The power take off on the Kitchenaid mixer is definitely an underutilized resource and his use of it was inspired. I decided to make my own version of the same concept...well...because I wanted to.
Let's proceed shall we?
Step 1: Stuff to Get It Done
Step 2: We Need Power
Kitchenaid attachments all have a square drive shaft that rotates inside of a cylindrical sleeve. The drive shaft fits into a square socket in the mixer and a set screw holds everything together. I didn't want to feel left out so I decided to emulate this arrangement.
I had a threaded drill attachment that I ground square on one end to fit into the mixer. The other end had a male thread so I drilled and tapped a hole into the shaft of the grinder to accommodate it. I don't have a metal lathe but my friend has a wood lathe that worked just fine for this.
Step 3: More Adapting
The next task was figuring out fow to attach the pipe to the grinder. Lacking a real metal lathe I looked at plumbing parts for a solution. I ended up going with a floor flange. It was enormous compared to the face of the grinder but I figured that could be remedied.
I started by cutting the flange down with a metal cutting chop saw until I had a square about the size I needed. I mounted this in the lathe and took an angle grinder to it until I had an approximation of a circular flange that matched the grinder. It still had that handmade look but that's OK.
The last part of this was to mount the flange to the grinder. I drilled and tapped some holes for some small socket head screws. The tolerances were rather close so it was quite a bit of fiddly work but in the end it got worked out.
The other end of the grinder head was a breeze. The coffee mill also had a square shaft. It was dimensioned perfectly for the square end of a 3/8" socket. The shaft coming out of the grinder head had a layer of fiberglass over it and fit very snugly into an 11mm socket so I just took the socket and hammered it onto the shaft. It friction fit perfectly!
Step 4: Attach the Coffee Grinder
I didn't want to demolish the grinder in the process of doing this project so I thought a long time about how to bring the coffee mill and the angle grinder together.
I ended up prototyping in cardboard until I had a design that I was happy with. It only required one set screw into the coffee mill and attached to existing holes in the grinder head.
Step 5: Make It Real
After the cylinder for the attachment was fabricated I cut out the spout for the top and attached it with rivets as well.
Step 6: Well?
If you like projects, you know who you are, you'll find plenty more at our site: Mike and Molly's House where we chronicle our Mighty Projects on our Mini Farm (aka our backyard).