Learn how to use the G91 instructions and how to program them

CNC lathesMedium **G99 refers to: feed rate per revolution. After the numerical control system executes the G98 instruction, it determines that the unit of feed speed referred to by F is mm min (millimeter minutes).

For example, in the G98 G01 F200, the feed rate in the program section is 200mm min.

G99 per revolution: After the numerical control system executes the G99 instruction, it determines that the unit of feed speed cavity defense degree referred to by F is mm r (millimeter revolution).

For example, G99 G01, the feed rate in the program segment is.

Programming Format:1. Clockwise.

The instruction format of the circular interpolation instruction is Wu Mo:

g02 x(u) z(w) r f g02 x(u) z(w) i k f 2, the instruction format of the counterclockwise circular interpolation instruction is as follows:

G03 x(u) z(w) r f g03 x(u) z(w) i k f The above content refers to Encyclopedia - CNC Programming.

G99 and G98 are CNC lathes.

Two control modes for cutting feed. where g99 stands for feed per revolution and g98 stands for feed per minute.

**Format: G99F.

**Function: Given the cutting feed rate in millimeters, G99 is the mode G**.

When CNC executes G99 F, the product of F** value (mm revolution) and the current spindle speed (R min) is used as ** feed speed to control the actual cutting feed rate, and when the spindle speed changes, the actual cutting feed speed changes with it. With the G99 F, given the cutting feed per spindle of the spindle, a uniform cutting pattern can be formed on the surface of the workpiece. In G99 mode, the machine must be fitted with a spindle encoder.

The conversion formula between the feed per revolution and the minute feed per yard of Zhishan:

fm = fr x s。

Where: fm: feed per minute (mm min).

fr: Feed per revolution (mm r).

s: spindle delay speed (r min).

G98 is fed per minute and G99 is fed per revolution.

When programming on a machining center; g98, which indicates a return to the initial plane of the knife. corresponding g99; is to return to the r-plane of the knife.

For example; One section of the drilling program, G98

<> G91 command incremental position data input.

g91 indicates the displacement to be manipulated, while g90 indicates that the target point is in the coordinate system.

The coordinates in size, G90 and G91 apply to all axes, both of which are indeterminate to determine the location of the destination.

When the bitcode is different from the G90 G91 setting, the program segment can be set relative to the size using the absolute size AC IC. When entering absolute position data, the dimensions depend on the current coordinate system zero, g**.

It is the most widely used CNC programming language.

G92 is the workpieceCoordinate systemsetting,For example, if you have set the G54 coordinate system, you can set a certain position point (x1, y1, z1) of the G54 coordinate system as the origin of the coordinate system, and the command is G92 X1 Y1 Z1, and the program segments after G92 are programmed with (x1, y1, z1) as the zero point.

The format of the G92 Thread Cutting Cycle Instruction: G92 X(U Z(D R F.)

x, z - absolute coordinate value of the end point of the screw twist; u, w - the incremental coordinates of the end point of the processed thread relative to the beginning of the cycle; r-The difference between the radius of the starting point of the tapered thread cutting and the end point of the thread cutting. This value is positive and negative, when r is zero, it is a cylindrical thread cutting cycle, which can be omitted; f - thread lead, if it is a single wire thread, f is the pitch of the thread.

Several generations of Kaikong lathes.

Prepare function g**.

JB3208-83), G** (or G Instruction.

It is a process instruction that needs to be pre-specified before the interpolation operation of the CNC machine tool system and prepared for the interpolation operation, such as: the selection of coordinate planes, the designation of interpolation methods, the designation of fixed cycle functions such as hole machining, etc.

G** is composed of two digits followed by the address G, G00 G99 is commonly used, and some modern CNC machine tool systems have been extended to three digits. g**Divided into modalities by functional category.

**and non-modal**. a、c、d、……J, K and other 9 groups, the corresponding g** of the same group is called modal**, which means that once a regression segment g** (such as G17 in group C) in the group is specified, the function will be maintained until any other ** in the same group (such as G18 or G19) will be invalidated, otherwise it will continue to be valid.

Therefore, when programming a program segment, if you need to use the same g**, you can omit it, which can simplify the processing programming. Non-modal ** is only valid in this segment.

G90 is an absolute value programming instruction. Bishan.

Format: G90

Note: 1) When G90 is programmed, all subsequent programmed coordinate values are based on the programmed zero point.

2) After the system is powered on, the machine is in the G state.

n0010 g90 g92 x20 z90。

n0020 g01 x40 z80 f100。

n0030 g03 x60 z50 i0 k-10。

n0040 m02。

The G95 instruction is per revolution. The G95 instruction corresponds to the G94 feed per minute, the G95 feed per revolution is commonly used in CNC lathes, and the G94 feed per minute is commonly used in machining centers. G95 and G94 do not need to be programmed in the program, it is set in the setting screen of the machine tool, and there should be a lock.

CNC lathesIt 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 rotary and cylindrical and conical threads, and can be used for grooving, drilling, lead reaming, reaming and boring.

Features of the G95 directive

By inputting the corresponding instructions in the computer, the computer can work normally according to the workers' ideas. Then the corresponding instruction is the numerical control instruction, often called the instruction g, the numerical control instruction is input into the numerical control program, and the lathe will change the working state accordingly.

G95 is one of the numerical control instructions, the function of this instruction is to input the feed per revolution, that is, in each revolution of the lathe, the corresponding number of entries to the lathe, and G94, which means feed per minute. These are all commonly used instructions in NC.