The Mori Seiki MT3500S/3500 is an 8-axis multi-tasking CNC lathe with a reputation for rigid, production-grade complete-machining that has made Mori Seiki's MT platform a staple in aerospace, oilfield, and heavy-shaft environments. This machine features 125 inches of distance between centers, a 22.4-inch max turning diameter, 31.5-inch max swing over the bed, and travels of X-25 inches / Y ±4.3 inches / Z-125 inches with a B-axis that swivels 120° for off-centerline drilling and contour milling. The main spindle provides 3,000 RPM and 40 HP through an A2-8 nose with a 4.1-inch bore and a 12-inch hydraulic three-jaw chuck, while the A2-8 sub-spindle runs 4,000 RPM with a 20 HP motor, 4.1-inch bore, and 12-inch three-jaw chuck for second-op work in the same setup. A Capto C6 universal head drives live milling up to 8,000 RPM at 15 HP, and the 120-position tool magazine covers turning, boring, milling, drilling, and tapping without changing platforms. Control is the Mori Seiki MSX-501 based on Fanuc 18iTB with MAPPS software, and the machine is equipped with a Cool Jet 1,000 PSI high-pressure coolant system, thru-spindle coolant, pneumatic steady rest, (2) 12-inch programmable turn-through steady rests, hydraulic unit, auto door, chip conveyor, and 480/3/60 power.
Compared to Mori Seiki's earlier two-axis turning platforms like the SL-series and the NL2500/NL3000 — machines built for turning and boring only — the MT3500S delivers true complete-part machining with C-axis on both spindles, Y-axis, B-axis universal head, live milling, and sub-spindle part transfer all in one chucking. Relative to the original MT3500 multi-tasking lathe, the "S" revision brought upgraded control architecture (MSX-501 running on Fanuc 18iTB with MAPPS), expanded tooling capacity with the 120-position magazine and Capto C6 turret, and a stiffer long-bed configuration that supports up to 125-inch shafts. For buyers currently stringing work across a lathe, a machining center, and a Swiss platform, the MT3500S replaces three setups with one — and does it at a used-machine price that pays back the first complex aerospace or oilfield shaft job it sees.