[magnets]

Looks like a great robot! I'm a big fan of the color scheme you guys have - it looks pretty professional. The rack and pinion grabber system is a neat solution too.

However, I really recommend that you don't ever use a drill chuck to hold an end mill as you're showing in the video. The drill chuck really isn't a collet or a tool holder, and isn't designed for side loads or gripping end mills. You'll get a poor surface finish, lots of chattering, reduced end mill life, and the risk of damaging the spindle, the chuck, or somebody.

I know this the hard way. A student used a drill chuck with an end mill to spotface a hole, figuring an endmill could be used as a drill bit in a drill chuck. The jaws of the chuck were insufficient to hold the end mill, the bit caught the part and bits of metal went flying across the room.