Building on the strengths of previous generations of Miyano fixed-head turn-mill centres, the BNA-42SY is Citizen Machinery’s latest addition to the range. The CNC lathe is the first BNA model to have a 12-station turret giving ±35 mm of Y-axis movement, all tool positions now being live, and a new design that lends itself to easy automation.

Compared with current BNA models, machining efficiency has been upgraded by more powerful spindle motors, which are rated at 7.5/5.5 kW (15min/cont) for the 6000 rpm main spindle and 5.5/3.7 kW for the 5000 rpm sub-spindle. Acceleration and deceleration are quicker on both spindles, improving productivity further by minimising idle times.

The machine’s rigid bed, the weight of which is now 1823 kg, brings thermal control advantages and more capacity to house a larger coolant tank. Notably, the base casting has been prepared with space at the right-hand side for robotic load/unload equipment. If a user intends to take advantage of automation, the machine is available with a swarf conveyor that exits to the rear as an option. Users may deploy the automation solely for unloading components that have been turn-milled from bar stock up to 42 mm diameter, either directly from a spindle or via a parts catcher and conveyor. Alternatively, or in addition, it may load and unload billets or near net shape workpieces like castings or forgings up to 135 mm in diameter.

Mounting points have been included to provide an option to add an overhead gantry if only chucking is to be carried out, in which case a raw material stocker can be positioned to the left of the machine in place of the bar magazine.

For further information
www.citizenmachinery.co.uk