I made this tap and drill index a short while ago, and I have found it very useful. It holds all of the drills and taps needed for #4-40 through 1/4"-32 for both 50% and 75% threads, as well as drills for close fit and loose fit holes (see picture). This index makes it very simple to quickly access the right drill and tap for most of the tapping I do.
It actually took me longer to create the template for the index than to make the index itself. The template includes labels for all screws sizes, for Taper, Bottom, and Plug taps, and includes drills numbers and decimal sizes.
You'll notice that I have stuck cotton swabs in some of the index holes - these are holes for drills or taps I don't have (yet); I make sure there are no empty holes to avoid replacing a drill or tap in the wrong hole.
The template serves as a guide for drilling, as well as providing labels for the finished index; the template and other details can be found at the link below, which also includes a guide for choosing drill sizes for drilling the index.
https://sites.google.com/site/lagadoacademy/machining---lathes-mills-etc/build---drill-and-tap-index
It actually took me longer to create the template for the index than to make the index itself. The template includes labels for all screws sizes, for Taper, Bottom, and Plug taps, and includes drills numbers and decimal sizes.
You'll notice that I have stuck cotton swabs in some of the index holes - these are holes for drills or taps I don't have (yet); I make sure there are no empty holes to avoid replacing a drill or tap in the wrong hole.
The template serves as a guide for drilling, as well as providing labels for the finished index; the template and other details can be found at the link below, which also includes a guide for choosing drill sizes for drilling the index.
https://sites.google.com/site/lagadoacademy/machining---lathes-mills-etc/build---drill-and-tap-index