Section:
Page
PROGRAMMING16
Chapter: 6
PATH CONTROL
6.5.4 SYNCHRONIZATION (G33)
With function G33 it is possible to synchronize the X axis with an external device.
When this feature is used the machine cannot use a Y axis, with the A2 feedback connector
being used as feedback input for the external device.
Typical applications for this feature are: Lathe style threading, paper feeder synchronized
with the rotation of the roller, etc.
Its programming format is: G33 X K
Where X End coordinate
K Synchronism pitch or displacement of the X axis per turn of the external
device.
Attention:
The programmed feedrate cannot be overridden while function G33 is
active.
G33 is modal and incompatible with G00, G01, G02, G03, G34 and G75.
On power-up, after executing an M30 or after an Emergency or Reset, the
CNC assumes G00.
Example of threading
The machine must have a spindle encoder.
Take the X axis feedback to connector A1 and the spindle feedback to connector A2
To make in only one pass the cylindrical thread 2 mm in depth and with 5 mm pitch,
as shown in the figure, program as follows:
G33 X40 K5 in absolute coordinates or G33 X-140 K5 in incremental coordinates.
The value in X indicates the final positioning coordinate
The value of K indicates the positioning of the X axis per spindle turn. As in this case
a 5 mm thread pitch is required K5 should be programmed.
The proper programming is as follows:
G1.90 X180 ......... ; Movement in operating feedrate to the starting point
G33 X40 K5 .... ; Threading
M30 .................. ; End of program
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