[louieatienza]

For the frequently used and smaller endmills, I keep extras on-hand. General-purpose endmills, even in solid carbide as most of mine are, are not that expensive really. I only do this part-time but I've learned my lesson after missing a promised delivery due to a broken bit. It really looks unprofessional to your client.

Needless to say, I didn't buy all these in one fell swoop; this is about three years worth of purchasing, experiementing and such. I buy tooling when the need arises.

Hope this is of benefit to others, and if there are other bits of mention, or if you want to show off your 'collection' that would be cool!

[louieatienza]

Example of mortise compression spiral in action, cutting northern ash:
DIY CNC Router, cutting BASS GUITAR BODY, part 1: PROFILING - YouTube

PCD SERF cutter, roughing G10 Garolite:
Milling 3/8" G10 Garolite, Home Made CNC Router, High Speed Toolpaths - YouTube

Amana insert 90 degree V-bit:
DIY CNC V-Carving Celtic Knot MDF, Part 2 - YouTube

Amana 1/8" spiral-"O"-flute:
Milling Harley-Davidson logo out of 1/4" aluminum, part 3 - YouTube
Home Made CNC cutting aluminum clock gear 1/4" thickness Part 1 - YouTube
You can hear the difference between a 1HP and 2-1/4HP router, as well as the wood frame and aluminum pipe of the Solsylva versus the Rollon linear rails and phemolic frame.

Onsrud 1/4" Super-"O"-flute: (rdoc limited to save router!)
DIY CNC Router, Aluminum Milling High Speed Motion - YouTube

Kodiak 1/4" ball endmill, contour finishing (3D offset):
DIY CNC Router, cutting BASS GUITAR BODY, part 3: CONTOUR FINISHING - YouTube

Generic 1/4" 2-flute endmill, roughing and finishing, aluminum:
DIY CNC Router, cutting BMX chain sprocket, Part 1: Pocketing - YouTube