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another update

pgf wrote:

 Given that the length of the bit is variable, there is no single actual lower hardware limit. It depends on how far the bit protrudes from the collet. Given that, what's the use of the limit? When would it do me any good?

Adding an upper Z limit switch is usually pretty easy and makes it easy to use Linuxcnc as intended. eg Work in G54 offsets.
Normally, you would jog down so the tool touches the workpiece and set your g54 offset. 
Using work coordinates eg G54 was my biggest learning.