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The Yama Seiki horizontal boring mill machine, the BL series, is offered in two types of boring spindle: the quill BL-S series and the ram-type BL-FM series. The BL-S series machine is equipped with 22/26 kW (30/35 hp, cont./30 min. rating) stepless variable speed range with a two-step gear box up to 2,400 rpm. The spindle is 120 mm (4.7”) diameter diameter with 600-mm travel providing high rigidity and stability for heavy cutting applications, the company says. The BL-FM series machine is also available with 22/25 kW (30/35 hp, Cont. /30 min. rating) stepless variable speed range up to 6,000 rpm in a 480 × 480-mm square section. Spindle temperature is controlled by oil spindle chiller. The 40-tool automatic tool change system is standard on the BL series. The ATC is located outside of working area in order to keep coolant and chips off the magazine and tool change arm. Random selecting tool eliminates indexing time for tool magazine. The strong and heavy-duty structure of "BL" series machines are designed by a 3D CAD system. The column and the bed are specially designed to meet the rigid requirement for heavy-duty machining, the company says. The working capacity is 78.4”~157.48 × 70.9” (opt. 94/5” × 51.2” (opt. 70”) × 23.6” with maximum table load of 22,000 lbs.
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