Helical interpolation loop calculation

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N400
(LOOP FUNCTION)
(FOR EXAMPLE CROSSHOLE HELICAL MILLING)
G28U0.V0.
G30W0. 
T0505
G19
#110=5.(STARTPOINT IN X) 
#111=4.625(ENDPOINT IN X)
#112=.15(BACK OFF FROM BOTTOM FOR REDUCED FEED)
#113=.05(FEED PER HELICAL REVOLUTION)
#114=.02(FEED PER HELICAL REVOLUTION AT BOTTOM)
#115=.75(TOOL DIAMETER)
#116=1.(DIAMETER OF HOLE)
#117=20.(FEEDRATE) 
#118=10.(REDUCED FEEDRATE AT BOTTOM) 
 
(#119 = ENDPOINT IN X WITH OR WITHOUT BACKING OFF AT BOTTOM) 
IF[#112EQ0]THEN#119=#111 
IF[#112GT0]THEN#119=[#111+2*#112]
 
#120=FUP[[#110-#119]/2/#113](NO. OF LOOPS) 
#121=[#110-#119]/2/#120(CALCULATED FEED PER HELICAL REVOLUTION)
 
(#122 ROUNDING MIGHT NOT BE NECESSARY) 
#122=[[ROUND[#121*10000]]/10000](ROUNDED CALCULATED FEED PER HELICAL REVOLUTION) 
 
#123=FUP[#112/#114](NO. OF LOOPS)
#124=#112/#123(CALCULATED FEED PER HELICAL REVOLUTION) 
 
(#125 ROUNDING MIGHT NOT BE NECESSARY) 
#125=[[ROUND[#124*10000]]/10000](ROUNDED CALCULATED FEED PER HELICAL REVOLUTION) 
 
G0X#110(X STARTPOINT)
 
G98G3G41V-[[#116-#115]/2]J-[[#116-#115]/4]F#117
 
#100=1 
WHILE[#100LE[#120-1]]DO1 
 
G3J[[#116-#115]/2]U-[#121*2] 
 
#100=#100+1
END1 
 
G3J[[#116-#115]/2]X#119(FINAL HELICAL PASS)
 
IF[#5001GT#111]GOTO1234(#5001 = CURRENT X POSITION)
 
G3J[[#116-#115]/2](FINAL FLAT BOTTOM PASS) 
 
V[[#116-#115]/2]J[[#116-#115]/4](RETURN TO CENTER OF HOLE) 
 
GOTO1235 
 
 
 
N1234
#100=1 
WHILE[#100LE[#123-1]]DO1 
 
G3J[[#116-#115]/2]U-[#124*2]F#118
 
#100=#100+1
END1 
 
G3J[[#116-#115]/2]X#111(FINAL HELICAL PASS)
 
G3J[[#116-#115]/2](FINAL FLAT BOTTOM PASS) 
 
V[[#116-#115]/2]J[[#116-#115]/4](RETURN TO CENTER OF HOLE) 
 
N1235
G0X#110(RETURN TO X STARTPOINT)
G40
G18
M0 
 
(*************************)
 
N500
(LOOP FUNCTION)
(FOR EXAMPLE FACEHOLE HELICAL MILLING) 
G28U0.V0.
G30W0. 
G17
T0505
G0X10.Z1.
#110=.05(STARTPOINT IN Z)
#111=-.395(ENDPOINT IN Z)
#112=.2(BACK OFF FROM BOTTOM FOR REDUCED FEED) 
#113=.05(FEED PER HELICAL REVOLUTION)
#114=.02(FEED PER HELICAL REVOLUTION AT BOTTOM)
#115=.75(TOOL DIAMETER)
#116=1.(DIAMETER OF HOLE)
#117=20.(FEEDRATE) 
#118=10.(REDUCED FEEDRATE AT BOTTOM) 
 
(#119 = ENDPOINT IN Z WITH OR WITHOUT BACKING OFF AT BOTTOM) 
IF[#112EQ0]THEN#119=#111 
IF[#112GT0]THEN#119=[#111+#112]
 
#120=FUP[[#110-#119]/#113](NO. OF LOOPS) 
#121=[#110-#119]/#120(CALCULATED FEED PER HELICAL REVOLUTION)
 
(#122 ROUNDING MIGHT NOT BE NECESSARY) 
#122=[[ROUND[#121*10000]]/10000](ROUNDED CALCULATED FEED PER HELICAL REVOLUTION) 
 
#123=FUP[#112/#114](NO. OF LOOPS)
#124=#112/#123(CALCULATED FEED PER HELICAL REVOLUTION) 
 
(#125 ROUNDING MIGHT NOT BE NECESSARY) 
#125=[[ROUND[#124*10000]]/10000](ROUNDED CALCULATED FEED PER HELICAL REVOLUTION) 
 
G0Z#110(Z STARTPOINT)
 
G98G3G41V-[[#116-#115]/2]J-[[#116-#115]/4]F#117
 
#100=1 
WHILE[#100LE[#120-1]]DO1 
 
G3J[[#116-#115]/2]W-#121 
 
#100=#100+1
END1 
 
G3J[[#116-#115]/2]Z#119(FINAL HELICAL PASS)
 
IF[#5001GT#111]GOTO1234(#5003 = CURRENT Z POSITION)
 
G3J[[#116-#115]/2](FINAL FLAT BOTTOM PASS) 
 
V[[#116-#115]/2]J[[#116-#115]/4](RETURN TO CENTER OF HOLE) 
 
GOTO1235 
 
 
 
N1234
#100=1 
WHILE[#100LE[#123-1]]DO1 
 
G3J[[#116-#115]/2]W-#124F#118
 
#100=#100+1
END1 
 
G3J[[#116-#115]/2]Z#111(FINAL HELICAL PASS)
 
G3J[[#116-#115]/2](FINAL FLAT BOTTOM PASS) 
 
V[[#116-#115]/2]J[[#116-#115]/4](RETURN TO CENTER OF HOLE) 
 
N1235
G0Z#110(RETURN TO Z STARTPOINT)
G40
G18
M0 
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