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Check Tool Offset Values

Press OFFSET, select TOOL tab, verify H-offset values are positive and reasonable for your tooling setup.

Tool length offsets should typically range from 0.1 to 6 inches depending on your tool holder system

Verify G43 Programming

Review program for proper G43 H__ usage and ensure the H-number corresponds to correct tool offset register.

Never use negative values in tool length offset registers

Test with Manual Tool Change

In MDI mode, command G43 H01 Z1.0 with a known good offset to verify proper Z-axis positioning.

Reset and Re-measure Tools

Use TOOL SETTING page to re-measure tool lengths if offsets appear corrupted or incorrect.

Check Parameter 221

Press SETTING, select PARAMETERS tab, locate Parameter 221 and verify it matches your machine's actual Z-travel specification.

Typical VF-2 machines have -16.00 to -20.00 inch Z-travel depending on configuration

Compare to Machine Specifications

Reference your machine manual or nameplate data to confirm correct Z-axis travel limits for your specific Haas model.

Adjust Parameter if Necessary

If Parameter 221 is incorrect, modify it to proper specification and press WRITE/ENTER to save changes.

Only modify this parameter if you are certain of your machine's physical travel limits

Check Limit Switch Status

Press CURRENT COMMANDS, select DIAGNOSTICS page, verify -Z LIMIT input status - should show OFF when not activated.

Manually Inspect Z-Axis Position

Visually confirm Z-axis position relative to physical limit switch and check for mechanical interference or debris.

Ensure spindle is stopped and machine is in safe condition before inspection

Test Limit Switch Operation

Carefully hand-jog Z-axis away from limit switch using JOG mode at slow feedrate (0.0001 or 0.001 increment).

Perform Reference Return

Execute HOME G28 or ZERO RETURN operation to re-establish proper machine coordinate system reference.

Review Work Offset Values

Press OFFSET, select WORK tab, check G54-G59 Z-axis values for unreasonable or incorrect entries.

Verify Active Work Coordinate

Check CURRENT COMMANDS display to confirm which work coordinate system (G54, G55, etc.) is currently active in your program.

Recalculate Work Offsets

Use PART ZERO SET function or manually calculate proper work offset values based on your part setup and fixture location.

Test with Single Block

Run program in SINGLE BLOCK mode to verify Z-axis moves stay within acceptable range after offset correction.

Review Program at Alarm Line

Check the program line number displayed when alarm occurred, look for unreasonable Z-axis coordinates or missing G43 commands.

Verify Modal Commands

Press CURRENT COMMANDS to check active G-codes, ensure G43 (tool length compensation) is active and proper work coordinate system is selected.

Simulate Program Path

Use graphics simulation mode to visualize tool path and identify where Z-axis violation occurs without machine movement.