Sometimes buying a pricey tool ... Dremel with a router base and round-over bit to do the job. Conversely, it's much less simple to disassemble the wood piece and drag it to the shop where you use ...

The wood frame is constructed to move freely front to back and left to right. To control the height of the cutting tool, in this case a Dremel, the frame pivots up and down and the X-axis rail.