Good old pencil and paper is the mainstay of preparing rough sketches and quick diagrams in the workshop, but away from the workshop we prefer to use some kind of drawing package for presenting to our customers and for accurate dimensioned drawings for use in the workshop.
Our favourite package is Sketchup Make from Trimble. It is a powerful 3D drawing programme and best of all it's free. It takes some getting used to but thankfully there are comprehensive video tutorials to instruct you along the way.
