Today I want to discuss about most important thing in any type of industry which is Geometric Tolerance. Anyone part can’t be made in correct manner. Tolerance is used to control the variations that exist to all manufactured parts. Tolerance dimensions control he variations on each part of assembly.

One of the most points is that all parts of any kind should be in correct manner so that when all parts matched each other in any country of the world they should do proper function. This is the main requirement of any progressive industry.

• Tolerance tells us that parts are in lower or upper limits; they manufactured and assembled in correct manner.
• Tolerance is the amount of error permitted in making the products.
• Tolerance can be specified in Drawing.

Direction Tolerancing Method

• Limit Dimension
  
• Plus minus dimension
  
• Geometric tolerance direct applied to features
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Types of plus minus tolerancing method

• Bilateral tolerance
• Unilateral Tolerance

Bilateral Tolerance method

In this method tolerance dimension varies in both dimensions from basic size. If the variation equal in both sides then PLUS & MINUS symbol applied.

 Unilateral Tolerance method

When the tolerance value is specified in only in one direction from the basic size then it is known as unilateral tolerance method.

Other Important Terms

• Basic Size
• Nominal Size
• Actual Size
• Limits
• Allowance
• MMC(Most material condition)
• LMC(Least material condition)
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  Writer: Waleed Altaf

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