Citizen Cincom B16E-II

The Citizen Cincom B16E-II is a single-spindle sliding-headstock lathe for 16 mm bar, with gang rotary tools and 12 tool positions. It is the leanest 16 mm machine in Citizen's B12E/B16E table: the table gives it no back-spindle figures, a 10,000 rpm main spindle, and the lowest power requirement of the series at 3.3 kVA.

Without a back spindle, every part is finished from the bar side and then parted off. That suits pins, shafts and bushings whose cut-off end can stay as parted, or that will be deburred in a later step. Parts that need a drilled, tapped or chamfered back face belong on the Cincom B16E-V or B16E-VI, which add a 16 mm back spindle.

What the B16E-II does keep is rotary tooling. The gang rotary tools are rated for 5 mm drilling and M4 tapping at up to 4,500 rpm on a 0.5 kW motor, so cross holes, flats and small slots can be cut before parting. The main spindle side allows drilling to 6 mm and tapping to M6, through a 20 mm main spindle through-hole.

The stroke is 135 mm per chucking with the guide bush and 60 mm with the R.G.B. in use, when the main spindle also runs to a lower, separately listed limit. Turning tools are 10 mm square at 120 mm or 60 mm length. Rapids are 21 m/min on X and Y and 15 m/min on Z, and the main spindle motor is listed at 2.2/3.7 kW. With a 2.5 kVA average load and a weight of 1,100 kg, it is the easiest machine of the series to install. The Cincom B12E-II is its 12 mm counterpart at the same 1,100 kg, with a 12,000 rpm spindle.