components such as micrometers, dial indicators, dial test indicators, indicator holders, and limit blocks. It is also commonly referred to as a comparison measurement table or error comparison table. It primarily focuses on rapid batch inspection, dimensional comparison, and tolerance sorting, and is widely used in the full inspection, sampling inspection, and sorting processes of precision parts.
I. Core Advantages (Compared to Cast Iron Platforms and Simple Tooling)
- High Reference Accuracy and Extreme Stability
Made of high-quality granite such as Jinan Green, it undergoes long-term natural aging to completely release internal stresses, ensuring no deformation or subsidence during long-term use.
Extremely low thermal expansion coefficient: minor fluctuations in workshop temperature and humidity will not affect the accuracy of the reference plane, ensuring measurement consistency around the clock.
The working surface is precision ground to achieve Grade 00 / Grade 000 accuracy, meeting micron-level comparison requirements. - Material Properties Suited for Industrial Scenarios
Non-magnetic and non-conductive: It can directly inspect magnetic workpieces without attracting iron filings, avoiding scratches to the workpieces and the reference surface.
Rust-proof, oil-resistant, and resistant to cutting fluid corrosion: It can be used in machining, grinding, and cleaning workshops, with simple maintenance.
Hard and wear-resistant texture: Repeated placement and sliding of workpieces are unlikely to cause scratches or bump damage. - Good User Experience and Suitability for Batch Operations
The surface is fine and smooth, allowing workpieces to be pushed and pulled smoothly, with inspection efficiency far higher than measuring each piece with a single measuring tool.
The tabletop is flat and has good load-bearing capacity, allowing the installation of limit blocks, positioning fixtures, and multiple sets of indicator stands to achieve simultaneous inspection at multiple stations.
Sufficient overall rigidity: No vibration or displacement during inspection, ensuring high data repeatability. - Низкая стоимость обслуживания
No need for regular oiling or rust prevention treatment; daily maintenance only requires wiping off iron filings and oil stains from the surface. The accuracy is durable, and the service life far exceeds that of cast iron comparison tables. - Convenient Installation
Integrated one-piece structure: It can be used immediately after placement and leveling, without the need for complex fixing, and can be flexibly arranged in production lines, quality inspection areas, and packaging areas.
II. Main Application Scenarios
- Component Dimension Comparison and Tolerance Sorting (Primary Use)
Using standard / qualified parts as a benchmark, batch compare the dimensional deviations of workpieces from the same batch, quickly determine whether the product is within the tolerance range, and achieve sorting of qualified defective products.
Shafts, pins, ejector pins, guide pillars: detect differences in total length, step height, and outer diameter dimensions;
Bushings, bearings,-type parts: compare inner diameter, thickness, and end face height;
Small hardware, precision electronic components, fasteners: batch dimensional screening. - Rapid Detection of Form Position Errors
Equipped with dial indicators and limit blocks, rapidly detect workpiece end face runout, radial runout, flatness, parallelism, and perpendicularity:
Motor shafts,, tool shanks: rotate the workpiece to detect circular runout;
Flanges, disc-type parts: detect end face parallelism and end face runout;
Sheet metal small enclosures: compare parallelism on both sides. - Online Full Inspection / Patrol Inspection on Production Lines
Integrated beside the assembly line or at process stations, operators can pick and at will, control the processing quality of each process, prevent defective products from flowing into the next process, and adapt to automated and semi-automated production lines. - and Tooling Component Inspection
Mold guide pillars, guide bushings, ejector pins, inserts, circular electrodes, and other components, uniformly compare dimensions and form and position tolerances to ensure assembly accuracy; also used for component verification during mold maintenance. - Calibration of Measuring Tools and Standard Parts
Used as a simple calibration platform in metrology rooms and quality inspection: using the high-precision plane of the comparison table as a benchmark, verify the accuracy of small-specification flat rulers, gauge blocks, dial indicator stands, and small measuring tools - Scientific Research, Laboratories, and Third-Party Testing
As a standard comparison benchmark, used for sample comparison, experimental data collection, and third-party quality inspection sampling with stable and traceable data.
III. Common Combinations
Basic Model: Granite comparison table magnetic dial indicator stand dial indicator / digital indicator limit block (singlestation inspection)
Batch Model: Granite comparison table multiple sets of indicator stands positioning fixtures (multi-station synchronous inspection)
Combination Inspection: Comparison table granite V- → specifically used for runout and dimensional comparison of various cylindrical shaft parts
IV. Applicable Industries
Machining, mold manufacturing, bearing industry, motor / auto parts, precision electronic, hardware fasteners, cutting tools, automated equipment components, etc.
