Contents
What is Max material condition?
Maximum Material Condition (MMC) and Least Material Condition (LMC): Simple Definitions. MMC is the condition of a feature which contains the maximum amount of material, that is, the smallest hole or largest pin, within the stated limits of size.
What does flatness mean in GD?
Flatness is a measure of a surface’s form compared against itself, indicating that all the points along the surface lie in the same plane. Symbolized in GD by a parallelogram, flatness allows you to limit waviness or variation in a surface without tightening its dimensional tolerance.
How do you find the maximum material condition?
For an feature of size specified at MMC, Resultant Condition = LMC + Geometric Tolerance allowed. This is a single tolerance and size event.
What is maximum material limit of hole?
Explanation: Maximum material limit of hole is smallest diameter of hole. Minimum material limit of hole is largest diameter of hole. Explanation: Minimum material limit of shaft is minimum diameter of shaft. Maximum material limit of shaft is maximum diameter of shaft.
What is the least material condition?
Least Material Condition (LMC) is that condition of a part or feature which contains the minimum amount of material, e.g. maximum size hole or a minimum size shaft. Circumstances do arise where, for example, a designer would want to limit the minimum wall thickness between a hole and the side of a component.
Where is flatness used?
When Used: Usually, flatness is used to give a surface an even amount of wear or for sealing properly with a mating part. Commonly used on a fixture that must mate flush with another part without wobbling, but where orientation is not important.
What is Max material boundary?
The maximum material boundary concept is simply the use of a maximum material condition on a datum feature, as shown in Figure 1 (the annotation B(M)). Its major use is to allow easier assembly conditions on a part.
What does the M mean in GD?
Maximum Material Condition
Maximum Material Condition is one of three features of size callouts in GD. The other two are Least Material Condition and Regardless of Feature Size. All of these specify the condition that the part or feature must be in to apply the specified geometric tolerance.
What is another word for flatness?
In this page you can discover 36 synonyms, antonyms, idiomatic expressions, and related words for flatness, like: blandness, smoothness, asepticism, colorlessness, drabness, dreariness, dryness, dullness, flavorlessness, insipidity and insipidness.
How is flatness calculated?
Flatness is can be measured using a height gauge run across the surface of the part if only the reference feature is held parallel. This is a 3D measurement so points must be measured across the length and width of the part to ensure the entire surface is in tolerance.