Variable pitch threads (G34). Fagor CNC 8055 para otras aplicaciones, CNC 8055 para fresadoras, CNC 8055 for milling machines, CNC 8055 for other applications

6.

Programming manual

6.13

Variable pitch threads (G34)

To make variable-pitch threads, the spindle of the machine must have a rotary encoder.

Although this threading is often done along the entire length of an axis, the CNC enables threading to be done interpolating more than one axis at a time.

Programming format:

G34 X.....C L Q K

X...C ±5.5

L 5.5

Q ±3.5

K ±5.5

End point of the thread

Thread pitch

Optional. It indicates the spindle angular position (±359.9999) of the thread's starting point. If not programmed, a value of "0" is assumed.

Thread pitch increase or decrease per spindle turn.

Some points to consider:

Whenever G34 is executed and before making the thread, the CNC references the spindle (home search) and positions the spindle at the angular position indicated by parameter Q.

Parameter "Q" is available when spindle machine parameter "M19TYPE" has been set to "1".

When working in round corner mode (G05), it is possible to blend different threads in the same part.

While function G34 is active, neither the programmed feedrate "F" nor the programmed Spindle speed "S" can be varied. They will both be set to 100%.

Function G34 is modal and incompatible with G00, G01, G02, G03, G33 and G75.

On power-up, after executing M02, M30 or after EMERGENCY or RESET, the CNC assumes code

G00 or G01, depending on how general machine parameter "IMOVE" has been set.

Blending a fixed-pitch thread (G33) with a variable-pitch thread (G34).

The starting thread pitch (L) of the G34 must coincide with the thread pitch of the G33.

The pitch increase in the first turn of the spindle in variable pitch will be half and increment (K/2) and in the rest of the turns it will be the full increment K.

Blending a variable-pitch thread (G34) with a fixed-pitch thread.

It is used to finish a variable-pitch thread (G34) with a portion of the thread keeping the final pitch of the previous thread.

Since it is very complicated to calculate the final thread pitch, the fixed-pitch thread is not programmed with G33 but with G34 ... L0 K0. The CNC calculates the pitch.

Blending two variable-pitch threads (G34).

Two variable-pitch threads (G34) cannot be blended together.

CNC 8055

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