This elegant 2-1/4" dentil moulding measures 2.250" wide by .750" thickness. The profile is comprised of a 1" wide raised fillet on top, connected to a 1/2" rabbet on one side for the crown to seat into, joined to a small radius arc that is attached to a fillet with a cove on the opposite side.
Here is just one way to manufacture this fine dentil moulding, first find wide of boards you can safely cross cut on a table saw, plane to a thickness of 13/16". Using a sled jig on the table saw, mill each cut 1" apart, crosscut the grooves no deeper than 5/16" + .020" (this is what the last spindle on the moulder would cut), you don't want any exposed gaps once the crown is installed into the rabbeted area. Simply rip the board to 2-1/2" widths, this is why you want a wide board to start, this dimension will allow 1/8" to be milled from each vertical cutter head.
Place rubber rollers on the moulder feed system, remove (.000") off the first bottom spindle, mill 1/8" from each side, mill about .040" from the top cutter head, it will clean up any chipping left from the table saw when cross cutting, the last bottom mills .020". This is an expensive moulding to manufacture so make sure everything is correct before a lot of lineal footage is milled.
For knife quoting purposes use the calculator below, we have added only the important dimensions, just determine the profiles you need. A brief detailed explanation on how to use the calculator is located here.
Width = 2.250" / Depth of Cut = .650" (top knives).
Thickness = .750" / Depth of Cut = .500" (left cutters).
Note: If you’re experiencing trouble printing to Full Scale, Go to File, Print Preview. Change the “Shrink to Fit” option to 100%