Fanuc Series 15i/150i-MA (Programming) Operators Manual

D.NOMOGRAPHS APPENDIX B-63324EN/03
- 770 -
D.2 SIMPLE CALCULATION OF INCORRECT THREAD
LENGTH
Explanations
- How to determine δ
2
)mm(
*1800
LR
2
=δ
R : Spindle speed (min
-1
)
L : Thread lead (mm)
* When time constant T of the servo system is 0.033 s.
- How to determine δ
1
)mm)(aln1(
*1800
LR
2
=δ
)mm)(aln1(
2
δ=
R : Spindle speed (min
-1
)
L : Thread lead (mm)
* When time constant T of the servo system is 0.033 s.
Following a is a permited value of thread.
a-1-lna
0.005 4.298
0.0 3.605
0.015 3.200
0.0 2.912
Fig. D.2(a) Incorrect threaded portion
δ
2
δ
1

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