There's an obvious interest in CAD for some machinists, but others just don't want to take the time, effort, and (possible) expense of dealing with CAD. On the other hand, there is real benefit in being able to make a reasonably accurate design on "paper" before using up expensive metal.
For people who would like a really good drawing program at a good (free!) price I'd like to recommend LibreOffice Draw. It's not CAD (which may be an advantage for some), but it is still a very powerful technical drawing tool. To make it even more useful, I've built up a "library" of shapes commonly used (at least by me) for machine drawing. You can get a copy of my template (or just a more detailed look) here:
https://sites.google.com/site/lagadoacademy/libreoffice-tips/libreoffice-for-cad
As a bonus, LibreOffice also include word processing, spreadsheet, and presentation software which works with Microsoft Office formats. Get LibreOffice for Linux, Macintosh, and Windows for free here:
www.libreoffice.org/
For people who would like a really good drawing program at a good (free!) price I'd like to recommend LibreOffice Draw. It's not CAD (which may be an advantage for some), but it is still a very powerful technical drawing tool. To make it even more useful, I've built up a "library" of shapes commonly used (at least by me) for machine drawing. You can get a copy of my template (or just a more detailed look) here:
https://sites.google.com/site/lagadoacademy/libreoffice-tips/libreoffice-for-cad
As a bonus, LibreOffice also include word processing, spreadsheet, and presentation software which works with Microsoft Office formats. Get LibreOffice for Linux, Macintosh, and Windows for free here:
www.libreoffice.org/