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seen Apr 26 at 14:43

Apr
1
comment Turn a tank a specific number of degrees
agreed, but the constraint on the question was encoders only. and since tank drive is a inherently a skid drive, accounting for the slippage correctly is not really possible without something like a gyro or external reference. In any case in practice, slippage of the pivot points on smooth regular surfaces is not an issue unless pushing something.
Dec
28
comment Exact dimensions of studless Technic beams
PS For fun, you can also look at CAD representations of the pieces. For example, Google Sketchup, free version. You can download technic pieces into it from the marketplace and measure in the app. Assuming you trust these to be authentic and faithful renderings. You get the same dimensions I quoted above. The stud proportions are actually quite important to keep in mind when designing models.
Dec
28
comment Exact dimensions of studless Technic beams
Sorry, should have included a reference: Chapter 1 of THE UNOFFICIAL LEGO® TECHNIC BUILDER’S GUIDE Paweł “Sariel” Kmiec This is a great technic reference and doubles as a primer on mechanical engineering. Available as a free ebook in pdf form.