I did the die grinder blender a while back and it didn't work that well. I took the gear driver off the motor and mounted it on a post that I put in my die grinder. The problem I had was keeping it seated on the jar base. I could probably have spent a little more time on it and gotten it to work but bottom line it was more of a pain to use than it was worth and I killed the blender trying. I remember thinking I was better off keeping the $20 blender intact and just plugging it into the power inverter in my truck. Problem there is you're carrying around this full sized heavy kitchen appliance. It sure would be nice to make some margaritas in camp tho. :sombrero:
Keep in mind that your drill probably spins around 1500 RPM (in the fast speed gearbox), the die grinder may spin around 27,000 RPM, a 1/4" impact driver spins around 2500, and your blender may spin from 500-37,000 RPM depending on what speed you select and how expensive a blender you own. The die grinder would be best from an RPM perspective but it may get hung up on the ice occasionally. A 1/2" impact I think would just destroy a blender. Lol...
If it were me and only making one or 2 smoothies a day I'd grab
one of these for the price and size it seems about right. Whether or not it has the balls to grind ice, etc for margaritas is TBD.
I do like the V-8 blender but a PTO on the transmission is probably not very practical for the average smoothie maker.