Overview
ISO 2772:2019 - Test conditions for box type vertical drilling machines - Testing of the accuracy - standardizes geometrical accuracy tests and permissible deviations for box type vertical drilling machines (general purpose and normal accuracy). Intended strictly for verification of machine accuracy, the document references ISO 230-1 for installation, warm-up and general test methods and ISO/TR 230-11 for suitable measuring instruments. It does not cover machine operation tests (vibration, noise, feeds/speeds).
Key Topics
- Scope and applicability
- Applies to box-shape column guided vertical drilling heads and associated table (W-axis), spindle and quill.
- Focus on geometrical tests, tolerances and measurement procedures.
- Measurement units & minimum tolerances
- Linear values in millimetres (mm); angular values expressed as ratios (microradians or arcseconds may be used).
- Minimum tolerance to consider: 0.010 mm.
- Typical tests and tolerances
- Table flatness (G1): 0.030 mm for any 300 mm measuring length (use precision level or straightedge + gauge blocks).
- Spindle run-out (G2): example tolerances - 0.020 mm near spindle nose, 0.035 mm at 250 mm (use dial gauge and test mandrel).
- Spindle squareness to table (G3): 0.050/300 (check in symmetry plane and perpendicular plane).
- Drilling head (Z‑axis) squareness to table (G4) and quill squareness (G5): 0.100/300.
- Measuring instruments
- Examples: dial gauge, precision level, straightedge, test mandrel, gauge blocks, square. Other instruments may be used if measurement uncertainty is equal or better (see ISO 230-1).
- Test conduct & selection
- Tests may be performed in any practical order. For acceptance testing, the user and supplier should agree on which tests will be performed and documented.
- Machine levelling should follow manufacturer guidance and ISO 230-1 recommendations.
Applications and Users
ISO 2772:2019 is practical for:
- Machine tool manufacturers and designers validating geometric accuracy of box-type vertical drilling machines.
- Quality and metrology engineers performing acceptance tests and routine accuracy verification.
- Maintenance and service technicians diagnosing alignment or wear-related errors.
- Procurement and compliance teams specifying acceptance criteria for new machines.
Benefits include consistent acceptance testing, easier supplier-user agreements, and traceable measurement procedures.
Related Standards
- ISO 230-1:2012 - Test code for machine tools: geometric accuracy (installation, methods, uncertainties).
- ISO/TR 230-11:2018 - Measuring instruments for machine tool geometry tests.
- EN 12717:2009 - Safety of drilling machines (referenced for terminology).
Keywords: ISO 2772:2019, box type vertical drilling machines, testing of the accuracy, geometrical tests, spindle run‑out, table flatness, machine tool testing, ISO 230-1.