1. Calculate new Zero Point on Trunnions with Macro

2. Programcode G254 A-30. B60. S54. T59. (X0.) (Y0.) (Z0.)
G254  G – Function
A-30.  A – Axis in Position -30°
B60.  B – Axis in Position 60°
S54.  Origin Zero Point
T59.  Work offset
X0.  X Displacement
Y0.  Y Displacement
Z0.  Z Displacement

3. Offset – Centerline + Offset G54
G154 P99 Z-zero is centerline of A-axis rotation. To set G54 Z zero, measure the distance from face of the fixture to centerline of A-axis rotation. To do this, rotate to G154 P99 A+90. and pick-up face of fixture with an edge finder and note the Y-axis position. Rotate to G54 A-90. and pick-up face of fixture again. The difference between the two readings, divided by two, is the distance from face of the fixture to centerline of A-axis rotation.
Enter the distance from face of the fixture to centerline of A-axis rotation in G154 P99 Z-axis offset. This value will be a negative on Trunnion units.
G54 is the Origin Point on the Part. There can be a Edge or a hole.
Set X Y and Z as you do this without Trunnion

4. Overview The Control is reading G254 A-30. B60. S54. T59.
First the Z-Axis travel to G00 G53 Z0 (change this in the Macro)
The values from Origin Zero Point G54. ( S54) will be calculate with the Rotation Point ( G154 P99) and with the values in A and B-Axis.
The calculated values become in the workoffset G59. (T59)
The control activates position itself the work zero and the A- and B axis newly. (A-30. B60.)

5. Note
The Tool Change Position in Z-Axis can change in the Macro G00 G53 Z0. It is the highest Point in Z.
Check the Trunnion of correct rotation
Check the Parameter

6. Demo Program O04717 (DATUM 05-02-10 12:19 ) (ERSTELLT MIT MASTERCAM)
G00 G17 G40 G94 G80 G90
T4 M06
S8000 M03
G17
G90 G55
M11
M13
G254 A-45. B-180. S55 T59 X-80. Y-80. Z0.
M10
M12
G00 X7.5 Y2.121
G00 G43 H04 Z10.
G00 Z-0.121
G01 Z F1000.
G01 X0. F2000.
G01 X-80.
G01 X-87.5
G00 Z10.
G254 A0. B0. S55 T59 X0. Y0. Z0.
M30 %