6424

Access Diagnostics > Tool Management via MMC. Verify the tool table is loaded and review all defined tool numbers. Cross-reference the tool number called in the NC program (T-word) against the displayed tool list.

Ensure the correct tool management type (MD 6000) is active: 0=standard tool management, 1=advanced tool management.

In NC program, check the T-word command syntax. Verify tool number is within the range defined by MD 6010. If tool number is out of range, either reduce the tool number or increase MD 6010 value.

If tool is missing entirely, add the tool to the tool table via MMC Tool Management menu and assign required tool geometry offsets (length D, radius R) using MD 6170-6180 tool offset parameters or graphical tool editor.

After modifying tool table, perform 'Reset to defaults' via Diagnostics > Initialize to ensure NCK reloads tool data.

Trigger tool motion command again (M6 or T-word) after tool is properly defined.

Open MMC > Diagnostics > Tool Management. Locate the tool number referenced in alarm 6424 and check its 'Status' field. Look for flags such as 'damaged', 'unavailable', or 'wear limit exceeded'.

Tool status can be set automatically if wear counters (MD 6500-6520 tool life management) trigger thresholds, or manually via the tool editor.

If status shows 'wear limit exceeded', review tool life parameters MD 6500 'Tool life evaluation', MD 6510 'Tool life value', and actual tool usage counters. Reset the tool life counter (if applicable) or increase the tool life limit value in MD 6510.

Verify actual tool wear physically. Do not reset counters if tool is genuinely worn; instead, replace the tool entry.

Change tool status from 'unavailable' to 'ready' via the tool editor. In MMC, right-click the tool and select 'Set Status to Ready' or edit the tool status field directly. Save changes.

Ensure tool is physically installed in spindle or magazine before setting status to 'ready'.

Re-run the NC program or re-issue the M6/T-word command.

In MMC Diagnostics, verify the current active channel and spindle (Status > Channel Info). Compare this against the tool's assigned spindle/channel in the tool table (Tool Management > Properties > 'Spindle Assignment' or equivalent field).

Multi-spindle systems require explicit tool-to-spindle assignment. Check MD 6100 'Tool assignment to spindles': value 0=any spindle, 1=spindle 1 only, 2=spindle 2 only, etc.

If tool is assigned to wrong spindle/channel, edit the tool record in MMC Tool Management and reassign it to the correct spindle, or modify the M6/T command in the NC program to select the correct spindle first (M3/M4/M5 for spindle selection).

Ensure tool changer and spindle are compatible. Some systems require manual or automatic tool magazine positioning before tool change.