ECN Forum Forums General Topics of the Trade General Discussion Area Casting metals in your back yard.

11. Pouring alloy, main casting. 99.9% tin, 0.5% copper at 511°F. TheRTV,[ ‘Rhodia’ 3255, there are other brands ], has a limit of 572°F.
-Hence the need for accurate temperature control to conserve mold life.


12. Infra red thermometer measures melt temperature.


13. Problem: IR thermometer cannot ‘see’ liquid metal due to it’s low emissivity. My solution was to float some chunks of graphite on the melt and measure their temperature.


14. Die showing hollow sprue. Anything over 32 grams [1.13 oz] was ejected!
-Hence need for higher guard! In future I need to make rotating headers with a smaller hole at top
and with a larger recess under, to allow more metal to be poured and retained as the sprue.


15. Die opened showing castings in impressions. Zero flash, no leaks and pads filled.


16. Plaque / balancer / pads / runners assembly, on hollow sprue. ‘Regie Nationale’.
Reproduction is astounding- it cast my thumbprint left in the release agent!




[This message has been edited by pauluk (edited 11-10-2006).]