Quote Originally Posted by Neale View Post
As it happens - every time I use the machine! But only because I use the same switch for home and limit. Initial homing is done at some fraction of machine speed, and experience says that the physical machine limits can take the load if all else fails.
Every machine I build is done this way for this reason among others, why have extra limit switches which very rarely get used or tested then the extra wires and wiring which open up noise opportunities.
On the issue of reliability, I have had the same Chinese proximity switches on my machine for over 6yrs, they are still working and accurate as the day I fit them and we use the machine every day.
Likewise, on the machines, we build and sell I fit the same switches so have fit laterally 1000's and I've probably had less than 25 failures in the last 10yrs, most of which just haven't worked out of the packet with very few actually failing when in use.