3. Advanced reference systems
3.1 Tightening or favorable and unfavorable play
Schematically, a connection is clamping if the shaft is larger than the bore, with pressure and deformation distributed around the surface. The least-squares axes are assumed to coincide.
A loose connection is one in which the shaft is smaller than the bore. This clearance allows a small degree of mobility between the two parts. This clearance can be favorable for a single requirement and implicitly unfavorable for other requirements, as it is impossible to move the part in two different directions to meet two different requirements.
For example, in a conventional assembly with a primary plane, a secondary centering device with clearance and a tertiary...
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Advanced reference systems
Situation elements
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