I decided to build the “Final Sled” rather than build the temporary sled first as that would take near twice the time. I am a reasonable wood worker and saw no problem build the “Final Sled” first. I made a 18" circle out of a 3/4 inch plywood. I went ahead and drilled the center hold at 1.5" diameter. Then as you do with the “Final Sled” I downloaded the files to CNC the “Final Sled” and then opened up the file: New Sled With Tool Paths.svg in Adobe Illustrator. I printed the drawing to full scale and taped the pages together to get a 1:1 template. I now had a clean template to locate all the additional holes in the sled.
I quickly discovered that the center hole in my “Final Sled” template is 3" in diameter whereas the Temporary Sled instructions tells you to drill a 1.5" center hole.
Does anyone know why the hole sizes are different? Or can I leave the center hole at 1.5" as making it 3" now would be difficult as I have now lost the enter point for my hole saw?