280-05E4

Access tool table

Press MOD key, select 'Tables' and open TOOL.T table to review tool definitions.

Use CTRL+F to quickly search for T0 entries in large tool tables

Identify T0 entries

Scan the T column for any entries showing tool number 0 and note the row numbers.

Do not modify tool table while program is running or spindle is active

Renumber or delete T0 entries

Change tool number to valid range (T1-T99999) or delete the entire row using DEL key.

Start tool numbering from T1 and maintain sequential order for better organization

Save and validate

Press END key to save changes and cycle power to clear alarm condition.

Backup tool table before making changes using data export function

Open NC program editor

Press PGM MGT key and select the active NC program causing the alarm.

Check the line number displayed with the alarm for faster location

Search for T0 references

Use search function (CTRL+F) to find all instances of 'T0' or 'M06 T0' in the program.

Ensure machine is in STOP mode before editing NC programs

Replace with valid tool calls

Change T0 to appropriate tool number (T1, T2, etc.) or use M06 without tool number for spindle empty command.

Use 'M06' alone or 'T-1' for explicit empty spindle command on newer TNC versions

Test program syntax

Run syntax check using 'Test Run' mode to verify no additional T0 references exist.

Use program simulation to verify tool change sequence before actual machining

Review CAM post-processor settings

Check post-processor configuration for minimum tool number settings and empty spindle handling.

Most Heidenhain posts should start tool numbering from T1 minimum

Modify post-processor tool range

Set minimum tool number to 1 in post-processor tool numbering parameters.

Coordinate with programming department before changing post-processor settings

Regenerate NC program

Repost the toolpath with corrected settings to eliminate T0 references.

Create a backup of original program before reposting

Validate output program

Check regenerated program for proper tool numbering starting from T1 and proper M06 syntax.

Establish standard post-processor templates to prevent recurring issues

Check import file format

Open the imported tool data file (.T or .CSV) and verify tool number column for zero values.

Use text editor to examine file structure before importing to TNC

Clean import data

Remove or renumber any T0 entries in the source file before re-importing to TNC.

Maintain tool number consistency with setup sheets and fixture documentation

Clear existing tool table

Delete current TOOL.T entries using MOD > Tables > TOOL.T and clear all rows.

Export current tool table as backup before clearing

Re-import corrected data

Use TNC file management to import the cleaned tool data file and verify proper tool numbering.

Import to temporary table first to validate before copying to active TOOL.T