I’ve been trying to build a charcoal grinder and studying other people’s builds. This post is my attempt to gather some of the information I have collected.
It seems like Gary Gilmore’s grinder is one of the most popular.
From a description on one of Gary’s videos, it is made from 3" steel pipe with 1/2" square teeth welded on.
Another charcoal grinder is from Chuck Whitlock where he used 12" long pipe with 1/2" teeth.
Kristijan Leitinger made his grinder tractor powered.
Cody Edison Tate made his simple grinder using flat barstock as the cutters.
Take round bar and flat bar, drill holes in the flat bar and braze or weld into teeth.
Then opposite of that make the static teeth with about a 3/8" gap.
Then I found a post by Bruce Southerland.
I’m not positive this particular one is made out of PVC but I think it is and the bolts and nuts used as the teeth looked easy.
My main problem was lacking a piece of steel pipe big enough to make my grinder. I used a smaller one that is about 2-1/2" outside diameter with a few teeth welded on and it works but it is powered with a hand crank and is slow and dusty to use.
I did have a piece of PVC pipe that is 3 inch inside diameter and 3-1/2 inch outside diameter. The circumference of a 3.5" circle conveniently is very close to 11 inches which is the size of a normal piece of paper here. I just had to fold it up and wrap it around the pipe to divide it.
I marked it out and drilled a bunch of 1/4" holes.
Checking my jar of assorted nuts, bolts, and washers, I picked out a couple different combinations for the teeth.
The inch long bolts with 2 nuts gave me a bit over 1/2" high teeth. The 3/4" long bolts with one washer gave me about 3/8" high teeth.
These will still need tightened down and I need to make some plugs for the ends of the pipe and figure out how I’m going to drive it but it should grind my charcoal faster than what I have been using assuming this idea works.