4. 3
Threading Cycle
G78
0.03;160 R1Q0200601G78 PN…
;02R7F2146.92P513.4250 Q-ZG78 X25.706N…
F: is the lead
Pitch = Lead/no.of starts = 7/2 = 3.5 mm
X= Diameter – 2*0.6134*Pitch = 30-2*0.6134*3.5 = 25.706 mm
and then deduce’2you should calculate Q2To calculate Q
2number of passes (n) then calculate Q
=’2Q
Where:
Hr Roughing Full depth.
1R-2= PrH
).Pitch0.6134depth (Total2PWhere
offset.FinishroallowanceFinish1R
(0.03 0.05 mm)
Hr = (0.6134 × 3.5) - 0.03 = 2.1169 mm
)mm0.080.06cut (min depth of1R*.
ضعف يكون أن ويفضلFinish offset
=’2Q
mm5004= 0.’2Q
r’/H2Q=r /H=’2Q
2
112 QQHr
2
)06.0()06.01169.22(
n n
5. 4
n = n = = 17.896
n = 17 Roughing Passes (Round down or up)
will be :2So Q
mm5134= 0.=/rH=2Q
So the code will be as following
N… G78 P020060 Q60 R0.03;
N… G78 X25.706 Z-50 Q513.4 P2146.9 F7 R0;
You might notice that:
Q1 is in μm
R1 is in mm
Q2 is in μm
P2 is in μm
2'Q
Hr
2
5004.0
1169.2
2
17
1169.2
n