Safe and effective operation of a CNC lathe, whether vertical or horizontal, follows a systematic procedure. This guide outlines the fundamental steps.
1. Pre-Operation & Setup:
Safety First: Wear appropriate PPE (safety glasses, no gloves near spindles). Ensure machine guards are in place. Perform a visual inspection for damage or leaks.
Work Holding: Select and install the correct chuck, collet, or fixture. For a vertical lathe, secure the large workpiece onto the table/faceplate. For a horizontal lathe, mount the chuck/collect system on the spindle. Indicate and tram the setup to ensure it is true and square.
Tooling: Load the required turning, boring, and drilling tools into the turret or tool post. Set the tool offsets (geometry and wear) in the CNC control, referencing the machine’s home position or a presetter.
2. Program & Workpiece Zero:
Load the CNC program (G-code) into the machine’s controller, either via DNC or from local memory.
Set the Work Coordinate System (WCS) or Work Zero. This involves touching off tools on the face and OD/ID of a qualified workpiece or probe to establish the program’s origin in the machine’s physical space.
3. Dry Run & First Article Inspection:
Always perform a dry run! Run the program with the spindle off and optionally with the feed rate overridden to a low percentage. Visually verify that all tool paths are clear of collisions and that the sequence is correct.
After the dry run, machine the first part. Inspect it thoroughly using calibrated measuring instruments (calipers, micrometers, CMM) to verify all dimensions are within the drawing’s tolerance. Adjust tool wear offsets as necessary.
