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Are you suggesting a real cement mixer or an attachment for a drill that's used for mixing in a 5 gal pail. I think a mixer has about the right speed but not the proper fins to distribute the ingredients evenly because sausage mix is a lot dryer than a concrete mix. An attachment on a drill would work but it would beat up your food grade pails and then food safety becomes an issue. A meat mixer is the way to go.
Forgot to add that I use my kitchen aid mixer with the dough hook to mix sausage. Still a bit of a pain because I usually make 15 lb batches and can only mix 5 lbs at a time.
I alway cut the meat up, then throw all the seasonings on that then put the meat through the grinder. I find doing it that way adds more flavour to the finished products
Mixers need to Cut into, turn and knead the meat. Sausage is not liquid enough and eventually you would have the blades rolling a log in the center of the mixer without cutting ingredients into the center. Look for a used, table top 20Qt+ Hobart Mixer, Buffalo Chopper or Vertical Cutter/Mixer...JJ
I've used my cement mixer for a lot of things, cleaning brass, mixing peat, polishing/deburring metal and stone. As
jimmyJsaid about cutting into the meat and mixing the sausage would be a problem. If it was clean I don't see why it wouldn't work with say tumbling whole turkeys. If you could just figure out a way to pull a vacuum.