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Tolerances can be expressed directly on a dimension by limits, plus/minus tolerances, or geometric tolerances, or indirectly in tolerance blocks, notes, or tables. Geometric tolerances are described by feature control frames, which are rectangular boxes on a drawing that indicate the type of geometric control, tolerance value, modifier(s) and ...
The prism fusion range (PFR) or fusional vergence amplitude is a clinical eye test performed by orthoptists, optometrists, and ophthalmologists to assess motor fusion, specifically the extent to which a patient can maintain binocular single vision in the presence of increasing vergence demands.
Engineering tolerance is the permissible limit or limits of variation in: a physical dimension ; a measured value or physical property of a material, manufactured object, system, or service;
Tolerance analysis is the general term for activities related to the study of accumulated variation in mechanical parts and assemblies. Its methods may be used on other types of systems subject to accumulated variation, such as mechanical and electrical systems.
Useful Tolerances Nominal Diameter (mm) Tolerance over 0 to 3 over 3 to 6 over 6 to 10 over 10 to 18 over 18 to 24 over 24 to 30 over 30 to 40 over 40 to 50 over 50 to 65 over 65 to 80 over 80 to 100 over 100 to 120 Shafts c11 −0.060 −0.120 −0.070 −0.145 −0.080 −0.205 −0.095 −0.205 −0.110 −0.240 −0.120 −0.280 −0.130
A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks. It is widely used in surveying and construction to measure height differences ...
Mining. Total stations are the primary survey instrument used in mining surveying. A total station is used to record the absolute location of the tunnel walls, ceilings (backs), and floors, as the drifts of an underground mine are driven. The recorded data are then downloaded into a CAD program and compared to the designed layout of the tunnel.
For a thin prism, the deviation of violet light, is and that of red light, is (). The difference in the deviation between red and violet light, ( δ v − δ r ) = ( n v − n r ) A {\displaystyle (\delta _{v}-\delta _{r})=(n_{v}-n_{r})A} is called the Angular Dispersion produced by the prism.
Soldier using a prismatic compass to get an azimuth. A prismatic compass is a navigation and surveying instrument which is extensively used to find out the bearing of the traversing and included angles between them, waypoints (an endpoint of the course) and direction. [1] Compass surveying is a type of surveying in which the directions of ...
In graph theory, a tolerance graph is an undirected graph in which every vertex can be represented by a closed interval and a real number called its tolerance, in such a way that two vertices are adjacent in the graph whenever their intervals overlap in a length that is at least the minimum of their two tolerances. [1]