Centrifugal air separator coil manufacturing tools and methods

A helical coil toolset comprising:

• a helically grooved mandrel with a helical groove having a semicircular profile sized to accept an outside circumference of a tube in a sliding fit, wherein the helical groove has a helix inside diameter that is less than twice a width of the helical groove;
• and
• an entry block with a guide channel and a mandrel channel, wherein the guide channel is sized to fit the outside circumference of the tube and to permit the tube to slide through, the guide channel has an exit that connects with the mandrel channel, the mandrel channel is configured to receive the helically grooved mandrel, the mandrel channel has a helical tube-contacting surface that extends into the helical groove of the helically grooved mandrel to engage the tube when the helically grooved mandrel is received in the mandrel channel and when the tube is positioned within the helical groove, and the guide channel is configured to direct the tube into the helical groove of the helically grooved mandrel.