Siemens SINUMERIK 840DE SL - 2.4.2 Selecting the TRC (G41;G42)

Detailed Description
2.4 Tool: Tool radius compensation 2D (TRC)
Tool Compensation (W1)
2-40 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
TRC on the plane
TRC is active on the current plane (G17 to G19) for the following types of interpolation:
• Linear interpolation
... G0,G1
• Circular interpolation
... G2, G3, CIP
• Helical interpolation
... G2,G3
• Spline interpolation
... ASPLINE, BSPLINE, CSPLINE
• Polynomial interpolation
... POLY
2.4.2 Selecting the TRC (G41/G42)
Direction of compensation
TRC calculates a path, which is equidistant to the programmed contour. Compensation can
be performed on the left- or right-hand side of the programmed contour in the direction of
motion.
• G41
... TRC on the left-hand side of the contour in the direction of motion
• G42
... TRC on the right-hand side of the contour in the direction of motion
• G40
... Deselection of TRC
Intermediate blocks
In general, only program blocks with positions on geometry axes in the current plane are
programmed when TRC is active. However, dummy blocks can still also be programmed
with active TRC. Dummy blocks are program blocks, which do not contain any positions on a
geometry axis in the current plane:
• Positions on the infeed axis
• Auxiliary functions,
• etc.
The max. number of dummy blocks can be predefined in machine data:
MD20250 $MC_CUTCOM_MAXNUM_DUMMY_BLOCKS
(number of blocks with no traversing movements with TRC).