280-0935

Access tool table

Press TOOL TABLE key and navigate to the active tool number causing the alarm.

Check the status line to identify which tool number was active when alarm occurred

Verify cutting edge parameters

Check CUT column for number of cutting edges and ANGLE column for cutting edge angular spacing. For standard tools: 2-flute endmill = CUT:2, ANGLE:180.

Incorrect cutting edge data can cause tool breakage during synchronized operations

Update tool geometry

Enter correct values: CUT = actual number of cutting edges, ANGLE = 360°/number of edges. Press ENT to confirm each entry.

Use ANGLE = 0 for single-point tools or when edge orientation is not critical

Test spindle orientation

Execute M19 command in MDI mode to verify spindle can orient to specific angular positions before running program.

Check spindle position display

Navigate to Machine Status screen and observe spindle angle display during manual spindle rotation. Value should change smoothly and consistently.

Ensure spindle is stopped before checking encoder connections

Verify encoder parameters

Access machine parameter MP7440 (spindle encoder resolution) and MP7441 (encoder type). Confirm values match actual encoder specifications.

Common encoder resolutions are 1024, 2048, or 4096 pulses per revolution

Test M19 spindle orient

Execute M19 S0 in MDI to orient spindle to 0°. Spindle should move to exact position and hold. Try M19 S90 for 90° position.

If spindle oscillates or fails to hold position, encoder calibration is required

Perform encoder reference

Execute spindle reference cycle through MOD function or machine parameter MP7450 to re-establish encoder zero position.

Access spindle parameters

Navigate to MOD > Machine Parameters and locate MP7400-7499 spindle configuration section.

Document current parameter values before making changes

Verify synchronization enable

Check MP7430 (spindle synchronization enable) is set to 1. Confirm MP7431 (sync tolerance) is appropriate for your application (typically 0.1-1.0 degrees).

Incorrect sync tolerance can cause false alarms or poor surface finish

Configure encoder monitoring

Set MP7445 (encoder monitoring) to enable position feedback verification. Adjust MP7446 (monitoring window) based on spindle dynamics.

Start with wider monitoring window and tighten as system stability improves

Calibrate spindle reference

Execute reference point calibration sequence through MOD > Calibrate Spindle to establish accurate angular reference.

Review active cycle

Examine the current program line causing the alarm. Look for G84 (rigid tapping), G85, or thread milling cycles that require spindle synchronization.

Use single block mode to identify exact program line triggering the alarm

Check cycle parameters

For rigid tapping cycles, verify that proper M29 (rigid tap mode) is programmed before the cycle. Confirm pitch and direction parameters are correct.

Missing M29 or incorrect pitch values can cause tap breakage

Verify tool call sequence

Ensure tool call (T number M6) occurs before the synchronization-dependent cycle and includes proper spindle speed (S value) and direction (M3/M4).

Add M19 after tool change to pre-orient spindle before synchronized operations

Test cycle in single step

Run the problematic cycle in single block mode with reduced feedrate to verify proper spindle synchronization behavior.