I am putting together plan to build a 4th axis for my CNC router. One things that has been a confusing is lathe chucks and their mounts. Wood lathes typically have a treaded interface such as 1" 8TPI type mount. I understand this stuff. Many of the headstocks I see for sale have more of a milling machine type interface were the chuck mounts to the plate of the headstock spindle. As as an example see referred to as type K12. No place can I find more details about what the a K12 interface is or these type of mounts. Anyone know of guide to this type of information?

Thanks.

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