5238-E P-101
SECTION 7 FIXED CYCLES
[Supplement]
When determining the F word value, use the following equation:
Using the equation above, the F value can be calculated as follows:
D = n
×
(F
0
_ )
where,
D : displacement after "n" revolutions, (mm)
n : number of revolutions required for displacement D, min
-1
{rpm}
F
0
: thread lead at start of thread cutting cycle
E : lead variation amount per revolution
_ : increasing or decreasing lead
"+" : increasing lead
"–" : decreasing lead
+
+
2
n
×
E
42 = 7 (F
0
+ )
F
0
= 2.5
2
nE
2
7
×
1
D = n
×
(F
0
+ )
