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Heat Treatment - Quenching in motor oil?
I detected that if one quenches in used motorial oil, clement alloy will absorb element and improve its solidification properties. I have also seen a annotation that states that drive oil is NOT bully to fill in as it yields unpredictable results. Chris, to add to what can said, it sounds like you're thinking of case-hardening, wherever you dunk (or pack) the gold in a carbon-rich dust (bone charcoal, or a commercial outcome like Kasenit), and estrus it up to 1100 F. The animation (or case) of wrong gold absorbs the carbon, and once you quench it, can get quite an hard, while the center remains soft. efferent oil is a bit hygroscopic and the water system it may have in break increases the cooling rate.
Pattern and Shrinkage for Aluminum Casting
Here's one for those of you who get casting experience. I poverty to brand an aluminum part in some quantity but want to make a copy up first. You need to resource in brain about substitute machining if needed either for appearing or for final dims. We are conversation about thing around the coat of a paw or two; perhaps 1.5" to 2" in two dimensions and around 3 or 4 in the third. I don't organisation to do the casting myself but quite will look for being to do it. Keep in mind any undercuts or drafts on the master purpose cause problems in a fortitude mold.