1. Hole processing: before drilling on the machining center, the center drill must be used for positioning, and then the drill bit 0.5~2mm smaller than the drawing size shall be used for drilling, and the appropriate drill bit shall be used for finishing.
2. Reaming: For reaming the workpiece, first use the central drill to locate it, then use a drill 0.5~0.3mm smaller than the size shown in the drawing to drill holes, and then use a reamer to ream holes. During reaming, pay attention to controlling the spindle speed within 70~180rpm/min.
3. Boring: for boring the workpiece, first use the central drill to locate it, then use a drill 1~2mm smaller than the size shown in the drawing to drill holes, then use a coarse boring cutter (or milling cutter) to process until there is only about 0.3mm machining allowance left on one side, and then use a fine boring cutter with pre adjusted size for fine boring, and the subsequent fine boring allowance shall not be less than 0.1mm
4. Direct numerical control (DNC) operation: before DNC numerical control processing, the workpiece shall be clamped, the zero position shall be set, and the parameters shall be set. Open the processing program to be transferred in the computer to check, then let the computer enter the DNC state, and input the file name of the correct processing program. Press TAPE key and program start key on the processing machine tool, and the LSK word flashes on the machine controller. Press the Enter key on the computer to perform DNC data transmission processing.
