Overview
ISO 3590:1976 - "Modular units for machine tool construction - Spindle units" specifies the dimensional requirements that ensure interchangeability of spindle units used in modular special‑purpose machine construction. The standard covers quill‑feed (self‑feeding) single spindle drilling units (with and without an adjusting slide for tool changing), single spindle drilling units, single spindle milling units and single spindle facing and boring units. Dimensions are given in tables (Tables 1–5) and cover features such as spindle noses, stand‑out, stroke, fixing bolt centres and drive shaft details.
Key topics and requirements
- Scope: Dimensions that enable interchangeability of spindle units in modular machine tool assemblies.
- Unit types covered:
- Quill feed (self‑feeding) single spindle drilling units (Form A/B)
- Quill feed units with adjusting slide for tool changing
- Single spindle drilling units
- Single spindle milling units
- Single spindle facing and boring units (not intended for fine boring)
- Spindle nose interfaces follow related ISO nose/taper standards:
- Parallel bore spindle nose to ISO 2905
- 7/24 taper bore to ISO 297
- Spindle nose types for facing/boring per ISO 702 (Forms A, B, C)
- Multi‑spindle mounting features per ISO 3476
- Dimensional data: Tables specify overall length, stroke, stand‑out, distances between fixing bolt centres, nominal base widths and recommended fixing bolt sizes.
- Mounting and tolerance notes:
- Lateral fixing bolt holes spaced in increments of 25 mm (manufacturer’s selection); tolerance between extreme holes ±0.2 mm
- Spindle heights are not standardized
- Motor position, detailed unit body design and motor size are left to manufacturer discretion
- Use of two dowels for location is permitted
Applications
- Machine tool designers and OEMs building modular special‑purpose machines can use ISO 3590:1976 to select compatible spindle units and ensure mechanical interchangeability.
- Systems integrators and manufacturing engineers benefit when retrofitting or replacing spindle modules without redesigning the machine base.
- Component suppliers and spindle manufacturers use the standard to produce units that mate reliably with modular frames, multi‑spindle heads and adaptors.
- Maintenance and procurement teams use the dimensional rules to source drop‑in replacements and standardize spares.
Related standards
- ISO 2905 - Spindle noses and adjustable adaptors (16–48 mm)
- ISO 297 - 7/24 taper for tool shanks
- ISO 702 - Spindle noses and face plates (Parts 1–3)
- ISO 3476 - Flanges for mounting multi‑spindle heads
ISO 3590:1976 is a practical reference for anyone involved in modular machine tool construction, spindle unit design, or interchangeability planning. Keywords: ISO 3590:1976, spindle units, modular units, machine tool construction, quill feed, single spindle drilling, milling units, interchangeability, spindle dimensions.
