ISO 8636-1:2000

Overview

ISO 8636-1:2000 - Machine tools - Test conditions for bridge‑type (portal‑type) milling machines - Part 1: Fixed bridge (portal‑type) machines - defines standardized test conditions and procedures for verifying the geometric accuracy, machining performance, and positioning accuracy of fixed‑bridge (portal‑type) milling machines. It applies to machines with moving tables and fixed double columns (portal machines) and is focused on verification of accuracy (not on operational characteristics such as vibration or speeds). The standard references and complements ISO 230‑1 and ISO 230‑2 for test methods and NC axis positioning checks.

Key topics and technical requirements

• Scope and applicability
  • Targets fixed bridge (portal‑type) milling machines with moving tables and fixed double columns.
  • Excludes single‑column machines and machines with fixed tables and moving columns.
• Test categories
  • Geometric tests (coordinate axes, table, spindle, milling heads, etc.).
  • Machining tests (flatness by slab milling, milling of lateral faces).
  • Accuracy and repeatability of NC axes (linear and rotary axes).
• Terminology & axis designation
  • Provides standardized names for principal components (bed, columns, cross‑rail, milling heads) and axis designations for portal machines.
• Measurement conventions
  • Linear units in millimetres, angular units in degrees; angular deviations often expressed as ratios (e.g. 0.00x/1000) or microradians/arcseconds.
  • Example equivalence: 0.010/1000 = 10 μrad ≈ 2".
• Test conditions & procedural guidance
  • Refers to ISO 230‑1 for machine installation, warm‑up, measuring methods, and equipment accuracy.
  • Temperature conditions and exact tests to perform are to be agreed between supplier and user.
  • Test sequence is flexible to facilitate instrument mounting; results should record actual deviations and specified tolerances where applicable.

Applications and practical value

• Acceptance testing of new portal milling machines to confirm conformity to specified geometric and positioning tolerances.
• Factory or site verification when installing or commissioning fixed‑bridge machines.
• Quality assurance for manufacturers and users to document machine capability for precision milling, boring, drilling and tapping.
• Procurement & contract testing, where supplier and buyer agree on which tests are required for acceptance.

Who uses ISO 8636-1:2000

• Machine tool manufacturers and OEMs
• Quality assurance and metrology engineers
• Factory acceptance test (FAT) and site acceptance test (SAT) teams
• Maintenance and calibration specialists involved in precision machining equipment

Related standards

• ISO 230‑1:1996 - Test code for machine tools - Geometric accuracy (reference for methods and equipment)
• ISO 230‑2:1997 - Test code - Accuracy and repeatability of NC axes
• ISO 8636‑2 - Part 2: Travelling bridge (Gantry/Gantry‑type) machines

Keywords: ISO 8636-1:2000, bridge-type milling machines, portal-type machines, machine tool testing, geometric accuracy, machining tests, positioning accuracy, ISO 230-1, ISO 230-2.