Need Help!- Circle with hatching

[erkan20069]

I have to do a G-Code milling a circle with a simple hatching inside.
i want to change just 2 parameters --> circle diameter and hatching spacing.
please help!

[erkan20069]

jpg

[Pandinus]

Trig. is your friend...



http://www.1728.com/circpart.htm




whenever 2 chords of a circle intersect at a point E, then AE • EB = CE • ED

if we use the diameter of the circle through the center as one chord then

let H be the hatch distance, and D the diameter, while AE=EB

AE • EB = CE • ED

AE • AE = [D+H] • [D-H]

AE = SQAREROOT( [D+H] • [D-H] )



this will get you started

(This code was tested in Mach3)

#1=10 (diameter)
#2=.5 (hatch)
#3=FIX[#1/#2]


#4=0
m98 p1 l#3
m30

o1
#5=[sqrt[#4*[#1-#4]]/2]
g0 x[#4*#2] y#5
g1 y[-1*#5]
#4=[#4+#2]
m99

Oh no I think I just made a geek of myself.