On 8 Apr 2012, at 05:12, charles green <xxzzb...@yahoo.com> wrote:

> anyone know if there is any logic to the variety of conical mating surfaces 
> used in machine tools?
> 

http://www.tools-n-gizmos.com/specs/Tapers.html

Is a useful list. The spindle-nose tapers are all the same, but with different 
flange and drawbar arrangements. 

I can only assume that the Morse tapers work out to have round-number inch 
dimensions. (note that the gauge diameter is not the big end)


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