Spiral circle

[NaderHaddad]

Hi,
I need a program to do a spiral circle using four variables:

X,Y "center of circle"
Circle radius (in my prog=RDS
Step (space between lines)

I did it in a primitive way, but I know it can be done in a more professional way (mybe using sin and cosin)

my program:

__________________________________________________ ____________________

N20 XX=300 YY=300 DIM=225 RDS=DIM/2
N30 PAN=2 ST1="C1_2" ST2="NULL" ST3="NULL" L=PCUA
N40 TDM=12.7 DD=TDM/2 ;TDM=tool diameter
N50 X=XX Y=YY+RDS Z=PRK TP=2 PRF=12 F=6 VF=4 AX=X,Y,Z G41 PFLO=0 L=PON TRZ=0
N60 G3 X=XX Y=YY-RDS I=XX J=YY
:FOR B=1 TO RDS/DD
N70 G3 X=XX Y=YY+RDS-(DD*B) I=XX J=YY-(DD/2)
N80 B=B+1
N90 G3 X=XX Y=YY-RDS+(DD*B) I=XX J=YY+(DD/2)
:ENDFOR
N100 G1 XI-0.01 Z=PRK
N110 L=PSU
N120 L=POFF
%

__________________________________________________ ____________________

Note:
I know that the external circuit is incomplete, I can fix it later

Thank you in advance

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[deadlykitten]

hi, declare a step radial step, like 10mm for example : thus, the radius goes like this :

angle radius
0 0
90 2.5
180 5
270 7.5
360 10

360+0 10+0
360+90 10+2.5
360+180 10+5
360+270 10+7.5
360+360 10+10


actual_radius = step * ( how_many_full_circles + actual_angle / 360 )
... 0 <= actual_angle <= 360*

create a code & loop it; discretization is a bit tricky, because it is not direct proportional with the angle, but more with the radius ( i have to do the math to check this dependency )

using a variable parameter to achieve a constant discretization is another thing, that may be hard to implement within a cnc soubroutine; i can develop this if you wish / that's all

[NaderHaddad]

I'll try it, thanks