Contour Velocity At Corners - HEIDENHAIN iTNC 530 HSCI Technical Manual

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6.10.2 Contour velocity at corners

To comply with a defined tolerance, the iTNC can reduce the tool velocity

before machining corners, line-to-arc transitions and arc-to-arc transitions. The

control can react to a potential violation velocity tolerance up to 256 blocks in

advance. This feature is known as "look-ahead":

Define the permissible tolerance for contour transitions in MP1096.x for

movements at the machining feed rate and at rapid traverse. The larger the

tolerance, the greater the tool velocity.

The user can overwrite this tolerance with Cycle 32 "Tolerance."

Jerk limitation (see "Interpolator" on page 814) and nominal-position-value

filters enable the iTNC to machine 3-D surfaces at high speed. Prerequisite:

The contour must be described with short line segments.

To ensure that cutter-compensated outside corners remain exact, a spline

must be inserted into the cutter midpoint path instead of a transitional arc. The

longer path of the spline (compared to the circle) results in an increased

machining time. A spline also has the advantage of reducing the jerk:

Enter bit 10 = 1 in MP7680.

FN17: SYSWRITE ID1020 NR1 = <value> can be used from the NC program

to activate machine parameter subfiles for various machining operations.

Tolerance for contour transitions at corners

0: No nominal position value filter

0.001 to 3.000 [mm]: Permissible tolerance at contour

With machining feed rate

With rapid traverse

Machine parameter with multiple function

Bit 10 – Cutter-radius-compensated outside corners:

0: Insertion of a circular arc

1: Insertion of a spline curve

Proposed input value: %xx1xxxxxxxxxx

Bit 11 – Reserved

HEIDENHAIN Technical Manual iTNC 530 HSCI