6. Interpolation Functions
6.7 Thread Cutting
60
6.7.2 Inch Thread Cutting; G33
Function and purpose
If the number of ridges per inch in the long axis direction is assigned in the G33 command, the feed
of the tool synchronized with the spindle rotation will be controlled, which means that constant-lead
straight thread-cutting and tapered thread-cutting can be performed.
Command format
G33 Z__ E__ Q__ ;
Z
: Thread cutting direction axis address (X, Y, Z,
α
) and thread length
E
: Number of ridges per inch in direction of long axis (axis which moves
most) (decimal point command can also be assigned)
Q
: Thread cutting start shift angle, 0 to 360
°
.
Detailed description
(1) The number of ridges in the long axis direction is assigned as the number of ridges per inch.
(2) The E code is also used to assign the precision lead length, and whether the ridge number of
precision lead length is to be designated can be selected by parameter setting. (The number of
ridges is designated by setting the parameter "#1229 set01/bit1" to 0.)
(3) The E command value should be set within the lead value range when the lead is converted.
(4) The other matters are the same as uniform lead thread cutting.