Citizen L20-Xll

It allows quick and easy switching from guide bush operation for long components to non-guide bush configuration for short components, as well as a swivelling B-axis. The L20-XII also boasts an option to allow users to increase the material size that can be turned in the machine from 20 to 25 mm in diameter. The 135º B-axis is capable of carrying driven tools with an angular approach. A Y2-axis for the opposite toolpost widens the potential to make complex components. It also enables simultaneous machining to reduce cycle times. The L20-Xll has a 3.7 kW, 10,000 rpm main spindle with, using the guide bush, a 200 mm maximum machining length (Z1-axis). In non-guide bush mode, up to 2.5 times the work diameter can be turned. The option to operate using non-guide bush techniques means that short length parts can be economically, while a further benefit is the avoidance of long bar remnants. When used in non-guide bush mode, short components with high tolerances and close bore to OD geometry can be readily machined. The back spindle (Z2, X2) has a 1.5 kW drive delivering 8,000 rpm. Tooling capacity is 40 positions, with 26 held on the gang toolpost, six on the opposite toolpost and eight on the back toolpost. The X1-Y1 axis gang toolpost accommodates five turning tools plus 21 tools, of which eight are held four each side of the B-axis swivelling unit. This configuration allows the drilling and milling of angled features at up to 8,000 rpm and positioned between -90º and +45º during front and back machining operations. The 4-axis control capability enables complex contouring to be performed. The back toolpost, which allows cross drilling and slitting to be performed, will hold up to eight tools positioned in two rows of four. Upper level tools are driven at up to 7,500 rpm and the lower four are fixed and able to accept turning, boring or drilling tooling. The opposite toolpost, which has a Y2-axis with six 7,500 rpm driven tools is suitable for deep hole drilling cycles and accommodates simultaneous operations including overlapping and pinch milling. With so many axes of movement available, fast positioning is critical to maintain competitive cycle times, so rapid feedrates on main axes are 32 m/min.