Code to plunge Z gradually and then retract along length of a profile path.

[Rufe0]

Ok yeah well if its exactly that shape you want to make (spiral) you should learn some gcode, its very simple to do in gcode. Something like

G0 X10 Y10
G2 X20 R5 
G2 X11 R4.5 
G2 X19 R4 
G2 X12 R3.5 
G2 X18 R3 
G2 X13 R2.5 
G2 X17 R2 
G2 X14 R1.5 
G2 X16 R1

Then it would be trivial to add your Z depth.

If you wanted to use code generated by a program its probably going to be 1000s of tiny straight line moves. I could perhaps make a small program for you that will tack on the Z depth but it wouldn't be as good as hand written code.