ABO NOCE Practice Test

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What is the formula for Minimum Blank Size?

MBS = TD + ED + 5mm
MBS = TD + ED - 2mm
MBS = TD + ED + 2mm
MBS = TD + 2ED

The correct answer is: MBS = TD + ED + 2mm

The formula for Minimum Blank Size (MBS) is a crucial aspect in determining the optimal size of a blank required for manufacturing processes like lens production. The correct computation reflects the necessity of accommodating the thickness of the lens and the desired edge thickness while ensuring the final product has a proper fit. In this formula, TD represents the thickness dimension, and ED stands for the edge dimension. By adding 2mm to the combined total of TD and ED, the formula accounts for essential margins left to prevent any mishaps during production. This added allowance helps ensure that the final blank size is sufficient to produce a lens that meets the required specifications without any risk of the blank being too small. The options that involve subtraction or incorrect additions fail to recognize the critical need for this additional space. It is essential in manufacturing due to practical considerations related to the handling and processing of materials. Therefore, the addition of 2mm serves as a safeguard to accommodate any variations or inaccuracies that might occur during the production process, leading to the correct choice of formula for Minimum Blank Size.