GRID ADDRESS SYSTEM
The grid pattern of multipurpose holes on every tooling plate and tooling block face is labelled with letters in one direction and numbers in the perpendicular direction. Tooling-block faces are numbered (counterclockwise) with Roman numerals. This allows recording the mounting-hole location of each component (e.g., A2, B3, D7, etc.) as part of permanent documentation.
Multipurpose holes are spaced within ±.0008 inches of true position on all tooling plates and blocks. The mini system is even more accurate, with all holes spaced within ±.0004 inches.