I purchased five 8 and 10 cavity H&G moulds that had been neglected and in a storage unit for who knows how long. They had rusted a bit and with a TON (and I mean a TON) of TLC, Naval Jelly, steel wool, sharpend wood dowels, and oil, they have been cleaned up rather nicely. I would estimate that I have at least 8 hours of TLC work in each one so far. Worth every second I might add.
Some of the cavities have some minor corrosion in them. My understanding is that you need to lap the cavities to bring back the smooth cavities like the original condition.
Do I use one cast bullet per cavity (taken from and used in that cavity only) or can I use one bullet for all eight/ten? I have purchased some valve grinding compound and will use it judiciously.
Are there some detailed description of the process? I know I need to put a screw in the bullet after casting, put some valve grinding compound on it and gently turn it a few turns.
Other than that, I have no idea how to do this. I am not the most mechanically inclined human on the planet so any and all help is appreciated.
Please be as detailed as you can be.
I want to bring these moulds back into service. They are truly works of the machinist's art. A friend of mine that runs CNC machines and does aerospace and defense work to incredibly tight tolerances (but has been doing machine work for 35 years) marveled at the quality of workmanship and skill it took to create these on Bridgeport lathes.
Your assistance is appreciated.