08-13-2012, 04:03 PM
(08-13-2012, 07:19 AM)TomG Wrote: Nice work John. It's been a long time since I've had the fun of machining a casting.
I assume by the blackening around the casting, that you use an oil tempered sand? Is it your own recipe or do you buy it already mulled. And what about flux? I know chlorine type degassers are used for aluminum, but do you also use some sort of flux for the bronze?
Tom
Hi
Tom
I used "petrobond" oil based sand to face the mould backed up with green sand
With clean bronze i dont use a degasser
Even with aluninium if you just stirr it well it seems ok
The commercial de gassers give off real nasty fumes
John