I'd suspect your aero would have been caused by too wet a sand/clay mix (clay bonded brown sand?) if using petrobond you get none of that.


I'll be building 2 new furnaces this year, one for cast iron and another tilting furnace for Al.

I'll take some pictures and might break a habit and write about it :)

As for off topic....it's about Al so it's on topic [/quote]
:clap:Yeah it was a brown sand and i seem to remember it had to be preety wet to retain the shape, Cheers! the poor finish has always put my off doing it again, but like you said the posibilites and time saved in milling from billet would be well worth the effort.

Look forward to the pics and demo.

Are alloy wheels a good supply for melting down?