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Overview

Engineering reference data for Blueprint Pages Letters in drawing tools.

Key Formulas

Scale Factor

$SF = \frac{\text{drawing size}}{\text{actual size}}$

Ratio of drawing to real dimensions.

Tolerance

$T = \text{max} - \text{min}$

Allowable variation in dimensions.

Aspect Ratio

$AR = \frac{w}{h}$

Width to height ratio.

Variables

Symbol	Description	Unit
$SF$	Scale factor	—
$T$	Tolerance	mm
$AR$	Aspect ratio	—

References

• Original Source