Fluting is an operation that is so seldom required that it does not warrant buying special equipment for the purpose. So when I needed to flute some short columns, I made this fluting fixture from a drywall-trimming router, hardwood scraps and Plexiglas. The construction details shown in the sketch can easily be modified for your particular needs.
Harry J. Gurney, Taunton, Mass.
Fine Woodworking Magazine, December 1993 No. 103