HOME / Q & A / About Mechanism / 1- Machanical & processing Questions ● The comparison of CNC-350 vs CNC-500A4 (workpiece dia. and keyway length) Q1: Please refer to below mention size of our component . 4-1. Max. Work piece diameter – 2000 mm 4-2. Min. & Max. bore size – 120 to 400 m 4-3. Min. and Max. Width of Keyway.--- min -32 mm & Max-90 mm 4-4. Min. and Max. Length of Keyway.--- min-100 mm & Max-400 mm ： Ans: Please see attached pdf.