下面是软件帮助的原文：
1. Tool Tip
The system draws the toolpath to the center of the tool tip radius. The X and Z-axis values are output to the theoretical tool tip if the system is able to calculate a touch-off point in both axes. X or Z-axis values are output to the center of the tool tip radius when the software is not able to calculate the touch-off point in that particular axis.
If the tool is machining parallel to the Z-axis, the X values are output to blueprint dimensions. If the tool is machining parallel to the X-axis, the Z values are output to blueprint dimensions. So, the theoretical tool tip only aligns with blueprint dimensions on faces and diameters.
When the tool is machining at an angle, the X and Z-axis values will not match the blueprint dimensions. This is because the theoretical tool tip is not always a blueprint dimension. So, in order for the system to get the surface of the tool in position to cut the part, the theoretical tool tip is calculated closer to the part, and in some cases inside the part.
Most Lathe Posts output X and Z values to the theoretical tool tip. Posts can be modified to output X and Z values to the center of the tool tip radius.作者: rockyping 时间: 2012-5-26 09:55
补充一点，我为什么选择刀具中心输出。主要是为了手工更改程序时，方便计算。
你ㄉ第一項因該是手寫ㄉ吧
