ISO 3070-2:2016

Overview

ISO 3070-2:2016 - Machine tools - Test conditions for testing the accuracy of boring and milling machines with horizontal spindle - Part 2: Machines with movable column along the X‑axis (floor type) - defines standardized test conditions and applicable tolerances for verifying the geometric accuracy and positioning performance of horizontal-spindle boring and milling machines whose column moves along the X‑axis. The standard focuses on accuracy verification (not operational checks such as vibration, noise or speed/feed performance) and applies to general‑purpose, normal‑accuracy machines.

Key topics and technical requirements

• Scope & machine configuration: Floor‑type machines with column movement on the bed (X), spindle head vertical movement (Y), ram axial movement (Z), boring spindle axial movement (W), and optional table movements (R, B).
• Geometric tests: Straightness, angular deviations, squareness, parallelism between axes, and geometric checks of spindles and tables (see Clause 7).
• Spindle tests: Boring and milling spindle accuracy assessments and tests for accessory facing heads (Annex B).
• NC positioning: Determination of accuracy and repeatability of numerical‑control (NC) axes (Clause 8), including test sequences and measurement practice.
• Axis rotation and rotary tables: Geometric accuracy of axes of rotation (informative Annex A) and indexing/rotary table checks.
• Measurement practice: Reference to measurement units (mm, degrees), recommended measuring instruments, software compensation considerations and minimum tolerance rules.
• Tolerances: Specifies tolerances corresponding to general‑purpose, normal‑accuracy machines (no numeric values given here - see standard for tables).
• Normative references: Integrates ISO 230‑1, ISO 230‑2 and ISO 230‑7 and cross‑refers ISO 17543‑1 for universal spindle head test conditions.

Applications and users

Who uses ISO 3070-2:2016:

• Machine tool manufacturers - acceptance testing and design verification for floor‑type horizontal boring/milling machines.
• Quality & metrology labs - standardized procedures for geometric and NC accuracy measurement.
• Buyers, end users and maintenance teams - acceptance checks, periodic verification, and maintenance planning.
• Inspection bodies and test houses - objective, repeatable criteria for contract and compliance testing.

Practical benefits:

• Provides consistent, comparable accuracy data for procurement and acceptance
• Supports troubleshooting and preventive maintenance by isolating geometric vs. operational causes
• Enables qualification of retrofit, software compensation, and spindle/head accessories

Related standards

• ISO 230‑1: Geometric accuracy of machines (test code)
• ISO 230‑2: Determination of accuracy and repeatability of NC axes
• ISO 230‑7: Geometric accuracy of axes of rotation
• ISO 17543‑1: Test conditions for spindle heads (related accessory heads)

Keywords: ISO 3070-2:2016, machine tools, boring and milling machines, horizontal spindle, movable column X-axis, test conditions, geometric tests, spindle tests, NC positioning, tolerances, ISO 230.