Position offsets

Offset management in PCS – WCS transformations

If an offset needs to be activated between the programmed coordinates PCS and the actual physical axis positions ACS, you have a number of options as user.

CNC-programmed offsets (G54, G92, etc.) are taken into consideration between PCS and WCS.

WCS – ACS

If the kinematics of a machine require offsets on the axis coordinate system, this is taken into consideration in the transformation.

Programing Example

Use of axis-specific offsets in kinematic transformation

N010 G54             ; activate zero point offsets at ACS=PCS level

N020 G0 X0 Y0 Z0 B0 C0 ; move to zero at PCS level

; …

N090 G53            ; deactivate PCS offsets

; …

N120 V.G.KIN[500].PARAM[40] = <x_offset in [0.1 µm]>

N130 V.G.KIN[500].PARAM[43] = <b_offset in [0.0001 degree]>

N140 V.G.KIN[500].PARAM[44] = <c_offset> in [0.0001 degree]

N200 #KIN ID[500]    ; select kinematic type

N210 #TRAFO ON      ; ACS offsets are considered inside transformation

N220 G01 X100 C90

;…

N240 G92 X400 C180 ; activate additional offset at PCS level

N250 G01 X12 C0

…

N340 G56 ; activate additional offset at PCS level

N350 G01 X2 C50

;…

N999 M30

Access to kinematic parameters

If kinematic parameters are initialised in the CNC program, they are forwarded to the forward/backward algorithms as transformation input parameters (the parameter index used is transformation-specific).