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Here is a overview of my first roaster :)
It was a proof of concept and it has done hundreds of roasts, most of them over a pound :)s:1s:2



I started with a Bread Machine from a thrift store, for about 3 bucks. They vary in price all the way up to $20.. but I just get the inexpensive ones.


This is what I started with:
s:8s:8c:1



I chose this one because it has a strong locking mechanism to hold the bowl to the bread machine. s:2


Here is the inside of the bowl:


It has done some roasts B)

You can see how I cut the bottom of the 8 qt mixing bowl out and replaced it with the bottom from the bread machine loaf holder.s:4


This keeps everything aligned well.

The thermocouple threads down through the ss tube on the left top.

You can see the mods I did to the paddle.


Unfortunately I trusted Hi Temp RTV to hold it together.
s:3s:3s:3s:3s:3s:8s:8s:8

It is safe enough, but it failed in about 6 months. s:7 s:6



I had to replace it with screws. A better choice.
s:2
It mixes better when there is less deflection also.

The hole that the shaft goes through is too large, s:8s:8

so I had to make a washer to fill in the gap. c:1




The bread machine in this version uses the original outer sheet metal and controller.


c:4

The bowl protruded out the top so I had to add some flashing to hold the insulation in.

s:8s:8

The Galloping Gourmet convection oven does a good job. s:2

I had to take it out of it's glass lid and mount it in pot lid that fit the mixing bowl nicely.B)

Here is a pic of it mixing one pound:


c:1c:1


and another with two pounds of green coffee beans:



Even though it appears that it could roast more than a pound, it has difficulty because the beans expand, It needs a larger bowl :D


and a lot of heat is lost that could be retained with better iinsulation. s:8s:8

My next rendition will address these issues





First real problem with this roaster this week:(
The screws pulled through the aluminum holding the clamp section onto the ss bowl!

Second picture from the top s:6

It needed taking off, replacing the screws with larger ones, and filing them down so there was no drag. Also upgraded the insulation.
This makes a good reason to mount the aluminum outside of the SS bowl, like the new version will be. Only the stirrer on the inside.
It works fine again. B)
Need to keep it running while building the new one. Almost have all the parts now:D