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The installation of the latest Miyano BNJ-51SY3 fixed-head turning centre from Citizen Machinery has helped Riverside Precision Engineering (RPE) to increase productivity, especially when producing large batches.

RPE, a toolmaking business that counts the winning of a contract to produce 150,000 rivets for use in stand seating for the London Olympics among its recent successes, has installed two of Citizen’s Miyano CNC fixed-head turn-mill centres.

Current customers are from the valve, marine, furniture, medical, rail and oil and gas sectors, and batch sizes on the Miyano range from 15 for prototype and trial parts, right through to quantities in excess of 10,000.

The Miyano BNJ-51SY3 has a 51mm bar capacity with 11kW of power to the main spindle, which is served by a 12-station all-driven 2.5kW 6,000rev/min turret with a Y-axis feed. 

Included in RPE’s specification is the parts catcher and output conveyor, which transports the finished component out of the cutting zone into the part collection box. 

Key benefits of product application

  • The Miyano BNJ-51 SY3 has helped greatly in terms of productivity and lead-time reduction. According to the company, it has provided quality, machining consistency, fast operational cycles and ease of setting, meaning that most changeovers and resetting can now be completed between one and one-and-a-half hours.
  • One of the directors of RPE claims that they are able to put a whole host of different parts through the machine and be totally confident that the machine will perform.
  • The Miyano is a very cost-effective single-cycle milling machine as well as a turning centre.
  • A 5.54kW secondary spindle has its own six-station turret, giving added independence and flexibility for back-working cycles that can act simultaneously with the main turret/spindle to create very flexible and time-saving overlapped operations. 
  • The second turret is also able to machine off-centre through an X-axis shift with the added advantage whereby the secondary spindle is able to follow the movement of the main turret. When this capability is combined with the use of double-sided driven toolholders, it is possible to combine and overlap front and back operations on a part.

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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