Citizen Cincom L20-VIII

The Citizen Cincom L20-VIII is the entry type of the third-generation L20 sliding-headstock lathe: a 20 mm bar machine (25 mm as an option) with a 10,000 rpm main spindle, a 10,000 rpm back spindle and room for up to 38 tools. Citizen's series page calls the type VIII the cost-effective end of a five-model lineup that runs up to the type XIIB5 with simultaneous 5-axis control.

Most of the tooling lives on the gang tool post, which carries 6 turning tools and 25 rotary tool positions. Those rotary tools drill to 8 mm and tap to M6 at up to 6,000 rpm (rated 4,500 rpm) on a 1.0 kW motor. Ordering the S3 high-power specification lifts them to 9,000 rpm and 2.2 kW, and raises the total load current from 37 A to 41 A. Beside the gang post sit 3 front drilling tools and 4 back drilling tools.

What the type VIII leaves out shows in its column. There are no back rotary tool rows and no Y2 rapid, both of which the Cincom L20-X column lists. Work on the cut-off end is therefore drilling and tapping from the back spindle: 8 mm drills, M8 cutting taps, with 40 mm of workpiece protruding from the back collet. If the part needs cross holes or flats on the back end, look at the higher types before ordering.

In guide-bush mode one chucking covers 200 mm at 20 mm, or 188 mm with the 25 mm specification. Without the guide bush the stroke drops to 50 mm per chucking, enough for short, stiff parts and less bar remnant. Finished parts up to 130 mm long can be ejected. The front spindle motor is rated 2.2/3.7/5.5 kW (continuous/15 minute/10%ED) and the back spindle 1.5/2.2/3.7 kW (continuous/40%ED/10%ED). All main axes rapid at 32 m/min.

Installation needs 8.3 kVA, a 60 A main breaker, AC 200V ±10% and 0.5 MPa air. The machine weighs 2,630 kg on a W2,222 × D1,265 × H1,835 mm footprint.