Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: ihodii on April 10, 2026, 06:13:49 AM

Title: Spindle won't stop with M5 or Reset (Mach3)
Post by: ihodii on April 10, 2026, 06:13:49 AM

Hi, I have a CNC machine running Mach3.

The machine was already wired when I got it, I don’t have documentation. :(

Everything works (X, Y, Z axes), and the spindle starts with M3.

BUT:
The spindle DOES NOT STOP with M5, Stop, or Reset.
It only stops when I close Mach3.

I tried:
- Active Low on/off
- Different Output pins (Port 1 Pin 16 etc.)
- Spindle setup settings

Current setup:
- Output #1: Port 1 Pin 16
- Spindle Relay enabled
- Using relay (not sure about VFD)

Question:
Why would spindle ignore M5 and keep running?
Is this wiring issue or Mach3 configuration?

Thanks!