Typical Colors of pens/pencels use in changes in drawing
Head of Engineer and Designer Purple pencil or pen,
Drafting and Engineering Green pencil or pen,
Machine shop Red pencil or pen,
Weld shop Silver pencil,
Clients Blue pen or standard pencil,
Standard Pencil lead by any one Strike though not use or change,
Under line important dimension to hold,
Circle shows change for press or running fit,
Highlighter use by any one Yellow only
Only the wording has bend change from the book due to copyrights
The book is still being written is not publish at this time on machine
work .
David Smith Clovis CA May 25 ,2015