Making a New Mechanism for a Reciprocating Pencil Sharpener

An engineer’s greatest tool is the writing utensil. Be it pen or pencil, we use them for everything from making diagrams to marking out cuts. But as with any practitioner ….

Making a New Mechanism for a Reciprocating Pencil Sharpener. But as with any practitioner of an art, we can tend to become rather particular about the details. [Choronva Engineering] is not different, and to that end set out to re-invent the pencil sharpener.

In this case, [Chronova]’s ideal pencil tip shape is a concave cone. This is a shape quite trivial to make by using a knife, but rather impossible with a traditional twisting motion. But what if one automatized the knife whittling motion.

This is actually a very old idea, with examples dating back to at least 1910.