11-17-2012, 04:07 AM
Hello Tom,
One little tip here I wish to pass on. Now everyone who has worked with red hot metal knows that it gets a scale build up on all surfaces exposed to air.
When CC Hardening we don't want any of that happening to a polished part, do we? Now, no matter how careful you are in packing charcoal and bone into a crucible there will be air in the gaps between the grains of hardening compound.
The air can be eliminated simply by folding up a sheet of paper until it fits inside the top of the crucible beneath the lid. When the crucible heats up the paper will ignite, consuming the oxygen inside the crucible and what is left behind is carbon so there's no conflict likely it's simply adding to the carbon already present.
Harry
One little tip here I wish to pass on. Now everyone who has worked with red hot metal knows that it gets a scale build up on all surfaces exposed to air.
When CC Hardening we don't want any of that happening to a polished part, do we? Now, no matter how careful you are in packing charcoal and bone into a crucible there will be air in the gaps between the grains of hardening compound.
The air can be eliminated simply by folding up a sheet of paper until it fits inside the top of the crucible beneath the lid. When the crucible heats up the paper will ignite, consuming the oxygen inside the crucible and what is left behind is carbon so there's no conflict likely it's simply adding to the carbon already present.
Harry