I made use of the CNC Router in Doherty today. I cut  molds for two carbon fiber panels to be used as driver close-outs in the Formula SAE race car. The foam was a 6lb/ft^3 density polyisocyanurate (polyiso for short). The foam has similar properties to polyurethane foam, such as closed cell (very tiny air bubbles), and importantly is not adversely affected by most solvents and can be coated with a wide variety of sealants, paints, and primers. These pieces were cut using a 1/2″ ball nose endmill for the horizontal roughing passes, then a 1/4″ ball nose endmill for the parallel finishing pass. Below are some in process and finished CNC shots. I’ll follow up with primered, sanded/polished, and carbon parts at a later date.