Iso 2768-2 Latest Revision Pdf
Eugene Hill
Special Containment Procedures: SCP-2768-1 is kept in a standard humanoid cell, equipped as a nursery. A team of pediatric physicians and nurses are to be kept available at all times for appropriate care needs.
SCP-2768-2 are kept in individual standard humanoid cells and allowed access to approved amenities and luxuries as rewards for good behavior. Instances of SCP-2768-2 are not allowed direct contact with one another outside of testing scenarios. Instances of SCP-2768-2 are not allowed within 100 meters of SCP-2768-1 under any circumstances. Non-violent anti-personnel techniques are sufficient to subdue SCP-2768-2 in the event of a breach.
Description: SCP-2768-1 is a white male infant with birth name Jameson Adrian MacDougal. SCP-2768-1 has the same nutritive and healthcare needs as a non-anomalous infant and displays no abnormal properties, with the exception that it does not physically age or develop. Despite being in Foundation custody for 17 years, SCP-2768-1 maintains the physical form of a newborn infant.
SCP-2768-2 is a collection of 37 white adult humanoids currently consisting of 35 males and 2 transgender females, with apparent ages ranging from late adolescence to elderly. Each instance is genetically identical to SCP-2768-1 and shares its unaging property. All instances identify themselves with a variation of or nickname related to the name Jameson Adrian MacDougal.
Instances of SCP-2768-2 are generally hostile towards each other and, if given the opportunity, will attack each other with homicidal intent. Instances of SCP-2768-2 do not display any abnormal or heightened physical attributes or capabilities. Should one instance succeed in killing another one, the deceased instance will vanish within 30 seconds. 24 hours following the death, a new instance of SCP-2768-2 will manifest between 15 and 100 meters of SCP-2768-1, with a personality and set of physical attributes that are hybrids or mixtures of those of the deceased and surviving instances. If an instance of SCP-2768-2 dies for any reason other than being killed by another instance, it will reappear between 15 and 100 meters of SCP-2768-1 24 hours later, unharmed and retaining all its pre-death memories.
Instances of SCP-2768-2 manifest in clothing appropriate to the current fashions of the United Kingdom. They additionally manifest carrying an individually specific handheld object, which appears thematically linked to the personality and mindset of that instance. They have varying degrees of emotional attachment to their associated objects, and will frequently request them or similar objects. Examples are listed below.
Aside from seeking to kill one another, all instances of SCP-2768-2 exhibit strong non-violent desires to make physical contact with SCP-2768-1. Stated purposes for this desire are generally highly possessive and protective, with reports that SCP-2768-1 belongs to that specific instance and that all others should be kept away or killed before they steal it. All instances of SCP-2768-2 are able to identify the exact location and physical status of SCP-2768-1 at all times and become distressed or agitated when they believe its care is inadequate.
SCP-2768 was discovered when, upon the birth of SCP-2768-1, the original 37 instances of SCP-2768-2 simultaneously appeared in varying locations within or near the hospital in which the birth occurred. Witness reports and surveillance video note that all instances manifested abruptly, and immediately proceeded towards SCP-2768-1. Instances engaged in hostilities with each other on sight, although several instances (notably SCP-2768-2f, -2l, and -2q) briefly cooperated to kill other instances before resuming hostilities against each other. In total, 12 instances were killed before hospital security personnel were able to apprehend them and deliver them to the custody of local authorities. Foundation personnel were dispatched to the scene within 24 hours and acquired all instances of SCP-2768-2, included newly replaced ones, with minimal disturbance. At this point the connection to SCP-2768-1 was discovered and it was also recovered without incident. The parents were informed that SCP-2768-1 had died of a congenital heart disease and were provided a cadaver resembling SCP-2768-1.
Every feature on products or parts has a size and a geometrical shape. To ensure that the size and geometry of all features are made as required, we should carefully take care of the tolerancing on the drawing. Nothing shall be implied or left to interpretation in the workshop or inspection department. General tolerances for size and geometry make it easier to ensure that the size and geometry of all features can be done as requested.
ISO 2768-mK means the dimension information for which the tolerances are not specified will be followed according to the m and K class. m class is specified in ISO 2768-1, and the K class is specified in ISO 2768-2, which includes H, K, and L tolerance levels.
ISO 2768-1 stands for the general tolerances for linear and angular dimensions without individual tolerance indications, ISO 2768-1 indicates the linear dimensions and angular dimensions such as external sizes, internal sizes, step sizes, diameters, radii, distances, external radii, and chamfer heights for broken edges. This standard covers general tolerances in three 4 classes of tolerance:
This general tolerance allows the manufacturer to choose the appropriate tolerance level that suits their needs best. For example, if the part is expected to be used in a project with high-level tolerance requirements, it would be wise to choose a small tolerance range. On the contrary, a larger tolerance range would be more cost-effective if the part is produced in high volumes for lower-level tolerance applications.
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The new ISO 22081:2021 standard, which replaces the previous ISO 2768-2:1996, specifies rules for the definition and interpretation of general geometric specifications and general dimensional mating specifications.
Due to the increased accuracy of measurement systems, the dimensional/geometric tolerance values given in engineering drawings are continually being reduced. The Geometrical Product Specifications (GPS) system is a pyramid structure that includes the basic standards, general standards, and application standards of the ISO system. At the top of the pyramid are UNI EN ISO 8015:2011 and UNI EN ISO 14638:2015, which define the rules for the GPS system: ISO 8015 defines the rules for the GPS system itself; the most important of which are the principle of independence (according to which each geometric specification in a technical drawing should be considered independently of the others), reference conditions (according to this standard the reference temperature, which gives the geometric tolerances given in the technical drawing, is 20C, as in UNI EN ISO 1:2022) and the principle of duality (according to which the specification and verification are independent of each other). In ISO 14638, the ISO matrix is given, which is divided into the specification, conformance and verification parts and which is given and appropriately calculated at the end of each ISO standard to identify its scope.
General tolerances (or general GPS specification paragraph 5.12 ISO 8015:2011), by specifying general dimensional and geometric tolerances, can simplify the instructions, thus making it easier to read the drawings, and at the same time facilitate the selection of tolerances. With regard to general dimensional tolerances, linear tolerances and angular tolerances (ISO 2768/1 standard), during the design stage, reference was always made to the four accuracy classes f, m, c, v and three tolerance classes H K L for decreasing straightness, flatness, perpendicularity, symmetry and Tolerance for circular eccentricity (ISO 2768/2 standard).
While not strictly necessary, the standard emphasizes the fact that it is always the responsibility of the designer to ensure the correct definition of product functional requirements, functional features, their correct and complete "dimensioning" as well as that of the entire component (so even NON-functional features must be limited in terms of allowable shape/orientation/position and dimension deviations). One must then always be aware that the use of general tolerances carries with it potential risks, such as overlooking some important functional requirements or assigning unnecessarily narrow tolerance values. Functional analysis of the product by the design team helps to mitigate such potential risks.
UNI EN ISO 22081:2021 establishes principles and rules for assigning general tolerances in engineering drawings. Although not strictly necessary, the standard emphasizes the fact that the designer must always ensure that the functional requirements, functional characteristics, correct and complete "dimensions" of the product as well as the whole assembly are correctly defined (so even non-functional characteristics must be limited in terms of orientation/position and dimensional deviations). In addition, one should always be aware of the potential risks of using general tolerances, such as ignoring some important functional requirements or assigning unnecessarily narrow tolerance values. A functional analysis of the product by the design team can help mitigate these potential risks.
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