What Are The Operating Steps For A CNC Vertical Lathe?

The operating procedures for a CNC vertical lathe cover key steps, including startup preparation, program processing, workpiece clamping, tool setting, machining execution, machining monitoring and adjustment, and shutdown maintenance.

► Check the CNC lathe status

Confirm that lubricating oil and coolant are sufficient, and replenish if insufficient.

Clean the CNC machine guideways and sliding surfaces of any obstacles, iron filings, and debris, and apply lubricant.

► Power On

Turn on the main switch in the CNC lathe electrical cabinet to start the CNC system and power on the machine.

Wait for system initialization to complete (usually requires a 3-5 minute warm-up period).

► Return to the Reference Point

Manually return the machine to the reference point (this step is required for incremental control systems), typically returning to the +X direction first, then the +Z direction, to establish the coordinate system reference.

►Program Writing and Input
Complex programs are recommended to be written using a programming machine or computer and transferred to the CNC machine via a floppy disk or communication interface.
Simple programs can be entered directly on the CNC lathe's CNC control panel using the keyboard or MDI mode.

►Program Editing and Verification
To modify a CNC lathe program, set the mode selector switch to the EDIT position and use the editing keys (INSERT, DELETE, ALTER, etc.) to make changes.
Run the program using the CNC machine's lock function to check for logical errors. Ensure that no errors are present before proceeding with actual machining.

► Cleaning and Positioning
Clean the contact surfaces between the workpiece and the CNC lathe fixture to prevent impurities from affecting accuracy.
Use an appropriate fixture for the CNC lathe (such as a three-jaw chuck, a four-jaw chuck, or a specialized fixture) and initially position the workpiece using reference surfaces or locating pins.

 

 

 

► Alignment and Clamping
Use a dial indicator to check the axial runout of the CNC lathe workpiece (≤0.02mm) to ensure concentricity.
Apply segmented preload to prevent localized deformation; thin-walled parts require expansion sleeves to prevent deformation.
After clamping, check the balance of the CNC lathe workpiece to prevent vibration during high-speed rotation.

►First Tool Setting
Z-axis tool setting: Manually cut the workpiece end face on the CNC lathe. Keep the X-axis stationary and use the OFFSET function to enter Z0.
X-axis tool setting: Manually cut the workpiece outer diameter. Keep the Z-axis stationary, measure the outer diameter, and then enter the X value (e.g., X50.0).
Enter tool parameters (e.g., tool tip radius R, tool tip imaginary position T).

►Subsequent Tool Setting
After changing tools, lightly touch the flattened end face or outer diameter and use the OFFSET function to enter relative coordinate values ​​to ensure that all tool coordinate systems on the CNC lathe are consistent.

► Starting Processing
Select a program in memory and press the Cycle Start button to start processing.
Use the Feed Override switch to adjust the feed rate to suit different processing stages.
► Pause and Measurement
During CNC lathe processing, press the Feed Hold button to pause, observe the processing progress, or perform manual measurements.
After measuring, press the Cycle Start button on the CNC lathe to resume processing.

► Real-time Monitoring
Use the CRT screen to display tool position, program status, and machine parameters to ensure normal CNC lathe processing.
► Dimension Adjustment
If the first-piece trial cut on the CNC lathe fails, modify the tool compensation parameters (X/Z-axis tool wear values) or adjust the workpiece coordinate system (G54-G59).
First-piece calibration is required for mass production on CNC lathes, and the machine zero offset register is updated.

 

► Processing Completed
Park the CNC lathe's tool post in the tool change position away from the workpiece and remove any chips and cutting fluid.
► Shutdown Procedure
First, turn off the CNC machine power, then the system power, and finally the main power.
► Daily Maintenance
Clean the CNC machine surface and lubricate the guideways to extend equipment life.