Introduction and Application: Tablets are generally used as reference positioning surfaces in calibration or precision testing.experimental platformSuitable for testing the flatness of workpiece surfaces using the coloring method, or as an auxiliary tool for experimental work. Regulations on stiffness index of experimental platform When a load of 250N (1N=0.102kgf) is applied in the center of the working face of the experimental platform, the deflection of the flat plate should not exceed 1m. During the test, the deflection values of each level of flat plate should not exceed half of the flatness tolerance value of the 00 level flat plate. The specific indicators of the rated load and allowable deflection values applied to various specifications of experimental platforms in the concentrated load area in the center of the working face are shown in the table below.

Specification/mm × mm	Diagonal d	Circle with concentrated load area D	Rated load/N	Allowable deflection value/m
/mm
160×100	189
160×160	226
250×160	297
250×250	353	120	375	1.5
400×250	472
400×400	566	500	2
630×400	746
630×630	891	190
800×800	1131
1000×630	1182
1000×1000	1414	625	2.5
1250×1250	1768	300	750	3
1600×1000	1887
1600×1600	2262
250×1600	2968	1000	4
4000×2500	4717	1500	6

Technical data of experimental platform: manufactured according to GB/4986-85 standard, using grinding technology for the working surface, used for grinding of parts, repairing measuring tools. The surface roughness Ra of the parts ground with this product is ≤ 0.08 μ m, generally small in size and weight, with specifications ranging from 100 × 100-800 × 600, about 30-50 kg, mainly used as a cushion plate for molds