Still trying to wrap my mind around all this myself.
There’s a bit on this on the wiki: https://shapeoko.com/wiki/index.php/Materials
I believe that we should start with the specifics:
- http://carbide3d.com/shapeoko/feedandspeed — the official chart (Imperial) — there’s a metric spreadsheet at: Shapeoko & Nomad - Feeds & Speeds Charts and a sortable table at: https://shapeoko.com/wiki/index.php/Materials#Official_Feeds_and_Speeds
There has been a pair of blog postings by Bob Warfield of the CNC Cookbook:
- http://carbide3d.com/blog/2016/feed-and-speeds-part-1/
- http://carbide3d.com/blog/2016/feed-and-speeds-part-2/
and he has a bit more at: http://www.cnccookbook.com/CCCNCMillFeedsSpeeds.htm and of course there’s the G-Wizard program which he publishes.
There’s been some useful stuff posted here as well — I’m going to look things over and try to put together a ground up discussion and hopefully we can all achieve a better understanding.