@Onoff I will try to do a pour this week!
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New element connections. Last time I crimped copper tube around it to suck some heat out - copper melts at element temperatures! But Im out of scrap tube.
This time I gas brazed the copper with sillicon bronze tig rod and borax. Near enough the melting point and should add enough mass at the hot end to prevent connections melting.
Burn out complete for today, only 230c..
here was nowhere near enough brass. The pour basin and sprue went dry, almost none in the riser, quite a bit of unplanned leakage. The result is a lot of shrinkage all over. Cows face is worse than last time.
Do you recall being taught about " Eureeka , Eureeka , I've found it! Shouted out to his wife when he was in the bath550g of nuts. Later I added another 210g, the runners and riser of the last melt - all from the clean nuts.
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I messed about with sand a while before deciding on this approach. However the sand needed seiving so was a little lumpy, wasnt my best attempt!
The steel sheet was 0.8mm thick, seemed ok to stop the sand getting in while ramming, the plaster wasnt damaged.
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As I was getting ready I turned the heat up, then I noticed the element had fallen. However it was still making good electrical contact so i turned it right up 2500w until it got to 886c.
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There was nowhere near enough brass. The pour basin and sprue went dry, almost none in the riser, quite a bit of unplanned leakage. The result is a lot of shrinkage all over. Cows face is worse than last time.
I did attempt to video but again cocked that up with the camera pointing at me for most of the pour.