GD&T Quiz

Conventional dimensioning and tolerancing does guarantee the part will be fit and functions at assembly level

• Yes

• Wrong

What is dimension?

• Allowance of dimensional variation

• Length or angle of manufactured part

Comparison between conventional dimension and tolerance and GD&T?

• GD&T more precise and simple

• Conventional dimension and tolerance is more easy to understand

What is actual size?

• The size we use in speaking of an element

• The measured size or dimension of a finished part

What is tolerance?

• Length or angle of manufactured part

• Allowance of dimensional variation of a manufactured part

What is clearance?

• when the internal member is bigger than the external member

• when the internal member is smaller than the external member

What is interference?

• internal member is larger than the external member

• internal member is bigger than the external member

Why we use GD&T?

• To improve communications

• To increase the cost of product

Benefit of using GD&T?

• Save cost

• You can 90% certain that your part will fit and function properly at the assembly level

What is datum?

• degree of freedom

• Datums are points, lines, planes, cylinders, axes from which the location or geometric relationship of other part