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The latest version of the B series CNC sliding-head turn-mill centre from Citizen Machinery — designated the B12E for 12mm capacity and B16E for bar sizes of 16mm — is designed for entry-level applications. It is supplied with bar feed, installation and a two-year warranty for less than £66,000.

The B series machine holds 16 tools and is similar to the original B series in that it retains the configuration of turning tools that are mounted radially around the main spindle housing in the form of a yoke.

The fourth-generation machine delivers increased rigidity for the main spindle and the sub-spindle and improved thermal placement to enhance accuracy over extended and continuous machining cycles as well as increased motor power.

The machine accommodates five turning tools, three driven tools for cross drilling on the gang toolpost and four tool positions for front drilling plus a further four for back drilling.

Key features and specifications

  • Turning tool configuration minimises lost time in positioning and ensures high levels of repeatability and accuracy using virtual axes at 45°
  • Main spindle is 3.7kW for both capacity versions
  • Maximum speed on 12mm spindle is 12,000rev/min; maximum speed on 16mm spindle is 10,000rev/min
  • Sub-spindle is 1kW, 6,000rev/min on both machines with the driven tools powered by 0.5kW, 4,500rev/min motor
  • Each machine has an enlarged coolant tank that holds 117 litres
  • Chip receiver box can be easily withdrawn for efficient cleaning
  • Control software includes a series of canned cycles, constant surface speed, customer macro, hobbing and polygon turning and drawing dimension direct input
  • Options include a long workpiece unit as well as tool-life management and a submicron command

Citizen Machinery

Citizen is the world leader in CNC sliding head ‘one-hit’ turn-milling technology. It has a range of machines having a maximum bar capacity between 4 mm on the compact micro-machining capable Citizen R04 to 32 mm on the top of the range Citizen M32-VII which has the added capability of two Y-axis cross-feeds.   

The M32 can carry up to 80 tools, of which 20 can be driven, and can cut with three tools simultaneously giving low cycle times and high levels of productivity.  Also, fully automated unmanned cycles can be utilised through an integrated gantry option and conveyor system that helps ensure damage free parts during uninterrupted batch production.  A high pressure 2,000 psi CoolBlaster coolant system is a further option to optimise swarf control, tool life and machining difficult materials.

Following the acquisition in Japan in 2008 of 65 per cent shares in Miyano, the fixed head turning centre specialist, the two companies are maintaining their separate high profile brand names utilising a single sales operation.  However, turn-milling solutions from bar up to 64 mm diameter can now be provided.  In addition, with the Miyano range of turning and turn-milling machines for chucking operations, cell-type applications can now be accommodated with a wide range of automation options.   

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