Describing The Mechanical Offset; Compensation Of Mechanical Offset When Exchanging The Spindle Head - HEIDENHAIN TNC 426 PB/M Technical Manual

Table of Contents

6.5.2 Describing the Mechanical Offset

Describing the

mechanical offset

Determine the mechanical offset of the axes in the home position. For swivel

heads, the starting point is the tool datum; for tilting tables, the starting point

is the center of rotation of the first axis (as seen from the workpiece):

Only for tilting tables: Define the center of rotation of the first tilting axis with

respect to the machine datum.

Determine in sequence the linear or rotary offset to the next tilting axis until

you reach a point that is not separated from the machine frame by any free

tilting axis.

In MP7510.x, enter the sequence of the transformed axes, in MP7520.x the

type of axis and dimensional data, and in MP7530.x enter the value of the

offset. See the examples on the following pages.

In MP7550.x, enter the home position of the tilting device in the machine

coordinate system.

If a rotation has been entered, it must be canceled again in an additional

transformation.

With MP7500 bit 4 = 0, the mechanical offset is only compensated when

M128, M114 or "tilted working plane" is called.

With MP7500 bit 4 = 1 you must compensate the mechanical offset by

means of a PLC datum shift. This allows the mechanical offset to be

compensated during all tilting axis movements, and not just when M128,

M114 or "tilted working plane" is called. You can also use functions M144

or M145; (See "Miscellaneous function M144/M145" on page 6 – 84).

HEIDENHAIN Technical Manual TNC 426, TNC 430