Setting up soft limits in UCCNC .. "Logic"

[JAZZCNC]

So to clarify on my machine with a back off of minus 5mm after machine has been homed the DRO will display -5mm when displaying machine co-ordinates.

I'm not sure that it works quite like that. It's been a few months since I set up a UCCNC machine but I think it Backoff works like most other controllers.? Which is that it looks for the Home switch then after hitting the switch Zero's the DRO, then backs off the set amount and Re-Zero's DRO again. When finished the MACHINE coordinates will show Zero.

It does this so you can have your HOME position or MACHINE ZERO at any point on the machine ie: Centre of travel, away from where the switch is physically located.

SOFT LIMITS are ALWAYS taken from MACHINE ZERO and limit the travel in the + & - directions. So in my Centre of travel example above with 1000mm of total travel, you would have Min soft limit = -500 and Max soft limit =+500.

If MACHINE ZERO was at the switch then soft MIN =0 Softmax =1000

Hope that helps clear a little of the confusion.!
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