Anyone have a good recommendation for a feeds and speeds calculator?
I’m searching myself.
Many are not suited for low power spindles, tiny tools or softer then usual materials.
The shapeoko wiki has some user submitted info that may be good as a starting point for smaller machines. http://www.shapeoko.com/wiki/index.php/Materials
Okay…converting evey number into proper metric units makes it hard to read. 
Soft wood (softer then plywood) is the strongest material I’m workin with on the small machine.
It’s mostly waxes and foam.
Us 'Muricans love our SAE units. Although, I do prefer to do all my design work in mm. I can tell you that my numbers are normally higher than what is posted in that wiki though. For example, I use a DW660 as my spindle and I normally run through pine at 1700mm/min with 1.5mm depth passes using a two flute straight end mill.
This American hates SAE. All the cars I have ever had were metric. The 1/8th scale nitro buggies I built were metric. I can usually tell what size screws or bolts are in metric, but, SAE make no sense to me. Unfortunatly, finding metric parts at a hardware store is not easily done.
Mach 3 has built-in feeds and speeds calculator, doesn’t it ?. I have never tried it, but saw it in a tutorial video yesterday.
where?
In mach 3 on the program run screen in standard screen mode, there is a field in the middle, where a button says NFS Wizards, try to press it 
@Peter_Fouche1 I either haven’t figured out how to use that calculator or it’s not well suited to my setup (Sherline with TinyG) because the speeds and feeds recommendations seem crazy aggressive (for brass, etc.).
@Peter_Fouche1 I think so. I’m using the “low power” (1/3 hp?) setting in the tool section with a 10k rpm (max) spindle and a 2 or 3 mm carbide end mill and I can’t get a recommendation for most cuts at all it seems. If I let it pick everything for me it seems to want incredibly deep cuts at F100 (metric, my max feedrate). I imagine with the much reduced rigidity of a Shapeoko or similar the problem would be even worse. Pretty good chance I just need to dig into it some more or ask the CNC Cookbook folks for help though.
Don’t forget Mach 3 was designed for full sized Horizontal Mills and Lathes in a machine shop and much of the feed rate information is based on those larger drives.
Since this entry was active last, i have had good use of this http://zero-divide.net/?page=fswizard