Do the air set/no bake and CO2 moulding sands allow use of less draft than green sand?
I drew up the Webco head and the long (2 1/4") upper fins have about 1.25-1.5 degrees of draft, while the short fins on the underside of the head are about 5 degrees. I'd thought that 5-7 degrees was pretty common, but I found a reference saying 1/8"/12" could be used, though it didn't specify which type of sand that was for.
I suspect the Webco heads were sand cast, though I've never seen mention of what process was used.
cheers,
Michael
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