|Project by ironwoods||posted 523 days ago||1940 views||6 times favorited||10 comments|
Because I advertise wooden models for chemistry, geometry, and geology on my website: DrB Science Basics, I was asked by a biochemistry professor to make several custom jigs for large chemical models to be built as a summer project involving high school and university students. Those who have tried are aware that tetrahedral angles (109.47…. degrees) are very fussy and the design of a jig for accurately drilling them is not trivial. The sequence of operations for drilling a 2 1/4 ” diameter carbon atom is shown.
-- Eric, Maine,http://drbsciencebasics.com