OKK HM1000S

The OKK HM1000S is a large-capacity horizontal machining center designed for shops that need serious metal removal capability on big parts. With a 1,000 mm (39.4 in) pallet and 1,600 x 1,300 x 1,300 mm (63.0 x 51.2 x 51.2 in) X/Y/Z travel, this machine handles the large castings, housings, and structural components that mid-size HMCs simply cannot fit. OKK built the HM1000S for heavy industry applications — power generation, construction equipment, oil and gas, and large die/mold — where the workpieces are big, the materials are tough, and the machine needs to cut aggressively shift after shift.

The machine's structural design centers on OKK's proven wide box guideway construction on all axes. The column, bed, and saddle are massively ribbed Meehanite castings that provide the rigidity and damping needed for heavy interrupted cuts in cast iron and steel. At 28,000 kg (61,729 lb), the HM1000S has the mass to absorb the cutting forces generated during aggressive roughing with large-diameter face mills and boring bars. The box guideways contribute to long-term geometric stability, maintaining accuracy even after years of heavy production use.

The BT50 spindle delivers 30 kW (40 HP) of continuous power at speeds up to 8,000 rpm through a 2-speed gear head. The gear drive provides high torque at low RPM — critical for large-diameter face milling and heavy boring operations where constant surface speed demands high torque output. The 2-pallet changer comes standard, and the 60-tool ATC (90 or 120 optional) supports complex multi-operation parts. Through-spindle coolant at 70 bar handles deep-hole drilling and pocket flushing.

Positioning accuracy is +/-5.0 microns with repeatability of +/-3.0 microns — standard production-class specs for a machine of this size. The Fanuc 31i-B control provides full 4-axis capability through the B-axis rotary pallet. The HM1000S competes with the Toyoda FH1250SX, Mazak HCN-12800, and Doosan NHP 10000 in the large-capacity HMC segment. OKK's advantage is its construction quality and reputation for machines that maintain cutting performance over decades of hard use.