What is "virtual sharp" on a blue print?

In a blueprint, "virtual sharp" refers to a construction symbol used to indicate the intersection point of two lines. It represents a point where two lines would ideally intersect, but in reality, they may not actually meet due to manufacturing variations or other factors. The purpose of the virtual sharp symbol is to geometrically define a theoretical point on the blueprint where the lines would meet if they were extended. It helps specify the intended geometric relationship between these intersecting lines.

To locate a virtual sharp on a blueprint, you need to follow the following steps:

1. Identify the lines: Look for two lines that are meant to intersect on the blueprint. These lines could represent edges, axes, or any other geometric features.

2. Look for the virtual sharp symbol: The virtual sharp symbol typically appears as a small "x" or a dot placed at the intersection point of the two lines.

3. Analyze the dimensions or annotations: Examine any dimensions or annotations associated with the virtual sharp to understand its purpose or the intended relationship between the lines.

Note that the virtual sharp may not always be present on blueprints. It is used in situations where precise intersection points need to be communicated, especially when manufacturing tolerances or other factors can cause slight deviations from ideal geometry.