Hopefully no duplications to links any already posted. These are mostly model engineering ‘engine’ focused links, but lots of associated machining techniques & knowledge.
Home Model Engine Machinist Forum
http://www.homemodelenginemachinist.com/
Model Engine Maker Forum
http://www.modelenginemaker.com/index.php
Conley Precision Engines
http://www.conleyprecision.com/609updates.htm
Internet Craftsmanship Museum
http://www.craftsmanshipmuseum.com/
Phils radial blog
http://philsradial.blogspot.ca/
Paz’s model engines
http://homepage2.nifty.com/modelicengine/index%20english.htm
Tom Blough
http://thebloughs.net/
Home Model Engine Machinist Forum
http://www.homemodelenginemachinist.com/
Model Engine Maker Forum
http://www.modelenginemaker.com/index.php
Conley Precision Engines
http://www.conleyprecision.com/609updates.htm
Internet Craftsmanship Museum
http://www.craftsmanshipmuseum.com/
Phils radial blog
http://philsradial.blogspot.ca/
Paz’s model engines
http://homepage2.nifty.com/modelicengine/index%20english.htm
Tom Blough
http://thebloughs.net/