Hey dudes,
I made a little mod for my mill and thought someone else might find it useful. I have a Grizzly rotary grinder that I bought on sale for $30. The engraving on my SX3 was too slow with the 1800 RPM max speed, so I made this little rig to attach to my mill head and give me 8K-35K RPM and it accepts my 1/8" carbide engraving bits! It attaches/detaches easily with two M8 screws at the top and allows proper ventilation for cooling of the grinder. I made some design adjustments after this first prototype .. but it works so well that I will probably never get around to remaking it. If anyone is interested, I will send you the solidworks files

It's this one H6155 Rotary Grinder w/ Tool Shaft