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THE 1998 NIKKEN CNC-250FA IS A 10-INCH ROTARY TABLE WITH A 250 MM DIAMETER, HOUSED IN A HIGH-STRENGTH, PRECISION-CAST IRON CONSTRUCTION. ITS TABLE HEIGHT IS 140 MM (5.51 INCHES), AND ITS APPROXIMATE WEIGHT IS 40-50 KG (88-110 LBS). THE TABLE SUPPORTS A MAXIMUM RADIAL LOAD OF 150 KG (330 LBS) AND AN AXIAL LOAD OF 100 KG (220 LBS). THE DRIVE MECHANISM IS A HIGH-PRECISION WORM GEAR, ENABLING CONTINUOUS 360° ROTATION WITH A MAXIMUM SPEED OF 80 RPM. PRECISION IS MAINTAINED WITH AN INDEXING ACCURACY OF ±20 ARCSECONDS AND REPEATABILITY OF ±5 ARCSECONDS. THE UNIT IS TYPICALLY DRIVEN BY A SERVO MOTOR, SUPPORTS HORIZONTAL OR VERTICAL MOUNTING, AND IS COMPATIBLE WITH VARIOUS CNC MILLING MACHINES. CONTROL IS MANAGED BY THE NEC CORPORATION-MANUFACTURED NIKKEN Z3BF CONTROLLER, WHICH FEATURES 360-DEGREE STEPLESS OPERATION, A 130MM CHUCK DIAMETER, AND UTILIZES A STEPPING MOTOR DRIVE FOR PRECISE DIVISION AND ROTATION OF WORKPIECES.