Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: shag on October 23, 2020, 01:22:24 AM

Title: Running spindle causes false limit switch triggering
Post by: shag on October 23, 2020, 01:22:24 AM

I built pool cue lathe for someone and it worked perfect in my shop in Oklahoma but at his shop in Utah its triggering a false limit switch when spooling up the 220v spindle. The only differences is that the machine is at his shop now and is using a different computer. I never had this issue and it seems to be happening consistently at his shop. Im using NPN inductive proximity sensors for limit switches. Any help would be greatly appreciated. Thanks

Title: Re: Running spindle causes false limit switch triggering
Post by: guerra cues on October 23, 2020, 11:35:30 AM

Quote from: shag on October 23, 2020, 01:22:24 AM

I built pool cue lathe for someone and it worked perfect in my shop in Oklahoma but at his shop in Utah its triggering a false limit switch when spooling up the 220v spindle. The only differences is that the machine is at his shop now and is using a different computer. I never had this issue and it seems to be happening consistently at his shop. Im using NPN inductive proximity sensors for limit switches. Any help would be greatly appreciated. Thanks

Basically whenever I hit Cycle Start the spindle attempts to start for 2 seconds then stops, that's when I see that the limit switch has been triggered and when I go to the Diagnostics screen everything seems to be fine. The original poster built the CNC milling machine with Hybrid Steppers.

Title: Re: Running spindle causes false limit switch triggering
Post by: Graham Waterworth on October 23, 2020, 02:12:46 PM

Is the computer and machine grounded together, you may have ground loop issues if not.

Just run a ground cable to the computer chassis and the control box and the machine to stop this.