Overview
ISO 2423:1982 - "Acceptance conditions for radial drilling machines with the arm adjustable in height - Testing of accuracy" is an ISO standard that defines how to verify the accuracy of general-purpose, normal-accuracy radial drilling machines whose arm can be adjusted in height. This second edition (1982) cancels ISO 2423:1974 and focuses exclusively on accuracy verification (geometrical and practical tests) and the corresponding permissible deviations. It does not cover running characteristics (vibration, noise, speeds/feeds) which should be checked before accuracy testing.
Key topics and technical requirements
- Scope and test reference: Uses ISO/R 230 (Machine tool test code) for test methods, installation, and measuring practices. All dimensions and tolerances are given in millimetres and inches.
- Geometrical tests: Verifies features such as base-plate flatness and levelling, arm parallelism and radial movement, saddle movement, spindle squareness and vertical travel squareness. Tests are normally performed with the arm and saddle at mid-travel unless otherwise specified.
- Spindle checks: Includes measurement of spindle internal-taper run-out - typical permissible values in the standard are 0.025 mm (0.001 in) at the taper mouth and 0.05 mm (0.002 in) at 300 mm from the spindle nose. Squareness of the spindle axis to the base plate is also specified.
- Practical (load) tests: Defines an axial-load deflection test that measures spindle axis deflection under a specified axial force applied at the spindle nose (instead of an actual drilling test). The required test load is either manufacturer-specified or selected using the annex graph that relates axial force to drilling capacity.
- Instruments and measurement: Typical measuring equipment referenced includes precision levels, straightedges, dial gauges, test mandrels, gauge blocks and load cells. A calibration sheet for test instruments is expected.
- Permissible deviations: The standard lists permissible deviations for each test item and gives observations on test set-up (e.g., arm and saddle locked, measuring positions).
Applications and users
- Who uses it: machine-tool manufacturers, quality/acceptance inspectors, test laboratories, machine tool purchasers, service engineers and dealers.
- Practical uses: acceptance testing of new radial drilling machines, factory inspection, quality assurance during installation, and contractual acceptance criteria when buying or specifying radial drilling equipment.
- Benefit: Provides objective, repeatable accuracy tests and clear permissible deviations to support acceptance, warranty checks and quality control.
Related standards
- ISO/R 230 - Machine tool test code (referenced for measuring methods and test conditions).