Good draughting practice - Part One

Having come from a traditional drawing board background and trained in the 'art of draughtsmanship' I'm always surprised how poorly drawn most CAD drawings are I receive.

So I thought I would share my experience with you and hopefully help put the traditional draughtsman back into CAD.

Most of my comments on here will generally relate to construction/engineering style drawings

Part One: Text Heights

Notes on a drawing should be easy to read and traditionally all general notes were 'stenciled' at a height of 2.5mm, with headings or titles larger at 3.5mm or 5.0mm. Perhaps the only reason to vary from this would be lack of space in a particular area of the drawing so a height of 2mm could be used. Anything smaller than this will start to become difficult to read.

So for a typical CAD drawing with a scale of say 1:50 actual text heights in model space would be as follows:

2.0mm = 100mm
2.5mm = 125mm
3.5mm = 175mm
5.0mm = 250mm

Again good practice would be to assign a pen width increasing in size as follows:

2.5mm text height = 0.25mm pen width
3.5mm text height = 0.35mm pen width
5.0mm text height - 0.50mm pen width

Well that's part one over with. Any comments or your own suggestions for good draughting practice will be most welcome.