3 G/M Codes
3 - 27
Q
: Start-angle of thread cutting; default value: Q=0 (range of angle is
0-359 without a decimal point)
E
: Number of threads per inch; range: 1.0-100.0. This setting shall not
appear when an F setting is given.
Details:
1.
Both fine cut and rough cut of the thread cutting proceed along the same path. The
cutting action on the Z-axis does not start until the Grid signal is received from the
spindle. All repeated cutting actions start at the same point.
2.
Due to delay of the server system, imperfections could result at both ends of the
thread (S1 and S2). To avoid this problem, the thread length specified in the program
should be slightly longer than the actual length of the processed thread. S1 and S2 are
leads. The length of S1 and S2 is estimated using the formula below.
S1 = (S * F/1800) * (-1 - Ln A)
S2 = (S * F/1800)
S1, S2 : Imperfect thread length, mm
S
: Spindle speed, rpm
F
: Thread pitch, mm
A
: Acceptable thread error
Relationship between A and (-1 - Ln A):
Table 3-8
A
-1 - Ln A
0.005
4.298
0.010
3.605
0.015
3.200
0.020
2.912
0.025
2.689
Example
:
Ex 1: Non-tapered thread cutting
Содержание H6D-T
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