Fagor alarm 1004: Zero spindle speed

What it means

Function G63 (tapping with feed-per-revolution style synchronized motion) was executed while the commanded spindle speed is zero, leaving no basis for synchronization. Program an S value before the tapping block. On machines where S comes from the PLC or a macro, check that logic too.

Likely causes

• S word missing before G63 block
• spindle speed overridden or zeroed by PLC/macro logic
• gear range selection forcing zero commanded speed