ISO 3442-1:2005

Overview

ISO 3442-1:2005 - Machine tools - Dimensions and geometric tests for self-centring chucks with two-piece jaws - Part 1 covers dimensional interchangeability and geometric testing for manually operated, self-centring chucks with tongue-and-groove (two-piece) jaws. The standard defines sizes, mounting details and the geometric tests (by reference to ISO 230-1) and specifies the tolerances that apply to those tests. All dimensions and tolerances are expressed in millimetres.

Key topics and technical requirements

• Scope and limits
  • Applies to self-centring, manually operated chucks with two-piece (tongue and groove) jaws.
  • Excludes dynamic tests such as balance, gripping power or in-service balancing.
• Sizes for interchangeability
  • Nominal chuck diameters covered range from 100 mm to 800 mm (examples: 100, 125, 160, 200, 250, 315, 400, 500, 630, 800).
  • Includes dimensions for master (base) and top jaws and threaded/locating features.
• Geometric tests (G01–G05)
  • G01 / G02: Spindle/face-plate radial run-out and camming - spindle or face plate used for mounting must be checked first (tolerance example: 0.005 mm).
  • G1: Radial run-out of outer surface of the chuck (tolerances vary by nominal diameter, e.g., 0.02 mm for ≤125 mm).
  • G2: Camming of chuck face (same tolerance bands as G1).
  • G3: Equidistance between outer surfaces of top jaw locating key slots (tolerances increase with chuck size).
  • G4: Deviation between top of master jaws and mounting chuck face.
  • G5: Permissible deviation between top jaw locating centre-line and a parallel plane through the chuck centre-line.
• Measurement and conditions
  • Tests reference ISO 230-1 methods and use indicators/dial gauges or measuring machines.
  • Chucks may be mounted directly on a test spindle or via a face plate.
  • Several tests require the chuck tightened and master jaws locked on a dummy piece with the manufacturer’s specified clamping force.
• Accuracy class
  • This part specifies a single accuracy class for the listed tests.

Applications and users

• Useful for:
  • Machine tool manufacturers designing chucks and jaw interfaces for interchangeability.
  • Quality/inspection laboratories performing acceptance or routine geometric testing.
  • Maintenance and workshop engineers verifying chuck fit and mounting accuracy after repair or reconditioning.
  • Procurement and specification authors who need standard dimensional interfaces for workholding.
• Practical value:
  • Ensures top jaw interchangeability, repeatable centring and consistent machining accuracy across machines and jaw sets.

Related standards

• ISO 230-1:1996 - referenced test code for machine tool geometric accuracy.
• ISO 1101 - geometrical tolerancing (referenced in bibliography).

Keywords: ISO 3442-1:2005, self-centring chucks, two-piece jaws, tongue and groove jaws, geometric tests, ISO 230-1, interchangeability, chuck tolerances, radial run-out.