ISO 11090-2:2014

Overview

ISO 11090-2:2014 - Test conditions for die sinking electro-discharge machines (die sinking EDM) - Part 2: Double-column machines (slide‑head type) defines standardized methods to verify geometric accuracy, repeatability and machining accuracy of double‑column, slide‑head die sinking EDMs. It applies to normal‑accuracy and general‑purpose die sinking EDM machines and specifies applicable tolerances, measurement units (millimetres), and terminology (axis designations referenced to ISO 841:2001). This part addresses accuracy verification only - not dynamic operation checks such as vibration, noise, speeds or feeds.

Key technical topics and requirements

• Scope and machine type: Applicable specifically to double‑column (slide‑head) die sinking EDM machines.
• Test types:
  • Geometric tests (examples: straightness, squareness, parallelism of linear axes - G1, G2, etc.).
  • Positioning tests for numerically controlled axes (P1–P4), covering accuracy and repeatability.
  • Machining test under finishing conditions to verify process accuracy.
• Standards cross‑references: Test procedures and environment reference ISO 230‑1:2012 (geometric accuracy, installation, instrument accuracy) and ISO 230‑2:2014 (NC axis positioning methods).
• Measurement practice:
  • Linear dimensions in mm; angular deviations mostly as ratios (microradians/arcseconds when needed).
  • Minimum tolerance rule: smallest tolerance set is 0.005 mm (unless proportional scaling applies).
  • Example tolerance: straightness of X‑axis typically 0.010 mm for a 500 mm measuring length (G1).
  • Acceptable measuring instruments include straightness artefacts, linear displacement sensors, and optical systems.
• Software compensation: Use of built‑in compensation is allowed only by mutual agreement between supplier and user; use must be recorded and axes shall not be locked during tests.
• Terminology: Annex A gives multilingual term equivalents; official ISO terms are English and French.

Practical applications and who uses it

ISO 11090-2:2014 is intended for:

• Machine tool manufacturers and OEMs performing factory acceptance tests (FAT).
• Quality and metrology labs conducting accuracy verification of die sinking EDMs.
• End users and purchasing agents specifying acceptance criteria for new or refurbished machines.
• Service and calibration providers validating positional performance after installation, repair or relocation.

Benefits:

• Provides repeatable, internationally recognized acceptance testing procedures.
• Ensures consistent specification of tolerances and test reporting (including software compensation status).

Related standards

• ISO 230‑1:2012 - Test code for machine tools - Geometric accuracy (installation and measurement guidance).
• ISO 230‑2:2014 - Test code for machine tools - Accuracy and repeatability of NC axis positioning.
• ISO 841:2001 - Axis designation and terminology for machine tools.

Keywords: ISO 11090-2:2014, die sinking EDM, double-column machines, slide-head, accuracy testing, geometric tests, positioning tests, ISO 230-1, ISO 230-2, tolerances.