HOME WHO WE ARE TECHNOLOGY PRODUCTS NEWS SEARCH FOR CONTACTS TECHNOLOGY ALUMINUM: DISSIPATION COEFFICIENT MECHANICAL-CHEMICAL CHARACTERISTICS TYPES OF FINISHES TECHNICAL OFFICE TECHNICAL-MECHANICAL INFORMATION The tolerances on the nominal dimensions of the extruded profiles follow in detail the UNI 3879 (DIN 1748) standards. All machining dimensions without tolerance indication are subject to an average degree of precision UNI 5307. The threaded holes have a useful thread depth equal to at least twice their own diameter. As regards the geometric tolerances, the planarity value on the surfaces can be defined at a height of 0 +/- 0.05 mm / m. MEASUREMENT OF ROUGHNESS To introduce the concept of roughness measurement it is necessary to define some characteristic parameters (see figure 1): length of the measuring section L: it is the section of the technical profile on which the roughness measurements are carried out; mean line of the profile: it is the compensation line of the real profile, parallel to the technical profile, within the limits of the length L of the measuring section. Dictates y the deviations of the real profile with respect to the average line (measured orthogonally to this) and dictates x the distance on the average line between the point where the survey of the profile is started and the point where y is measured (see again Fig. 1), the mean line of the profile is defined as the line for which the relation is verified: L ∫ y dx = 0 0 Figure 1 - Ideal profile, real profile and technical profile according to UNI-3963 definitions. THE DEGREE OF FINISH OF THE MACHINED SURFACES La misura della rugosità è data dalla ampiezza R del valore medio aritmetico dei valori assoluti delle deviazioni y del profilo reale rispetto alla linea media: 1 — L L Ra = ∫ │y│dx 0 R per Rugosità a per media aritmetica Le misure di rugosità vengono espresse in µm. Si definisce grado di rugosità di una superficie il massimo valore di R tra quelli rilevati in punti diversi della superficie. TRE-S SRL - VIA DEL PROGRESSO, 26 36050 - SOVIZZO (VI) - ITALY TELEPHONE: +39 0444 551224 - FAX: +39 0444 376246 - EMAIL: tre-s@tre-s-srl.it - VAT: 02505070249 ^

HOME CHI SIAMO TECNOLOGIA PRODOTTI NEWS CERCA CONTATTI TRE-S SRL - VIA DEL PROGRESSO, 26 36050 - SOVIZZO (VI) - ITALY TELEFONO : +39 0444 551224 - FAX : +39 0444 376246 - EMAIL : tre-s@tre-s-srl.it - P.IVA : 02505070249 ^