The toolholder, the spindle rigidity, the diameter of the endmill, the length of the endmill, the feedrate, these factors all contribute to how much the tool leans in the cut. Endmills will bend back in heavy cutting and this pushes the corners of the flutes down into the work to some degree. So a small amount should be left on the floor of the pocket for a light finish pass wherein this effect is minimized and you get the true accuracy out of the tool height setting.
Also, the method used to set the tool length offset can have an effect on how accurately all the tools are set relative to one another.
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |