What is the Checker?

The checker was an experienced draftsman whose only purpose was to check the drawing. He/she would mark every dimension and note with a red or yellow marker. Nothing was not marked. When the checking process was done it was given back to the original draftsman to do the corrections. This process was as important as the design and drawing. This is not some quick review this is a time consuming review of the design itself. If this step is bypassed or ignored the resulting costs for a missed error are 10 fold. Below I have described the revision process handling errors. Just think of the cost of a bad titanium part? It has always been a rule "Measure twice, Cut once". All draftsman knew and appreciated this, learning many lessons from the Checkers input. Murphy's law was the draftsman's arch enemy!

The draftsman learned from every job. Soon he/she became very knowledgeable in the standards of their industry. They became the designers of the products. Every large manufacturing company had a drafting group. Even though the drafting group was part of engineering it was basically separate with its own responsibility.

This is another reason for creating a complete AID (drawing) from our parts instead of allowing the minimizing of the information to manufacturing that is now being promoted by MBE. It is much easier to review and check. I will go into this later.