ISO 3686-2:2000

Overview

ISO 3686-2:2000 defines test conditions and acceptance checks for high‑accuracy portal‑type coordinate drilling and boring machines with a moving table and a vertical spindle. It is Part 2 of ISO 3686 and focuses on testing of the accuracy (geometric and machining tests) for portal machines. The standard complements ISO 230-1 by specifying machine‑type‑specific tests, tolerances and measuring practices for precision drilling/boring equipment.

Key topics and requirements

• Scope and purpose
  • Verification of machine accuracy only (geometric and finishing‑cut machining tests). The standard does not cover dynamic behaviour (vibration, noise) or general machine characteristics (speeds, feeds).
  • Applies to portal (bridge) machines with moving table; excludes jig borers and general machining centres.
• Reference standards and terminology
  • Uses ISO 230-1 for general test code and ISO 841 for axis designation.
  • Metric units (millimetres) and angular deviations primarily expressed as ratios (microradians/arcseconds).
• Geometric tests (examples from clauses)
  • Straightness of X‑axis in the XY plane (G1): 0.015 mm for measuring lengths up to 1 000 mm.
  • Squareness X–Y (G2): 0.02 mm for 500 mm.
  • Squareness of table vs Z (G3/G4): 0.015 mm for 300 mm.
  • Table flatness (G5): 0.03 mm up to 1 000 mm (add 0.01 mm per 1 000 mm; max 0.05 mm).
  • Parallelism and T‑slot alignment (G6–G8): typical tolerances 0.015–0.03 mm.
  • Spindle run‑out and axial slip (G9–G10): examples 0.01–0.02 mm depending on test location.
• Measuring methods and instruments
  • Examples: straightedge, taut wire, precision level, dial gauges (resolution 0.001 mm), microscopes, interferometers, test mandrels.
  • Minimum tolerance floor: 0.005 mm if different measuring lengths are used.
  • Machining tests must use finishing cuts only.

Practical applications and users

• Who uses ISO 3686-2:
  • Machine tool manufacturers (design validation, factory acceptance testing)
  • Quality / metrology engineers (site acceptance, periodic verification)
  • Calibration and testing laboratories
  • End users / production engineers specifying acceptance criteria for high‑accuracy drilling/boring equipment
• Benefits:
  • Provides repeatable, standardized methods and tolerances to verify accuracy of portal drilling/boring machines with moving tables.
  • Facilitates supplier‑customer agreements on acceptance testing and traceable measurement results.

Related standards

• ISO 3686-1 - Part 1: single column type machines
• ISO 230-1:1996 - Test code for machine tools (geometric accuracy)
• ISO 841 - Axis designation for machine tools

Keywords: ISO 3686-2:2000, portal type machines, moving table, coordinate drilling and boring machines, testing of the accuracy, geometric tests, machining tests, spindle run‑out, table flatness, ISO 230-1.