TS ISO 9962-3

TS ISO 9962-3 defines the main dimensions of scale rule chuck plates used on manually operated draughting machines and specifies the combined heights, that is, the thicknesses, of the chuck plate assembly. In technical drawing equipment, the chuck plate is the interface component that helps locate and secure the scale rule in the machine, so dimensional consistency is essential for proper fit and movement.

Why the dimensions are treated as an assembly issue

The focus of this standard is not only the individual part size, but also the overall height created when the chuck plate is combined with the related elements. This helps maintain a stable geometric relationship between the scale rule, the guiding mechanism, and the machine body. In practice, that kind of dimensional alignment supports interchangeability and consistent assembly across compatible draughting equipment.

Role in manually operated draughting machines

Manually operated draughting machines rely on controlled, repeatable movement of a rule along a guide system. A scale rule supports accurate linear guidance and scale selection, while the chuck plate provides the mechanical connection to the machine. By defining the key dimensions of this interface, the standard establishes a common dimensional basis for compatible components. It is read together with ISO 9962-1 and ISO 9962-2.

This record is based on ISO 9962-3:1994 and is now withdrawn. Its subject is the dimensional definition of a mechanical component used in technical drawing equipment; it is not a separate performance, ergonomics, or drawing-accuracy test standard.