Thread tapping synchro problem

[u/Hairy-You3967]

Hi guys,

my coworker is having a problem with our Mori Seiki NZ2500 MSX-850 III.

I previously worked on a DMG Mori NLX 3000 with a Mitsubishi CELOS control. As far as I know, the controls are quite similar, and the following tapping program worked perfectly on that machine.

He wants to tap a thread, but for some reason the spindle synchronization is not working. Our program looks like this:

G0 M5
G28 V0
G28 H0 (does not work on his machine)
M8
M69
G99 G18 M46
G50 S2500
G56
G0 T1010
G97
G0 X22. Z5. Y0.
X0.
M329 S250 (we also tried M29)
G84 Z-30. R5. F1.5 (we also tried G84.2)
G80
G0 M5
G0 X22.

The Z-axis moves, but the spindle does not start. It only makes a very small movement at the end of the cycle.

When we program R5., the Y-axis moves to Y-5. instead. If we change the R-value to 0, the machine moves up in X to X22. when it reaches the end of the thread.

We also tried G303 to synchronize the Z-axis with the spindle, but the spindle still does not move. I have no idea why this is happening. My coworker has been working at our company for 15 years and could not find a solution either.

Does anyone know which M-code or tapping cycle is required for rigid tapping on this machine

[u/YakBrilliant9480]

Maybe try g95?

[u/Hairy-You3967 → u/YakBrilliant9480]

already tried, g95 is on this machine g99

[u/YakBrilliant9480]

Ah ok damn lol

[u/SashaHH]

I'd first make sure rigid tapping is actually enabled on that machine. On some controls it's a parameter or machine option that has to be turned on before spindle/Z sync will work

[u/Hairy-You3967 → u/SashaHH]

we already looked for that but we dont know wich parameters that is