Overview
ISO 2912:1973 addresses dimensional standardization for multi-spindle heads used in modular machine tool construction. The standard specifies a range of basic casing dimensions and details the input drive shaft dimensions required for interchangeability with motor couplings. The nominal size of a multi-spindle head is defined by the nominal width of the saddle on the related slide unit (see ISO 2562).
The document includes illustrative figures and two key tables: Table 1 (multi-spindle head casing dimensions) and Table 2 (input drive shaft dimensions). It was prepared by ISO/TC 39 and published in December 1973.
Key Topics
- Scope and purpose: Establish a consistent set of basic dimensions to support modular design and interchangeability of multi-spindle heads and their input shafts.
- Reference standard: ISO 2562 (Modular units for machine tool construction - Slide units) is cited for the nominal saddle width basis.
- Nominal sizes: Nine nominal sizes are adopted: 125, 160, 200, 250, 320, 400, 500, 630 and 800 mm.
- Dimensional tables: The standard provides a range of basic dimensions for casings (Table 1) and input drive shaft dimensions for motor coupling interchangeability (Table 2).
- Illustrations: Figures show casing geometry and input drive-shaft arrangements to aid interpretation.
Applications
ISO 2912:1973 is practical for engineers, machine-tool designers, and manufacturing planners who need to:
- Design modular machine-tool systems with interchangeable multi-spindle heads.
- Specify compatible input drive shafts for standard motor couplings.
- Reduce engineering time and tooling costs by using standardized casing and shaft interfaces.
- Simplify spare parts management and maintenance through compatibility across nominal sizes.
Benefits include improved modularity, easier retrofitting of heads and motors, and reduced complexity in production lines where multi-spindle heads are used.
Related Standards
- ISO 2562 - referenced for slide unit saddle widths and the basis for nominal head sizes.
- Other ISO machine-tool modular units and component standards (consult current ISO catalogues for related parts and updates).
Notes and Context
The standard provides ranges rather than single fixed values; national standards bodies may select precise dimensions from the given ranges. ISO 2912:1973 was prepared by ISO/TC 39 and approved by multiple Member Bodies; the record notes technical disapproval by some Member Bodies. For implementation, consult the full ISO text and any subsequent revisions or national adoptions to ensure current compliance.
For practical design work, use ISO 2912:1973 alongside detailed component drawings and Table 1/Table 2 dimension data from the official publication to ensure accurate fit and interchangeability.
Open preview (PDF)Modular units for machine tool construction — Multi-spindle heads — Casing and input drive shaft dimensions
