The STP conversion tool is a free application for making quick speed, torque and power computations. Enter two of the three values and the tool produces the third. The calculator can also be set to convert speed to rpm or rad/s. It can also do torque/oz-inch, lb-inch, lb-ft, N-cm or N-m conversions, and power to watts or HP conversions. It can be downloaded for free at the company's website.
A make-your-own Star Wars Sith Lightsaber hilt is heftier and better-looking than most others out there, according to its maker, Sean Charlesworth. You can 3D print it from free source files, and there's even a hardware kit available -- not free -- so you can build one just in time for Halloween.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies.
You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived.
So if you can't attend live, attend at your convenience.