03-26-2015, 03:39 PM
I got more of those "little extra" things too, if anyone else wants one. It's about a buck to send one, a Valenite Tap Calculator. It's an old fashioned "slide rule" style glossy cardboard thing that allows you to select a given tap size, then shows the right drill for it. It covers UN and metric taps, gives expected percentage of full thread. It even has the drill sizes for form taps.
On the flipside it has the cutting speed for taps. Nice tool.
On the flipside it has the cutting speed for taps. Nice tool.