Love the idea behind this book. It gets some great reviews too.
From the book description:
Save time with this collection of straightforward, common-sense techniques that provide quick, accurate solutions to your engineering problems.
Rules of Thumb for Mechanical Engineers assembles hundreds of shortcuts, calculations, practical "how-to" methods, and concise background reviews into one convenient volume.
Whether you're concerned with design, selection, or performance, you'll find fast, accurate answers here - all without wading through pages of theory.
Experts from all engineering disciplines have packed this book's sixteen chapters with design criteria and practical tips. You'll find easy-to-read descriptions on fluids, heat transfer, thermodynamics, seals, pumps, and compressors, drivers, gears, and bearings, as well as piping and pressure vessels. Also covers tribology, vibrations, materials, stress and fatigue, instrumentation, and engineering economics.
Here's where you can check out the details of Rules of Thumb for Mechanical Engineers.