Mechanical fit
Definition
The structural, dimensional, and functional relationship established following the assembly of two complementary parts (an encompassing one called a bore and an encompassed one called a shaft) that share the same nominal dimensions; by extension, the state of clearance or interference resulting from the actual difference in their dimensions prior to mounting. This micro-precise phenomenon is governed by rigorous standardized tolerances, determining exactly whether the components will move freely relative to one another or remain rigidly locked to transmit large mechanical forces within an industrial assembly.
Bilingual Equivalents
- Mechanical fit
- Fit tolerance
Grammatical & Source Details
| Inflection Type | Neuter noun with standard structural variations for plural and genitive cases. |
| Formation | Neological borrowing from the French noun 'ajustage', morphologically integrated into Romanian technical lexicons. |
| Spelling / Pronunciation | [a.ʒus.ˈtaʒ] |
| Source | Encyclopedia of Modern Industrial Metrics and Mechanical Design |
Contextual Usage Examples
RO: Inginerul a calculat un ajustaj cu strângere pentru a bloca rulmentul pe axul principal al turbinei.
EN: The engineer calculated an interference fit to lock the bearing onto the main shaft of the turbine.
RO: Dacă toleranțele nu sunt verificate la micrometru, un ajustaj defectuos poate bloca întregul angrenaj.
EN: If tolerances are not checked to the micrometer, a faulty fit can lock up the entire gear system.
RO: Standardele ISO definesc clase precise de ajustaj pentru piesele destinate industriei aerospațiale.
EN: ISO standards define precise fit classes for components destined for the aerospace industry.
Idioms & Phrases
Ajustaj cu joc / Clearance fit
RO: Tip de îmbinare în care dimensiunea alezajului este întotdeauna mai mare decât cea a arborelui, permițând mișcarea relativă a pieselor.
EN: A type of assembly where the bore size is always larger than the shaft size, allowing relative motion of the parts.
Ajustaj cu strângere / Interference fit / Press fit
RO: Îmbinare structurală în care arborele este mai mare decât alezajul, necesitând presare forțată sau dilatare termică la montaj.
EN: A structural connection where the shaft is larger than the bore, requiring forced pressing or thermal expansion during assembly.
Sistem de ajustaj / Fit system
RO: Ansamblu organizat de toleranțe și abateri standardizate care reglementează producția industrială de piese interschimbabile.
EN: An organized set of standardized tolerances and deviations regulating the industrial production of interchangeable parts.
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