Sites with helpful machinist charts...

[Nelson]

http://www.melcut.com/ti_melcut/MelcutCat_32.pdf

http://www.tapdie.com/html/tap__tapping_speeds__feeds_lub.html

Please feel free to add others...

Nelson

 

[joegamma1]

I'm not sure this really applies to this thread or not but I was out in the garage the other night and had to look up a drill bit size for a certain tap and referred to my "garage buddy" app on my Droid. Had what I needed.
Would be a great app for others with a smart phone IMHO.