To Mill or Not to Mill?
WEBMay 23, 2014 · Here are the results: Titleist SM4 TVD M 56 degree Chrome Fly Cut without Grooves or Milling. Titleist SM5 M 56 degree Raw Surface without Grooves/Milling Only. As you can see the club that had surface milling or roughness actually generated less spin 6009 RPM to 6229 RPM. While the difference between the two is negligible .