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Because your end product is always measured in diameters.

Nobody asks for a shaft with a R20.00 H7 diameter and tolerance. They just want a 40.00mm shaft, toleranced or not. 

However, It's just a parameter setting in your machine, if you like, you can easily change it to radius programming. Heck, you can even make an offset on the outside of the material and then make cuts and count how much you've removed in order to calculate the current diameter, or radius. 

If you want you try to use you lathe in radius mode, you have to double check that your surface speed is still correct, I can't promise that it compensates for that. 

On 06/09/2014 at 10:39 AM, amjad said:

why in cnc turning programme shaft diameter is used instead of radius

 

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