Overview
ISO 7988:1988 - "Woodworking machines - Double-end tenoning machines - Nomenclature and acceptance conditions" defines standardized nomenclature and acceptance tests for double-end tenoning woodworking machines. The standard specifies the English, French and Russian ISO terms and provides equivalent German, Spanish, Italian and Swedish terms. It also sets out the geometrical and practical tests and permissible deviations for machines of general-purpose use and normal accuracy, focusing exclusively on the verification of machine accuracy.
Key topics and technical requirements
- Nomenclature and terminology: Standardized names for machine parts (frames, beds, feed drives, holddowns, cutter heads, controls, safety devices) in three official ISO languages plus equivalent terms in four other languages for cross‑border documentation.
- Geometrical tests: Procedures and checks for straightness, squareness, parallelism, alignment, run‑out and camming of spindles and feed components. Example permissible deviations given in the standard include:
- Straightness/saw-cut straightness: e.g., 0.15 mm over 1 000 mm (practical test example).
- Squareness checks: e.g., 0.2 mm per 1 000 mm in selected tests.
- Run‑out and camming limits: examples given include 0.02 mm run‑out and 0.01 mm camming (measuring length examples appear in the text).
- Practical tests: Performance checks on test pieces (e.g., pre‑cut chipboard) to verify straightness and squareness of cuts under defined feed speeds and measuring lengths.
- Measurement integrity: Measuring instruments must introduce errors no greater than one‑third of the checked tolerances; all dimensions and deviations are expressed in millimetres.
- Scope limits: The standard is limited to accuracy verification. It explicitly excludes dynamic running tests (vibration, noise, speeds and feeds), which should be checked before accuracy testing.
Applications and who uses this standard
- Machine manufacturers: to specify part names, acceptance criteria and factory acceptance procedures.
- Quality and test laboratories: to perform standardized geometrical and practical acceptance tests and report results against defined permissible deviations.
- Purchasers and specifiers: to include clear acceptance conditions in procurement contracts and technical specifications.
- Inspectors, installation engineers and maintenance teams: to verify machine alignment and accuracy during commissioning and periodic re‑acceptance.
- Training and documentation: for consistent operator manuals, spare parts lists and multilingual documentation.
Related standards
- ISO 230-1 - Acceptance code for machine tools (geom. accuracy tests reference).
- ISO 2304 - Installation and measuring-method guidance (referenced for warming up, installation and measuring techniques).
- ISO 7984 - Technical classification of woodworking machines.
ISO 7988 is essential when you need consistent terminology and reliable, repeatable accuracy tests for double‑end tenoning machines used in professional woodworking and production environments.