The HC 400 horizontal machining center from Doosan is a compact, heavy-duty machine designed for OEMs and job shops. Featuring a Meehanite cast iron bed, linear roller guideway and inline spindle, the high-precision machine is capable of making heavy cuts on tough materials, the company says.
X-, Y- and Z-axis travels measure 23.62" × 22.05" × 22.24". Maximum cutting feed rate is 787 ipm with rapid traverse rates ranging to 1,574 ipm. Axes are driven by high-precision double-nut ballscrews supported on both ends by angular thrust bearings. The double-pretension design is said to improve positioning repeatability. The HMC’s 35-hp, 10,000-rpm inline spindle is designed for high stock removal and deep drilling operations. Through-spindle coolant and an oil-cooled spindle chiller help to maintain a constant temperature at high speeds, reducing thermal growth and increasing cutting accuracy. The cam-type, swing-arm automatic toolchanger accommodates 60 tools and is said to provide 4-sec. chip-to-chip times.
The machining center’s telescopic cover inclined at a 30-degree angle directs chips into a trough to keep the area around the table clean, while high-velocity air jets clear chips while pallets are being changed. An automatic pallet changer with twin tapped pallets helps to minimize set-up time and increase productivity. Each pallet measures 15.7" × 15.7" and can handle a maximum load of 882 lbs. The FANUC 32i-A control features a 90-degree swiveling operator console for improved ergonomics. The handheld manual pulse generator with 10-ft. cord enables full access to the machine and controls access movement in increments of 1, 10 or 100 for easy fixture or workpiece alignment.
Editor PickWhy the Surge in HMCs?
Spending on horizontal machining centers is forecast to reach its highest level in more than a decade. Small shops in particular are buying these machines. A shop I recently visited illustrates the reason.