OKK's HMC400 horizontal machining center (HMC) is engineered for faster cycle times using a lightweight column with a rigid, stepped X-axis rail design enabling feed rates of 63 m/min. (2,480 ipm) and 1-G XYZ acceleration. The built-in rotary table is said to operate with improved speed, using a large bearing in the B axis and a multi-clamp pallet system. An automatic pallet changer and tool changer further contribute to machine speed, accepting a variety of tool sizes as long as 450 mm. A longer tool allowance means deep boring operations can be completed without rotating the pallet, resulting in additional time savings. A high-torque Big Plus spindle reaches a maximum speed of 15,000 rpm in 1.7 sec. (with 50 hp) for faster machining of a variety of tough materials, including 1018 steel. The spindle design is said to improve tool accessibility and the distance from the spindle nose to the pallet center is 50 mm.
To simplify and speed maintenance, the 1,000-psi through-tool coolant unit features a 5-micron bag filter that can be replaced without interrupting the cycle. In addition, virtually all maintenance controls and gages are centrally located on the front of the machine to ease daily inspection. The machine also is designed to save floor space, with a low-profile chip conveyor that requires less room behind the machine.
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