Mitsui Seiki HS5A

The Mitsui Seiki HS5A is listed as a horizontal machining center with a 2-station APC as standard, a No. 50 spindle taper as standard and 40 m/min (1,575 ipm) rapid traverse on all axes. It is not in Mitsui Seiki's current lineup, so it may be an older model. The listed figures also hold two sets of rows that contradict each other on X and Z travel, pallet size, spindle speed, power and tool capacity, so this page leaves those out; take them from the machine's own plate and manual.

What the table states without contradiction is the work envelope and the precision equipment. The largest workpiece is 800 mm (31.5 in) in diameter and 1,000 mm (39.4 in) high, at up to 1,000 kg (2,205 lb). Y travel is 700 mm (27.6 in). Positioning accuracy is listed at ±0.001 mm (±0.00004 in) over full stroke and repeatability at ±0.0005 mm (±0.00002 in), with full-closed loop feedback from linear scales on all axes and a rotary table resolution of 0.001°.

Thermal control is listed in three parts: spindle oil cooling, ballscrew cooling and ambient temperature compensation. The base is stress-relieved Meehanite cast iron, and the machine weighs 18,000 kg (39,683 lb). That much mass for a 1,000 kg (2,205 lb) part is the clearest sign of what the machine is for: holding position over long cycles more than chasing the shortest cycle.

For productivity, the rows that agree are the changers. Tool change is 3.8 sec chip-to-chip and pallet change is 16 sec, and the cutting feed range is 1–20,000 mm/min. A No. 40 taper is listed as an option to the standard No. 50.