Heidenhain CNC Pilot 4290 Bedienungsanleitung PDF herunterladen (Seite 152)

4 DIN PLUS140

Thread cycle G31

G31 machine simple threads, successions of threads and multi-start

threads with G24, G34 or G37 Geo.

External or internal threads are detected by the tool definition. The

individual cuts are calculated from the thread depth, maximum

approach ”I” and type of approach ” V.”

Parameters

NS: Block number (reference to basic element G1 Geo for

successions of threads: block number of the first basic block)

I: Maximum approach - maximum infeed distance

B, P: Starting length, overrun length – no input: Length is calculated

from adjacent undercuts or recesses. Undercut/recess does not

exist: ”thread starting length, thread runout length” from

machining parameter 7.

D: Cutting direction (reference: Defined direction for basic element)

– default: 0;

■ D=0: Same direction

■ D=1: Opposite direction

V: Type of feed – default: 0;

■ V=0: Constant cutting cross section for all cuts

■ V=1: Constant infeed

■ V=2: With distribution of remaining cut – first infeed =

”remainder” of the thread depth/cutting depth division The last

cut is divided into 1/2, 1/4, 1/8 and 1/8 cut.

■ V=3: Infeed is calculated from the pitch and the spindle speed

H: Type of offset (infeed for smoothing the thread flank) – default: 0

■ H=0: No offset

■ H=1: Offset from left

■ H=2: Offset from right

■ H=3: Offset alternately right/left

Q: Number of air cuts after the last cut (for reducing the cutting

pressure in the thread base) – default: 0

C: Starting angle (thread start is defined with respect to rotationally

nonsymmetric contour elements) – default: 0

4.8 Thread Cycles

The slide requires a run-in distance to accelerate to the programmed

feed rate before starting the actual thread and a run-out distance

(overrun) at the end of the thread to decelerate again.

If the run-in/run-out length is too short, the thread may not attain the

expected quality. In this case, the CNC PILOT displays a warning.

Starting length: BA > 0.75 * (F*S)² / a + 0.15

4.8 Thread Cycles

Runout length: BE > 0.75 * (F*S)² / e + 0.15

BA: Minimum starting length

BE: Minimum runout length

F: Thread pitch in mm/revolution

S: Spindle speed in revolutions/seconds

a, e: Acceleration in mm/s²

(see ”Acceleration at block start/block end” in

machine parameter 1105, ...)

■ ”Feed rate stop” becomes effective at

the end of a thread cut.

■ Feed rate override is not in effect.

■ Do not use spindle override if the look-

ahead is switched off!

Cycle run

1 Calculate the cut segmentation.

2 Approach the ”internal starting point” at rapid tra-

verse on a diagonal path, which is calculated from

”Slope length B” and the safety clearance.

3 Execute a thread cut.

4 Return at rapid traverse and approach for next

pass.

5 Repeat 3 to.4 until the complete thread has been cut.

6 Execute idle cuts.

7 Return to ”internal starting point.”

For multiple threads, the same rate of cut is used for

each thread turn, before the next infeed motion is

executed.

Danger of collision!

An excessive overrun length P might cause a collision. The

overrun length can be checked during the simulation.

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