This rotary cross slide had been used as a positioning device on what I'm guessing was a shop-built end mill sharpener.  There were two, this one and another with holes drilled/tapped on the table.  There were also some adjustable stops added to limit the amount of travel on both linear and rotation.  These stops can be easily removed if not needed.  The table is about 7 1/2" diameter.  Total height is under 5".   Ask questions if you need to.