Limit switch's - best configuration?

[audioandy]

John
The way I have wired my home switches and limits is that if it hits a limit at the home switch end the home switch is made at the same time, so could a bit of script be used that checks to see if a home switch is made then get Mach to drive that axis away from the home/limit then back onto the home? Then any axis thats not seeing a home switch drive it in the oppisite direction?

(hope that makes sense)

Andy

[John S]

Only way for this to work is to use 6 inputs and then get a Brain command to check and do the necessary work.
Problem here is you need another PP

In the normal method of one input for Z+ and Z- one switch can be home as well. It will work as you say hits the switch backs off and touches back onto the switch, that's part of Mach

And that's the most infuriating part, it knows this and can do this but Brian can't be arsed to get it to do the same with limits, preferring instead to piss about with fancy gee gaws that other 'want' and never use whereas this is a basic CNC application and should have been in years ago.

'Rant over '

[HiltonSteve]

Right, I am getting really confused now....

The guy in the mach3 video (that sent me to sleep) talking about limits and home switch's shows mach with 4 limit switch's wired (2 axis) and then goes through the mach3 configuration, can't remember how many inputs he has them wired to. I will watch it again and try and stay awake this time, see if I missed something.

He uses the limit switch's as overtravel limits but also as home switch's, one limit switch doing both jobs. When he press's the machine ref button on the screen the axis jog one at a time to the limit then jog off then auto zero (if you have set auto zero function). Then he goes into how to set up soft limits, looks straightforward and exactly what I want.

Surely it would not matter which overtravel limit switch it hit as long as it stops, the soft limits should cut in before the actual limit switch's as the limit switch's should only be your last line of defence before the machine decides to break itself. You should be able to see which switch has been activated and sort it accordingly.

I want to get them on before my lad starts using the machine, safety first and all that!

Tell you what, instead of ranting on about it, tonight I will mount some switch's on my machine and try it for myself.

SO...

Forget about the wiring and configuration for a min, what switch's have you tried and work well? Got some of those honeywell ones (pic above) but they are a bit big for the Y and Z axis, should be ok for the X though.