When using different specifications of the tool or tool wear, tool length compensation command can be used to compensate for changes in tool size without having to re-adjust or re-set tool. The following figure shows the offset of the different tool lengths. Fig. Different tool length offsets 1 programming format For the FANUC system, the tool length compensation command is G43, G44, G49, G43 is the tool length positive compensation; G44 is the tool length negative compensation; G49 is the undo tool length compensation command. 1) Established programming format for tool length compensation: Z__ is the programmed value and H is the register number of the length compensation value. The offset amount corresponds to the offset number and is preset in the offset memory by the CRT/MDI operation panel. When G43 and G44 instructions are used, the coordinates of the end point of Z-axis movement specified in the program must be calculated with the offset in the register specified by H (or D), regardless of whether the absolute size or the incremental size is programmed. G43 When adding together, G44 is subtracted, and then the result of the operation is processed as the coordinates of the end point. G43 and G44 are modal codes. When G43 is executed: Z actual value = Z command value + (H × ×) When G44 is executed: Z actual value = Z command value - (H × ×) Where: H×× refers to the tool length offset numbered in the xxx register. 2) Programming format for tool length compensation cancellation: G00(G01)G49 Z_ Or G00(G01)G43/G44Z_H00 2 Precautions 1 Tool length compensation can only be established when the movement command is issued. 2 Some CNC systems, such as FAGOR 8055M, use G43 to activate tool length compensation (addition/subtraction depends on the positive and negative offsets in the register); G44 cancels tool length compensation.
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Tool length compensation function