HUST CNC H6D-T Manual
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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.
Fig.3-20
Details:
1. For single stage thread cutting, fine cutting and rough cutting are along the same path,
therefore when starting the thread cutting, it waits for a GRID signal to be detected
from the spindle position before starting Z-axis for cutting action (L parameter left
blank or set as 0). Each repeated cutting starts from this fixed point.
2. For multi-stage thread cutting, based on technical requirements, in general the
subsequent stages starting from the second stage do not need to detect the GRID
signal mainly for connecting smoothly with the previous stage. (See Fig.3-20)
3. In general incomplete end threads (S1 and S2) occur due to time lag in the servo
system, therefore the specified thread length shall be slightly longer than the
processed thread length, S1 and S2 are called thread leads. A simple way to
calculate the length of incomplete threads S1 and S2 is shown as follows:
S1 = (S * F/1800) * (-1 - Ln A)
S2 = (S * F/1800)
S1,S2: Length of incomplete theads, mm
S : Spindle rotation, rpm
F : Pitch, mm
A : Thread tolerance
Relation ship between A and (-1 - Ln A) is as follows:
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