If you’re of a certain vintage and have ever done any technical drawing, chances are good that you used a r0tring of some kind, be it pencil or pen. Well, r0tring makes more than writing implements.

On a technical drawing, the dimension that you want is called the nominal. But, no manufacturing is ever perfect, so you have to allow some wiggle room in what you’ll accept. That wiggle room is ...

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Created to simplify and codify the use and understanding of geometrical tolerancing, this innovative guide is an essential tool for anyone who needs to specify or interpret product specifications to ...