Marking, drilling, and cutting the rose
Then I drew 32 straight lines (diameters), evenly spread running from one side of the circle to the other side, passing through the center point.
I began by drawing two diameters at right angles to one another. Then I drew another two in the middle of those, making 4 diameter lines.
Then I drew another 4 in the middle of those, making 8 evenly spaced diameter lines.
Then I drew another 8 in the middle of those, making 16 evenly spaced diameter lines.
Then I drew another 16 in the middle of those, making 32 evenly spaced diameter lines. And that was enough. That meant that there were 64 evenly spaced lines (radii) running from the center to the edge of the circle (circumference).
The circle with the 9" (225mm) radius and the circle with the 6 13/16" (169mm) radius marked the drilling points where they crossed the radius lines.At those points I made an indent in the MDF board with a center punch, giving a starting guide for the drill bit.
I used a 3/8" (10mm) drill bit for the 64 outer holes and a 5/16" (8mm) drill bit for the 64 inner (closest to the center) holes.
Each pair of holes along the radius lines marked the length and width of a slot (yet to be cut).
I joined the outside edges of each pair of holes with a couple of straight lines.
I cut along those lines with a jig-saw creating a slot.
And so on and so on until all 64 slots were cut.