Superb slideshow overviews from MIT Precision Machine design course. Interesting URL :-) While these are necessarily an overview there are lots of useful ideas. Chapter 10 - bearings http://pergatory.mit.edu/2.75/2_007%20Lectures/Topic%20%2010%20bearings.pdf The rest http://pergatory.mit.edu/2.75/2_007%20Lectures/ Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist