S1000 M3
G54 G90 G0 X0 Y0 Z30.
M3 S1000
G65 P100 A28. C5. U0 V30 W1 D200 H12 Q0.5F300 Z-5 R0
M30
%
O100
#7=#7/2
#19=#18
N1Z30
#16=#21+[#23-1]*#22
#24=#7*COS[#16]
#25=#7*SIN[#16]
#5=[#1-#3]/2
#6=#5+#24
G0 X#6 Y#25
#18=#19
Z[#18+1.]
G1 Z#18 F[#9*0.2]
WHILE[#18GT#26]DO1
#18=#18-#17
IF[#18LE#26] THEN #18=#26
G3 I-#5 Z#18 F#9
END 1
I-#5 F[#9*0.6]
G1X[#6-1.] Z[#18+0.1]
G0 Z30.
#23=#23+1
GOTO1
M99
%