What are proper safety distances as it relates to minimum openings as related to guarding openings to an accessible hazard?

It is critical to ensure that machine guarding is in place preventing the ability to touch / reach any active machine hazards, such as pinch points, crush or shear points, entanglements, to name a few.  This is accomplished through the design of machine guarding using the following chart showing openings in panels, as well as crawl under and reach over specifications.