This pure dry goods explains three contents:
1. What is a variable pitch thread.
2. G code for variable pitch thread
3. Macro program of variable pitch thread
1. What is a variable pitch thread
The so-called variable pitch thread means that the pitch is not fixed, but gradually changes along the axis.
Variable pitch threads often have two forms:
1. Constant pitch thread with variable pitch, (as shown in the figure below):
That is: the width of the tooth does not change, the groove gradually changes
2. Equal groove width variable pitch thread (as shown in the figure below):
That is: the groove width does not change, the tooth width gradually changes
2. G code for machining variable pitch thread (fanuc)
G34 X__ Z__ F__K__
1. F is the initial pitch of the processed variable pitch thread.
2. K value is the increment or decrement of the pitch when the spindle rotates one circle.
If K is positive, then the pitch is increasing, and K is negative, that is, decreasing.
For example: machining a thread with equal groove width and variable pitch on a workpiece with a diameter of D50;
Starting pitch: F3.25;
When the spindle rotates once, the pitch increases by 0.5mm
The procedure is as follows
%
O0001 (sosweetmum)
T0101
S500 M03
G0X47 Z20
G34 Z-100 F3.25 K0.5 (first radial cut)
G0X60.
Z20.
X44.8
G34 Z-100 F3.25 K0.5 (2nd radial cut)
G0X60.
Z20.
X44.
G34 Z-100 F3.25 K0.5 (3rd radial cut)
G0X60.
Z20.
M01
M30
%
Note: The above procedure is to use the forming knife and the layered car, and the calculation is based on 3 knifes for reference.
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Actually, the equal area cutting method can be used, or the thread with large pitch can be written by alternate borrowing method; how to use the macro program to write?
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