Most end‑users only focus on the final accuracy parameters of granite support blocks, yet they seldom realize that a qualified high‑precision support block is produced by a complete and interlocked process chain. Simplifying or omitting any procedure will lead to hidden troubles such as accuracy drift and deformation failure in later service. Many low‑cost products on the market cut corners by skipping aging treatment, constant‑temperature fine machining and manual precision lapping. They are simply cut and polished and then falsely marketed as high‑precision parts. Drawing on years of manufacturing experience for ultra‑precision components, UNPARALLELED Group fully breaks down the full‑flow process of high‑precision granite support blocks from raw stone to finished goods, and demonstrates the rigorous manufacturing logic behind reference components.
The first procedure is raw‑material screening and pre‑aging, the source of all accuracy. Not all granite blocks are suitable for manufacturing high‑precision support blocks. Incoming raw materials are first inspected for internal defects, and stones with hidden cracks, interlayers, pores and uneven mineral distribution are eliminated. Selected UNPARALLELED® black granite blocks are stored in a special stone yard for long‑term static placement to release geological residual stress generated during mining and cutting. This step cannot be rushed into subsequent processing. If internal stress of the stone is not fully released, even products with qualified accuracy after machining will deform slowly in service. Physical property re‑verification is carried out at the raw‑material stage to confirm key indicators including density, thermal expansion coefficient and hardness, fundamentally preventing ordinary marble from being passed off as precision granite.
The second procedure is rough cutting and blank forming. With heavy‑duty cranes and CNC sawing equipment, aged raw blocks are cut with water cooling. Temperature rise is strictly controlled during cutting to avoid introducing new internal stress from friction heat. In rough machining, dimensions are not directly machined to finished sizes. Reasonable finishing allowance is reserved for all surfaces, and chamfering and chipping removal are completed. After rough machining, blanks are not sent directly for fine grinding. Instead, they go through static aging once again to release mechanical stress induced by sawing. This secondary stress‑relieving step is commonly omitted by small workshops.
The third procedure is semi‑precision grinding and functional structure machining. Blanks are transferred to the production workshop for semi‑precision grinding on large CNC grinders. Saw marks are gradually removed to establish basic reference planes, with preliminary control over parallelism and perpendicularity. According to customer drawings, functional structures such as mounting holes, counter‑sinks and embedded steel sleeves are processed synchronously. Hole‑opening and insert assembly will change local stress conditions of the stone. Workpieces shall be statically placed again after structural machining to eliminate partial stress and avoid local stress concentration that may affect reference planes.
The fourth procedure is ultra‑precision grinding inside a Class‑10000 constant‑temperature, constant‑humidity and vibration‑isolated workshop, which determines the geometric tolerance of finished products. The workshop floor is poured with extra‑thick concrete, equipped with vibration‑isolating trenches to block external vibration. Silent travelling cranes reduce internal disturbances and maintain stable temperature and humidity, minimizing environmental impacts on machining accuracy. Progressive fine grinding is performed by high‑end heavy‑duty CNC grinders. Grinding stock removal is strictly controlled together with grinding heat to prevent micro‑deformation of stone caused by local temperature difference, bringing flatness and parallelism down to the micron level. Although mechanical grinding can deliver decent basic accuracy, it has inherent limitations. Local high spots and micro‑ripples require correction via manual lapping.
The fifth core procedure: manual precision lapping and correction by senior craftsmen. After mechanical processing, craftsmen with decades of practical lapping experience carry out cross manual lapping. Abrasives of different grain sizes are applied for repeated finishing of reference surfaces, with micro‑material removal for local high spots to fix machine‑resistant local errors such as bulging centers and sunken edges of large‑size workpieces. Leveraging long‑term accumulated feel and repeated comparison with measuring instruments, craftsmen push flatness and parallelism to micron‑ even nanometer‑level. Manual lapping generates no machining heat and better guarantees long‑term service stability, making it an irreplaceable process for high‑end granite support blocks. After lapping, all lapping media are thoroughly cleaned to prevent scratches on working reference surfaces. Workpieces are kept isothermally static under constant‑temperature conditions for full balance of temperature and stress.
The sixth procedure is multi‑dimensional metrological inspection and data traceability. Final factory inspection shall be conducted after isothermal static placement instead of immediately after lapping. A full set of imported metrological instruments including laser interferometers, electronic levels and roughness testers are adopted for item‑by‑item inspection of flatness, parallelism, perpendicularity, appearance and roughness. All inspection instruments hold calibration certificates issued by legal metrology institutes with traceable measurement results. Products comply with DIN, ASME, JIS, GB and other international standards. Multi‑point scanning is adopted instead of simple spot‑check sampling. Inspection data of each support block are fully recorded to form product files. Non‑conforming parts will be returned for re‑lapping instead of direct release.
The seventh procedure is cleaning & protection, final re‑inspection and packaging & delivery. Qualified support blocks are surface‑protected to avoid scratches and collision damage during transportation. Finished products go through final re‑check to confirm appearance, dimensions and accuracy fully meet order requirements. Shock‑absorbing protective packaging is applied to prevent damage in logistics. 
As can be seen from the whole process, accuracy of high‑precision granite support blocks is not achieved by single equipment, but by joint effects of raw‑material screening, multi‑stage aging, graded grinding, manual precision lapping, constant‑temperature environment and closed‑loop metrology. Shortening aging cycles, skipping constant‑temperature processing and omitting manual finishing can lower production costs yet sacrifice long‑term product stability.
UNPARALLELED Group owns large‑scale production sites and an independent stone storage yard, with manufacturing capacity for heavy‑duty and large‑size granite components. The enterprise holds ISO three‑system certifications, CE certification and more than 20 international trademarks and patents. The above‑mentioned complete process system is fully implemented. Besides granite support blocks, the company also supplies granite machine beds, air‑bearing guide bases, precision ceramics, mineral castings, UHPC, carbon‑fiber precision beams and other ultra‑precision components, serving Fortune Global 500 enterprises, metrology institutes and top universities worldwide. Adhering to the customer commitment of no cheating, no concealment and no misleading, as well as the quality policy that no demand is too strict for precision industry, UNPARALLELED delivers stable and reliable reference load‑bearing components for semiconductor, metrological inspection, laser, new‑energy and other industries with mature and complete manufacturing technology.