Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 403)

Letter Format Parameters
Chapter 17
17-5
The E-word letter format parameter is covered in E: # THRDS/INCH
Word Format on page 17-5.
Function
This parameter is used for lathe controls and grinder applications only. It
corresponds to the E-word that is used to program the thread lead in one of
these threading methods:
G-Code System
Lathe Grinder
A B C Surface Cylindrical Description
G32 G32 G33 G33 G33 Constant lead thread-cutting mode
G33 G33 G34 G34 G34 Variable lead thread-cutting mode
G92 G78 G21 — — Single Pass Threading Cycle
G76 G76 G78 — — Multi-Pass Threading Cycle
E-words correspond to the thread lead (in number of threads per inch)
along the axis with the largest programmed distance to travel to make the
thread cut.
This parameter specifies the maximum number of digits that are permitted
to the left and to the right of the decimal point in the E-word format.
Parameter Parameter
Number
E: #THRDS/INCH Word Format [464]
Range
Selection Result Selection Result
(a) 3.4 threads per inch (g) 2.4 threads per inch
(b) 3.5 threads per inch (h) 2.5 threads per inch
(c) 4.3 threads per inch (i) 2.6 threads per inch
(d) 4.4 threads per inch (j) 3.3 threads per inch
(e) 5.3 threads per inch (k) 4.2 threads per inch
(f) 2.3 threads per inch (l) 5.2 threads per inch
17.4
E-Word Format
17.5
E: # THRDS/INCH Word
Format