What does G92 mean in CNC?

Thread cutting cycle G92: In the FANUC CNC system, there are two processing instructions for CNC lathe thread cutting cycle machining: G92 straight cutting and G76 oblique cutting.

Due to the different feeding methods of cutting tools, these two processing methods are different, and their programming methods are also different, and the machining accuracy of the thread section after the workpiece is machined is also different.

Instruction description: G92 is the modal G instruction;

Cutting start: the starting position of the thread interpolation;

End of cut: the end position of the thread interpolation;

x: the absolute coordinate of the x-axis of the end point of cutting, unit: mm;

u: the difference between the absolute coordinates of the end point of cutting and the x-axis of the starting point, unit: mm;

z: the absolute coordinate of the z-axis of the end point of cutting, unit: mm;

w: the difference between the absolute coordinates of the end point of cutting and the z-axis of the starting point, unit: mm;

r: the difference between the absolute coordinate of the x-axis of the cutting start point and the end point of cutting (radius value), when the sign of r and u is inconsistent, r u 2 is required, unit: mm;

f Metric thread pitch, value range mm, f Command value is maintained after execution, input can be omitted;

i The number of teeth per inch of the inch of the inch of the

J: The amount of movement in the direction of the minor axis when the thread is withdrawn, the value range is 0 units: mm), without direction (according to the program.

The position of the starting point of the sequence automatically determines the direction of tail retreat), modal parameters, if the minor axis is the x-axis, then the value is specified for the radius,;

k: the length of the thread in the direction of the long axis when the tail is withdrawn, the value range is 0 unit: mm). Without direction, modal parameters, such as the long axis is the x-axis, the value is specified for the radius;

l: the number of heads of the long thread, the range of this value is: 1 99, modal parameter. (Defaults to a single-head thread when L is omitted).

The G92 command can complete the machining of one thread in multiple feeds, but it cannot realize the machining of two consecutive threads, nor can it process the end thread. The definition of the G92 command thread pitch is the same as that of G32, which refers to the displacement of the main shaft in one rotation of the long axis (the displacement of the x-axis is valued by radius).

The pitch of the taper thread refers to the displacement of the major axis of the spindle (the displacement of the x-axis is according to the radius value), and when the absolute value of the Z-axis coordinate difference between point b and point C is greater than the absolute value of the coordinate difference of the x-axis (radius value), the z-axis is the long axis; Conversely, the x-axis is the long axis.

G92 in CNC refers to: thread cutting cycle instruction.

Numerical control, which is the abbreviation of digital control, refers to the use of digital information for mechanical movement.

and a method of process control.

The role of this instruction is different for different systems.

It depends on your system.

For example, in FAUNC, the G92 can be used to machine threads (single cycle instruction) or to define a coordinate system.

The coordinates of the current tool tip point are x0y0z0a0

It is to set the relative coordinate value.

The problem is not clear and cannot be explained, and the G92 in the number of cars is a threaded instruction.

In CNC lathes, G99 refers to: Feed rate per revolution. It represents that in the settings of CNC model machining, the feed rate is programmed to control the cutting speed of the tool to the workpiece, that is, the speed at which the tool rotates with the spindle at high speed and cuts forward according to the preset toolpath.

In the CNC model machining settings, the feed rate is programmed to control the cutting speed of the tool on the workpiece, that is, the cutting speed when the tool rotates at high speed, and cuts forward according to the pre-set tool path.

There is no fixed value for spindle speed and feed rate, which is usually set by empirical value, and is mainly selected according to the tool and workpiece material. Increasing the feed rate can improve production efficiency.

During machining, the feed rate can also be adjusted manually via the adjustment switch on the machine control panel. The control panel of CNC machine tools is usually equipped with a spindle speed adjustment switch, which can adjust the spindle speed as a whole during the machining process. However, the maximum feed rate is limited by the stiffness of the equipment and the performance of the feed system.

The G92 instruction is used to turn the multi-head thread thread cutting cycle G92 is a simple thread cycle, the instruction can cut the cone thread and the cylindrical thread, and the cycle route is basically the same as the single shape fixed cycle mentioned above, but the feed behind F can be changed to the pitch value, and the instruction format is: **Format: G92 X(U) Z(W) R F J K L;

J and K are tail regressions, and L is the number of multi-threaded heads

1. When JK is omitted, the parameter value determines the tail length of the tail.

2. When J is omitted, the direction of the long axis is retracted according to K, and the direction of the short axis is determined by the parameters.

3. When k is omitted, j is equal to k.

4. When j is equal to 0 or both are equal to 0, there is no tailing.

5. When J is not equal to 0 or K is equal to 0, press J to equal K to detail.

6. When j is equal to 0 and k is not equal to 0, there is no tailing.

CNC lathe is one of the most widely used CNC machine tools. It is mainly used for the cutting of the inner and outer cylindrical surfaces of shaft parts or disc parts, the inner and outer conical surfaces of arbitrary taper angles, the internal and external curved surfaces of complex rotation, cylindrical and conical threads, and can be grooving, drilling, reaming, reaming and boring.

CNC machine tools are automatically processed on the processed parts according to the pre-programmed processing program. We compile the processing process route, process parameters, movement trajectory, displacement, cutting parameters and auxiliary functions of the parts into a processing program sheet in accordance with the instructions and program formats specified by the CNC machine tool, and then record the content of the program sheet on the control medium, and then input it into the CNC device of the CNC machine tool, so as to command the machine tool to process the parts.

The differences between the G90 and G91 directives are:

1. The programming mode is different: G90 is absolute incremental programming, and G91 is relative incremental programming.

2. Different coordinate input methods: G90 and G91 correspond to absolute position data input and incremental position data input respectively. where g90 represents the coordinate size of the target point in the coordinate system, and g91 represents the amount of displacement to be run.

The G90 G91 is suitable for all sitting-rock shafts.

3. The reference zero point is different: when G90 is programmed into the program, all the coordinate values of the subsequent programming are based on the programmed zero point. When G91 is programmed, all subsequent coordinate values are used as a starting point to calculate the programmed value of the motion.

In the next coordinate system, the previous point is always programmed as the starting point.

G90 and G91 are the two G**s used in CNC milling, which represent the working mode of absolute and incremental coordinates, respectively. The difference between them is below:

1.G90 (Absolute: When using the G-command, the machine interprets all the commands, such as moving to a specific position or line interpolation, as absolute.

This means that the coordinate values in the program are determined for the origin or reference point of the work-sitting system. The moves are positioned according to the absolute coordinates of the roam, regardless of whether there are other previous movement commands.

2.G91 (Incremental Mode): When using the G91 command, the machine will interpret all movement commands as incremental sitting.

This means that the coordinate value of the program represents the displacement relative to the position after the last time. Each move is based on the last position offset, not on absolute coordinates. When using g, you need to explicitly specify the relative displacement from the previous operation.

To sum up, G90 is the absolute coordinate programming book, and G91 is the range mode. In G90 mode, each seat is the absolute position relative to the origin of the workpiece coordinate system, while in the 91 mode, each seat is relative to the previous operation, according to the specific machining summation programming habits, you can choose the appropriate mode to write the CNC milling machine program.

G94 in CNC programming—single fixed shape cyclic machining end face and inclined end face cutting cycle instruction G94 instruction format:

g94 x（u）＿z（w）＿ f＿；

Note: where x, z—absolute value programming, is the end point of the cutting in the workpiece coordinate system of the coordinates; When the increment is programmed, it is the incremental coordinate value of the end of the cut relative to the beginning of the cycle, which is represented by you and w, and f—is the feed rate.

Advantages and disadvantages of CNC programming.

1. Advantages. It is mainly used for point processing (such as drilling, reaming) or the processing of parts with simple geometry (such as plane, square groove), with a small amount of calculation, a limited number of program sections, and intuitive and easy to realize programming.

2. Disadvantages. For parts with spatial free-form surfaces and complex cavities, the calculation of tool trajectory data is quite cumbersome, laborious, error-prone, difficult to proofread, and some even impossible to complete.

Absolute value programming g91 Increment value programming g92 thread cutting cycle g94 feed per minute g95 feed per revolution g96

Constant line speed control G97 constant line speed cancels.