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By radial position I must assume you mean the horizontal angle of holder around the tool post. I assume this because "radial position", strictly speaking, would be the distance from a center point and that is trivial to hold constant.
Anyway, the horizontal angle of the holder is very well controlled by a generous flat on the tool post and a matching, "D" shaped hole in the tool holder. I have found this to be far superior to the common use of a key on other QC tool posts that are based on a round post. In use I have found the repeat-ability of the position of the tool to be well better than 0.001" in all three dimensions, no matter what set of coordinates that you use to measure it (Cartesian or Polar). Unlike a key which will become less accurate as it wears, this "D" design of the post provides a self compensation for any long term wear so it should be equally repeat-able after years of use. When the holder is tightened on the post, it comes into intimate, 360 degree contact with it every time it is mounted: there are no gaps. This is also why it is extremely sturdy: there is just no where the holder can move to. It is locked solidly on the post as if the two were one piece of metal. I believe it is THE sturdiest QC tool holder system of them all. Far better than any of the dovetail designs or any others.
Originally Posted by old_toolmaker
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