Heidenhain MANUALplus 4110 User Manual download pdf (Page 163)

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HEIDENHAIN MANUALplus 4110 163

4.6 Thread and Undercut Cycles

Angle of infeed (thread angle)

With some thread cycles, you can indicate the angle of infeed. The

figures to the right show the operating sequence of the MANUALplus

at an angle of infeed of –30° (figure at upper right) and an angle of

infeed of 0° (figure at center right).

Thread depth, proportioning of cuts

The thread depth is programmed for all thread cycles. MANUALplus

reduces the cutting depth with each cut (see figure at center right).

Handwheel superpositioning in threading cycles

As of software version 526 488-09, you can influence the current

thread cut via handwheel superpositioning in X and Z, and so optimize

the production of the thread. Handwheel superpositioning must be

supported by the machine manufacturer, and is activated via a switch

on the machine operating panel.

Handwheel superpositioning is restricted as follows:

 X direction (thread depth): Depends on the current cutting depth;

the starting and end points of the thread in X are not exceeded.

 Z direction: No more than one turn; the starting and end points of the

thread in Z are not exceeded.

Thread run-in / thread run-out

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

feed rate before starting the actual thread, and a run-out distance 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, MANUALplus displays a warning.

Calculation of chamfer (run-in) length:

BA > 0.75 * (F*S)² / a + 0.15

Calculation of run-out length:

BA > 0.75 * (F*S)² / e + 0.15

BA: Minimum run-in length

BE: Minimum run-out length

F: Thread pitch in mm/revolution

S: Speed in revolutions/second

a: Acceleration in mm/s² (see “Configuration parameters” on

page 435–1105 "Acceleration at start of block")

e: Acceleration in mm/s² (see “Configuration parameters” on

page 435 – 1105 "Acceleration at start of block")

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