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CNC sliding-head turn-mill centres supplied by Citizen Machinery are enabling Trust Precision, a newly formed precision engineering company, to ensure it provides a good service and to stay ahead of the competition.

When Nick Street, an experienced setter and operator, started up the company in February 2012, he decided to invest in Citizen’s latest M32-VIII CNC sliding-head turn-mill centre as his sole machine.

Comprising a main spindle powered by 7.5kW and a two-axis back spindle with a 3.7kW drive, the M32 features a 10-station all-driven turret, with each position able to half-index and carry multiple tooling arrangements. This has a 1.5kW, 6,000rev/min motor and an extended Z-axis stroke to 212mm. 

Street has also recently ordered and installed a Citizen A20-VII CNC sliding-head turn-mill centre to accommodate more ‘basic’ machining cycles, leaving the high-specification M32 to add considerable value to more complex production parts.

Key benefits of product application

  • According to Street, the workpiece capabilities made possible by the M32’s 35mm bar capacity — compared with the usual 32mm sliding-head machines available — have enabled the company to go from strength to strength.
  • Street said that the M32 can accommodate all of the tools he will ever require for single-setup, one-hit turn-milling.
  • The high level of flexibility provided by the two Citizen machines, along with the M32’s latest control software developments, has reportedly given Trust an edge over its competitors at a critical time.
  • The M32’s 10-station all-driven turret is able to carry multiple toolholders and the two-axis gang tool post has additional B-rotational slant axis, which is able to provide simultaneous four-axis continuous contouring in conjunction with the main-spindle Z1-axis feed; this means, for example, that the machine can be programmed to produce angled features or four-axis milling cycles and use up to three driven tools simultaneously.
  • The gang tool slide is able to carry five turning and four driven tools, while a further nine tools, of which six are driven and three fixed, can be set on the back tool post.
  • Street said that the Citizen M32 offers much more in terms of versatility for a wide range of one-hit applications than any other machine he considered.

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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