Machines With Hirth-Coupled Axes; Example Calculation Of Measuring Positions For An A Axis - HEIDENHAIN ITNC 530 - CYCLE PROGRAMMING User Manual

Machines with Hirth-coupled axes

Danger of collision!
In order to be positioned, the axis must move out of the
Hirth coupling. So remember to leave a large enough
safety clearance to prevent any risk of collision between
the touch probe and calibration sphere. Also ensure that
there is enough space to reach the safety clearance
(software limit switch).
Define a retraction height Q408 greater than 0 if software
option 2 (M128, FUNCTION TCPM) is not available.
If necessary, the TNC rounds the calculated measuring
positions so that they fit into the Hirth grid (depending on
the start angle, end angle and number of measuring
points).
Depending on the machine configuration, the TNC cannot
position the rotary axes automatically. If this is the case,
you need a special M function from the machine
manufacturer enabling the TNC to move the rotary axes.
The machine manufacturer must have entered the
number of the M function in machine parameter MP6602
for this purpose.
The measuring positions are calculated from the start angle, end angle
and number of measurements for the respective axis and from the
Hirth grid.

Example calculation of measuring positions for an A axis:

Start angle Q411 = -30
End angle Q412 = +90
Number of measuring points Q414 = 4
Hirth grid = 3°
Calculated stepping angle = ( Q412 - Q411 ) / ( Q414 -1 )
Calculated stepping angle = = ( 90 - -30 ) / ( 4 - 1 ) = 120 / 3 = 40
Measuring position 1 = Q411 + 0 * stepping angle = -30° --> -30°
Measuring position 2 = Q411 + 1 * stepping angle = +10° --> 9°
Measuring position 3 = Q411 + 2 * stepping angle = +50° --> 51°
Measuring position 4 = Q411 + 3 * stepping angle = +90° --> 90°
HEIDENHAIN iTNC 530 469