Help please. Dip switches and mach 3 settings

[cropwell]

Ok. I.ll try the gcode and come back with a result.
Do you think it will work with a larger diameter copper pipe like those used for plumbing/heating? The soil is quite soft here, so driving it a meter into the ground would not be a problem.

that should be fine - the longer length you can drive in the better unless you hit a drain You could then fill the pipe with water to make a good earth (not a joke!).