Overview
ISO 2773:2024 - Test conditions for pillar type vertical drilling machines - Testing of accuracy is the international standard that specifies geometrical tests and permissible tolerances for general-purpose and normal-accuracy pillar-type vertical drilling machines. Published in 2024 and to be applied with reference to ISO 230‑1, the document focuses exclusively on the verification of machine accuracy (geometrical errors) and does not cover dynamic or operational characteristics such as vibrations, abnormal noises, stick‑slip, speeds or feeds.
Key topics and technical requirements
- Scope and references
- Applies to manual pillar-type vertical drilling machines and their geometrical accuracy.
- Cross-references: ISO 230-1 (geometric accuracy), ISO 230-7, and ISO/TR 230-11 for instrumentation and methods.
- Units and tolerances
- Linear dimensions in millimetres (mm); angular deviations expressed as ratios (µrad/arcsec conversions noted).
- Minimum practical tolerance: 0.010 mm for derived measuring lengths.
- Geometrical tests included
- Table flatness (e.g., 0.030 mm over up to 300 × 300 mm; total tolerance 0.050 mm).
- Face run-out of rotating tables (e.g., 0.075 mm at R = 150 mm).
- Spindle/internal taper run-out (e.g., 0.020 mm near spindle nose; 0.035 mm at 250 mm).
- Squareness checks:
- Spindle axis to table/base in YZ and ZX planes (tolerances expressed as 0.060/300).
- Quill motion (Z-axis) and elevating spindle head (Z2-axis) squareness to table surface (0.100/300).
- Measuring instruments
- Typical tools: precision level, straightedge, dial gauge, test mandrel, gauge blocks and cylindrical square.
- Measurement uncertainty guidance: see ISO 230‑1 for acceptable instrument accuracy vs. tolerances.
- Test conditions
- Machine levelling and warm-up should follow manufacturer guidance and ISO 230‑1.
- Tests can be performed in any practical order; selection of tests for acceptance is negotiated between supplier and user.
Applications and users
ISO 2773:2024 is intended for:
- Machine tool manufacturers and suppliers (acceptance testing and factory certification)
- Quality assurance teams and inspection labs (calibration, periodic verification)
- Maintenance and service engineers (diagnosis of geometrical errors)
- Purchasers and end-users (factory acceptance tests and contractual specifications)
Practical uses include factory acceptance, pre-delivery inspection, periodic requalification, and troubleshooting of drilling accuracy.
Related standards
- ISO 230-1:2012 - Geometric accuracy of machine tools (core reference)
- ISO 230-7:2015 - Geometric accuracy of axes of rotation
- ISO/TR 230-11:2018 - Measuring instruments for machine tool geometry tests
- EN 12717:2009 - Safety of drilling machines (informative reference)
Keywords: ISO 2773:2024, pillar type vertical drilling machines, testing of accuracy, geometrical tests, tolerances, spindle run‑out, table flatness, squareness, ISO 230-1.