I've always moved all the axes away from the limit switches by around 10-15mm. This is fundamental to LinuxCNC so pulling all the axes away from the switches was a bit of a no-brainer before I really knew what I was doing. I'm sure we all have memories of things that had us confused for ages in the early days and are obvious now. This applies to any technical subject you are learning about for the first time. "How could I have ever NOT been able to ride a bicycle!?"

Oscilloscopes and spectrum analysers were my day-to-day screwdrivers and spanners for many years so at the first suspicion of spurious signals appearing where they don't belong they are the tools I'm going to reach for. We each have our different specialist knowledge and experience and it is the variety of skills, experience and knowledge among the members of a forum like this that make it so valuable.

Kit