FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

APPENDIX
D. NOMOGRAPHS
B–62764EN/01
872
First specify the class and the lead of a thread. The thread accuracy, α,
will be obtained at (1), and depending on the time constant of cutting feed
acceleration/ deceleration, the δ
1
value when V = 10mm / s will be
obtained at (2). Then, depending on the speed of thread cutting, δ
1
for
speed other than 10mm/ s can be obtained at (3).
Time constant of
servo system
V=40mm/
sec
V=20mm/
sec
(3)
0
δ
1
a
L
L
(1)
(2)
δ
1
(V=10mm/
sec)
T
1
T
2
Fig.D.1(b) Nomograph
See the graph in reference later in
the manual for an actual example.
NOTE
The equations for δ
1
, and δ
2
are for when the acceleration/
deceleration time constant for cutting feed is 0.
D How to use nomograph

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