Machinist Calculator 

Machinist Calculator has been developed to quickly solve common machine shop math problems such as trigonometry, speeds and feeds, bolt circles, and much more. Get your free demo now.
trigonometry trig machinist speeds feeds speeds bolt circle

Camalot 

Whether you are a small machine shop or have a Cad Cam System, for $29.95 this is a must have program. You can get in and solve your calculations and get right back to work. It is designed to be user friendly. There is clipboard support & trig calc.
trig oblique triangles right triangles cad cam machinist cnc