maximum material condition on datumBlog

maximum material condition on datum

For example, the position of a hole has a tolerance of .020 inches.

Refer to "ASME Y14.5-2009 Dimensioning and Tolerancing" section 4.11.6, "Determining Size of Datum Feature Simulators at MMB", and succeeding sections on …

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. Maximum material condition (MMC) Provides bonus tolerance only for a feature of size ... A datum feature is a physical feature of a part identified by a datum feature symbol and corresponding datum feature triangle, e.g., − − | These are then referred to by one or more 'datum references' which indicate measurements that should be made with respect to the corresponding datum feature . We could use a pin gage that mimics the lower limit of the hole. Our example replicates the case in the Figure 2.15 in the ASME Y14.5-2009 standard (page 33) in a 3D context with much larger tolerances (and errors) to better visualize the concepts. Maximum material condition (MMC) is that condition of a part or feature which contains the maximum amount of material.Head at maximum material condition; shank at minimum material condition.
This means the hole can move ±.010 inches, which is an equal bilateral tolerance.

Use material condition modifiers in GD&T measurements to specify how the tolerance zone is affected by other tolerances that apply to a feature or datum feature. Other times the feature size (maximum, or minimum) is not critical to the function, so no material modifier is used. It does not mean the hole can move +.015/−.005 inches, which is an unequal bilateral tolerance. Now the considered hole must not violate its 4.7 dia Virtual Condition boundary at the same time that the datum holes are not violating their 10 dia Virtual Condition boundaries. The boxed symbols can be read “the position of these two holes may vary within a cylindrical tolerance zone of 0.1 relative to datums A, B, and C when the holes are at their maximum material condition”. Gaging Maximum Material Condition. There are several standards available worldwide that describe the symbols and define the rules used in GD&T. Note that now the considered hole is called out MMC (Max Material Condition), and the datum is referenced MMB (Max Material Boundary). 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.
These are then referred to by one or more 'datum references' which indicate measurements that should be made with respect to the corresponding datum feature . In other words, the gage controls the Max Material Condition of the part for that hole since MMC for a hole is the minimum diameter. The quality of the product is attained by these three contributors with the perfect agreement. The maximum material principle takes into account the mutual dependence of tolerances of size, form, orientation and/or location and permits additional tolerance as the considered feature departs from its maximum material condition. (Note: The rules above are not the exact rules stated in the ASME Y14.5-2009 standard.)

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