A Realmeca TD 720 T turret can rotate correctly in manual mode yet ignore tool changes from IMD or a part program when the control has not been synchronized with the turret's physical tool position. The documented recovery is to reference the machine, position the turret at tool 1, and register that position with M100 T1.
Identify the turret initialization fault
The reported symptom was consistent: manual turret rotation worked, but T4 M6 in IMD and T4 D4 M6 in a program did not change tools. Because the turret remained operable manually, the evidence points to missing tool-position initialization rather than proving a turret motor failure.
| Observation | Engineering interpretation |
|---|---|
| Turret rotates manually | The mechanical drive can move; this does not verify automatic position tracking. |
| IMD and programmed changes fail | Check whether the control knows the current turret station. |
M122 fails in IMD |
Do not use this command as the TD 720 T remedy. |
Initialize the turret position
- Complete the machine's POM reference-return procedure.
- Use manual control to place the tool turret physically at station 1.
- In IMD mode, enter
M100 T1. - Select
LF, then press cycle start. The evidence does not define whetherLFis a key or control function, so follow the machine's displayed control labels. - Retry the required tool change in IMD, then verify it from the part program.
M100 T1This command establishes station 1 as the reference from which the control identifies the other turret stations.
Verify automatic operation
After initialization, command a tool station while observing the turret. Confirm that it indexes, stops, and identifies the requested station before running production. Then test the program call separately. This isolates IMD operation from program syntax or execution-state problems.
Do not apply this sequence indiscriminately to another machine configuration. A separate report involving a Realmeca C3X milling machine described loss of motion after commands based on this turning-machine procedure. Machine type and turret or magazine design must match before using M100 T1.
Investigate initialization lost at startup
If the TD 720 T requires the POM and M100 T1 sequence after every power-up, repeatable loss of stored position is confirmed, but the cause is not. A failed automation-controller battery was suggested only as a hypothesis. Record whether the initialized station survives a controlled shutdown, then inspect the applicable machine documentation and retention hardware before replacing components.
FAQ
Why does my Realmeca TD 720 T turret work manually but not with T4 M6?
The control may not know the turret's current station. Complete POM, manually position station 1, and register it in IMD with M100 T1.
What is the Realmeca TD 720 T turret initialization command?
With the turret physically at station 1 after POM, enter M100 T1 in IMD, select LF, and press cycle start.
Why must I initialize the turret after every power-up?
The stored tool position may not be retained. A controller battery fault is only a hypothesis; first verify the behavior across a controlled shutdown and consult the machine documentation before replacing hardware.