All Rights Reserved.Expressing Maximum Material Condition Using a Dynamic Tolerance Diagram The maximum material condition is used when designing two mating parts. In the past, the desired qualities would have been obtained by adding to drawings such expressions as ‘surfaces to be true with one another’, ‘surfaces to be square with one another’, ‘surfaces to be flat and parallel’, etc., and leaving it to workshop tradition to provide a satisfactory interpretation of the requirements.Geometrical tolerances are used to convey in a brief and precise manner complete geometrical requirements on engineering drawings. )It does not apply to flexible parts, subject to free-state variation in the unstrained condition.It does not apply to features of size which have a straightness tolerance applied to their axes or median plane.It may be overruled where a feature of size has a specified relationship between size and a geometric control, for example the use of It may be overruled with a statement such as ‘PERFECT FORM AT MMC NOT REQUIRED’ placed by a feature of size tolerance.ISO promotes (ISO 8015) the ‘Principle of Independency’ which states: ‘Each specified dimensional or geometrical requirement on a drawing shall be met independently, unless a particular relationship is specified.’ i.e. Geometrical tolerances shown in this book, in keeping with international conventions, must be met regardless of feature size unless modified by one of the following conditions:These dimensions are identified by enclosure in a rectangular box, e.g.
material limits of mating parts.
In other words, the maximum material requirement describes a gauge contour (at the toleranced feature(s) and at the The Late Dennis E. Maguire CEng, MIMechE, Mem ASME, REng.Des, MIED, in Colin H Simmons I.Eng, FIED, Mem ASME., ... Neil Phelps IEng MIED, MIET, in ScienceDirect ® is a registered trademark of Elsevier B.V. The maximum material condition is used when designing two mating parts. Maximum Material Condition From the size tolerancing we know that Maximum material condition (MMC) is the condition in which: • An external feature, like a shaft, is its largest allowable size. This gives a tolerance zone of 0.1 diameter.Shank at maximum material condition; head at minimum material condition. TED's are never individually toleranced but are always accompanied by a positional or zone tolerance specified within the tolerance frame referring to the feature (see The upper and lower limits of size are 20.1 and 19.9 mm, respectively.The limits referred to above can be set in two ways:the space between two equidistant lines or two parallel straight lines;the space between two equidistant surfaces or two parallel planes;The tolerance applies to the whole extent of the considered feature unless otherwise specified.Geometrical tolerances are indicated by stating the following details in compartments in a rectangular frame:the characteristic symbol, for single or related features;preceded by Ø if the zone is circular or cylindrical,letter or letters identifying the datum or datum systems.Indications qualifying the feature within the tolerance zone should be written under the tolerance frame (see If it is necessary to specify more than one tolerance characteristic for a feature, the tolerance specification should be given in tolerance frames positioned one under the other as shown in The width of the tolerance zone is in the direction of the leader line arrow joining the symbol frame to the toleranced feature unless the tolerance zone is preceded by the symbol Ø.
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