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Air Chucks and Indexing Chucks

Marathon Machine Tools has vast experience in installation of SMW-Autoblok air chucks, indexing chucks and hydraulic chucking systems. Our chucks are widely used in pipe threading operations and in machining different sizes of tees and crosses for the oilfield industry.

Please review our product selection and call us with your application need!

BIG BORE®
INCH serration
Front-end pneumatic power chucks with extra large through-hole Ø 5.51” – 22” • standard jaw stroke • 3 jaws

Application/Customer’s benefit

End machining of long tubes with high clamping force at very short clamping cycles

Complete machine spindle bore can be used

Technical features

  • Power chuck with built-in pneumatic cylinder. Force transmission via wedge hook.
  • Air feed via distributor ring and SMW-profile seals, at stopped spindle.
  • A twin non-return valve in the chuck maintains the air pressure during machining.
  • Clamping pressure level constantly checked by a safety control system (only for external clamping

Standard equipment

  • 3 jaw chuck
  • 2 elbow unions G 3/8”
  • 12 mounting screws (9 for the BB-N 400)
  • 1 lifting eye bolt
  • 1 set T-nuts with bolts
  • 1 set soft top jaws
  • without distributor ring bracket

 

BIG BORE® ES
INCH serration
Front-end pneumatic power chucks with extra large through-hole Ø 5.51” – 21” • extended jaw stroke • 3 jaws

Application/customer’s benefit

End machining of long tubes with collars at high clamping force and very short clamping cycles, thanks to the rapid and the clamping stroke

Complete machine spindle bore can be used.

For outside clamping only.

Technical features

  • Power chuck with built-in pneumatic cylinder.
  • Force transmission via wedge hook with 2 inclinations (for rapid and clamping stroke).
  • Air feed via distributor ring and SMW-profile seals, at stopped spindle.
  • A twin non-return valve in the chuck maintains the air pressure during machining.
  • Clamping pressure level constantly checked by a safety control system (only for external clamping
  • Clamping stroke control (no clamping in rapid stroke) is monitored.

Standard equipment

  • 3 jaw chuck
  • 2 elbow unions G 3/8”
  • 12 mounting screws (9 for the BB-N ES 400)
  • 1 lifting eye bolt
  • 1 set T-nuts with bolts
  • 1 set soft top jaws without distributor ring bracket

 

BIG BORE® BBU-AZ-ES
INCH serration
Front-end pneumatic power chucks with extra large through-hole Ø 8-5/8” – 14.37” • self centering or compensating clamping • extended jaw stroke • 3 jaws

Application / Customer’s benefit

End machining of straight or bent tubes.

Tubes can be clamped selfcentering or with radial jaw compensation at bent tubes, using a centering chuck.

No reduction of spindle bore due to selfcontained chuck design.

Technical features

  • Built-in pneumatic cylinder for selfcentering or compensating clamping mode
  • Air feed for both functions via air distributor ring at stopped spindle
  • Built-in safety valve

Standard equipment

  • Chuck with mounting bolts
  • 1 set of T-nuts with bolts

 

AXN Automatic indexing chuck Automatic indexing chucks Ø 8” – 26” • hydraulic clamping and indexing • divisions: 4 x 90° / 8 x 45° / 3 x 120° / 6 x 60° or specials • proofline™ = sealed chucks – low maintenance • 2 jaws

Application / Customer’s benefit

Fully automated and high productivity machining of components with orthogonal axis with 45°, 60° or 120° axis

High productivity for machining of work pieces like valve bodies, spiders or fittings (see below) at high position.

AXN: Automatic indexing chuck with hydraulic clamping and indexing

Technical features

  • Rigid holding of the work piece at high revolutions allowing high chip removal rates
  • High positioning and repeatability precision
  • Reliable indexing system with constant oil lubricated internal mechanism
  • Constant and automatic in-process controls for extremely safe machining
  • Proofline = fully sealed/low maintenance
  • Components supplied on request
  • Adapter parts and clamping jaws