Frank Ford, a luthier of some renown for Gryphon Stringed Instruments has a section of his website Frets.com devoted to home shop machining tips and projects. Many of the projects are related to his production of replacement parts for various guitars and other stringed instruments, while others are just general machining projects. His projects are far from run of the mill, including such things as making rope knurls, a 19mm tap, or his latest, knurling 3′ of drill rod. The man is a master machinist and has the great ability to document his projects clearly with great photographs. It’s well worth procrastinating for a couple of hours and checking out all of his work, especially if you do any instrument repair.