Overview
ISO 3190:1975 specifies test conditions for verifying the accuracy of turret and single-spindle coordinate drilling machines with a vertical spindle. The standard defines both geometrical and practical tests, the corresponding permissible deviations (in millimetres and inches), and the recommended measuring equipment and procedures. It is limited to accuracy verification and explicitly excludes tests of machine running behavior (vibration, abnormal noise, stick‑slip) and operational characteristics (speeds, feeds), which should be checked prior to accuracy testing.
Key topics
- Scope and application: Applies to general-purpose and normal-accuracy turret and single-spindle coordinate drilling machines (box type, fixed/variable height table, bridge machines); users select relevant tests for the machine configuration.
- Reference procedures: Test methods and installation/warm-up recommendations reference ISO/R 230 (Machine tool test code) and related test codes.
- Geometrical tests: Leveling, table flatness and parallelism, straightness and squareness of table slots and movements, vertical slideway straightness, spindle-to-table squareness. Many tests include repeat measurements on every turret spindle.
- Spindle tests: Run-out of internal spindle taper near the nose and at distances (e.g., 300 mm), periodic axial slip, camming of the spindle face, and repeatability for turret indexing.
- Multi-spindle turret tests: Positioning accuracy and repeatability of internal spindle mounting surfaces and turret indexing (test G12).
- Practical test: Measurement of spindle-axis deflection under a specified axial force F; Annex provides a graph correlating axial force to the machine’s drilling capacity for typical medium‑steel drilling.
- Measuring equipment: Precision levels, straightedges, dial gauges, test mandrels, squares, gauge blocks and calibrated test instruments; tolerances depend on measuring length with minimum tolerance guidance (e.g., 0.01 mm referenced).
Applications and users
ISO 3190 is used by:
- Machine tool manufacturers to specify acceptance and production test criteria.
- Quality control and inspection teams in workshops and test labs for factory acceptance and periodic verification.
- Maintenance engineers assessing corrective adjustments to restore machine accuracy.
- Purchasing agents and end users who require objective acceptance tests when ordering drilling machines.
Practical value: ensures consistent, repeatable accuracy assessments, supports contract acceptance, and helps maintain part quality and interchangeability in production.
Related standards
- ISO/R 230 - Machine tool test code (installation, measuring methods, warm-up)
- ISO 3686 - Test conditions for similar turret/single‑spindle drilling & boring machines (fixed‑height table)
Keywords: ISO 3190, drilling machine accuracy, turret drilling machine, single spindle coordinate drilling, machine tool testing, geometrical tests, spindle run-out, permissible deviations.