Sergei Slovenija
Member
- Messages
- 1,180
- Location
- Slovenija Ljubljana
I re-read a huge topic on color hardening from fans of Marlin rifles.
I want to try this method for non-weapon parts made of mild steel. Including ~1 meter long.
I've been saving up thick bones for almost a year for another project (pressed bone, like ivory). You cook the broth and put the bones in the freezer for storage.
By the way, it turned out experimentally that even cooking the broth for two hours does not extract all the tasty fat. At least 2 more iterations will allow you to get the broth.
Before preparing to place the bones in a steel retort, I tried boiling the bones in caustic soda to remove excess organic matter. In my opinion, this is an unnecessary operation.
To avoid the stench, after burning out the bone charcoal, I welded a long steel pipe + a corrugated flexible stainless steel pipe on a thread to the retort to release and trap gases and oil in a water seal.
The bones were crushed and tightly compacted into a piece of steel pipe, and the ends were welded with lids. Gas release hole 6 mm.
Heating with a low-power propane torch, made from a converted acetylene torch. The muffle furnace is assembled from bricks. The process was accompanied by the active sound of gases and the gas stopped coming out after about 5 hours. I believe that the power of the heating source and a more optimal oven chamber and thermal insulation would speed up the charring process.
While the bone charcoal is hidden in the far corner and waits in the wings. I need to grind prototype parts for testing and figure out how to catch the cloud of smoke from the hot coal falling into the water from hardening.
There are big problems with the source of bones. For the first experiments, the quantity produced will be enough for me. I have two spare ideas for this. Make homemade pellets from bone meal or make pellets from tricalcium phosphate and then burn them.
It remains to deal with the question of what size are the pieces of coal that American gunsmiths use. Their particle size system is not clear to me.
I want to try this method for non-weapon parts made of mild steel. Including ~1 meter long.
I've been saving up thick bones for almost a year for another project (pressed bone, like ivory). You cook the broth and put the bones in the freezer for storage.
By the way, it turned out experimentally that even cooking the broth for two hours does not extract all the tasty fat. At least 2 more iterations will allow you to get the broth.
Before preparing to place the bones in a steel retort, I tried boiling the bones in caustic soda to remove excess organic matter. In my opinion, this is an unnecessary operation.
To avoid the stench, after burning out the bone charcoal, I welded a long steel pipe + a corrugated flexible stainless steel pipe on a thread to the retort to release and trap gases and oil in a water seal.
The bones were crushed and tightly compacted into a piece of steel pipe, and the ends were welded with lids. Gas release hole 6 mm.
Heating with a low-power propane torch, made from a converted acetylene torch. The muffle furnace is assembled from bricks. The process was accompanied by the active sound of gases and the gas stopped coming out after about 5 hours. I believe that the power of the heating source and a more optimal oven chamber and thermal insulation would speed up the charring process.
While the bone charcoal is hidden in the far corner and waits in the wings. I need to grind prototype parts for testing and figure out how to catch the cloud of smoke from the hot coal falling into the water from hardening.
There are big problems with the source of bones. For the first experiments, the quantity produced will be enough for me. I have two spare ideas for this. Make homemade pellets from bone meal or make pellets from tricalcium phosphate and then burn them.
It remains to deal with the question of what size are the pieces of coal that American gunsmiths use. Their particle size system is not clear to me.