Well, I used up three different bags of old charcoal and nothing dripped out of the bottom of the furnace. It took nearly two hours to start burning properly as well. I'm guessing now that it's right on the edge of developing the 660 degrees centigrade that I need. Which does make sense as last burn was quite partial in terms of what melted and what didn't. So next time I'll go with new good quality lumpwood...
On a more positive note, with all the heat my green sand dried out but held the shapes that I pushed into it, so sand casting is looking workable at the moment.
Cheers
Graham
Thursday, 4 June 2009
Monday, 1 June 2009
Another burn
Hi
The furnace is running again. I used old charcoal on top of fresh and it took a couple of hours and lots of meths to get it all burning OK. No sign of any aluminium dripping out from underneath which is a shame. I had used green sand and made some impressions to test it out but I guess with the slow start it just never got up to temperature.
Tomorrow will tell what happened.
Graham
The furnace is running again. I used old charcoal on top of fresh and it took a couple of hours and lots of meths to get it all burning OK. No sign of any aluminium dripping out from underneath which is a shame. I had used green sand and made some impressions to test it out but I guess with the slow start it just never got up to temperature.
Tomorrow will tell what happened.
Graham
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