Instead of paying over $50 for a 4" piece of solid 6061 Al that is 3.5" diameter and boring hot most of it I thought I'd cast something that looks like this:
In this case the draft tapers (3 degrees) run opposite to each other to make pulling out the green sand simple.
Alternatively the tapers go in the same direction.
Here's a quick sketch that might help explain.
In both cases the parting line between cope and drag is at the bottom although the one on the left could be turned around and pulled leaving the tapered cavity and inside part. The one on the left as drawn has the inside part suspended from the cope while the one on the right rises up from the drag and the cavity is in the cope.
I feel like I'm missing something here.
In this case the draft tapers (3 degrees) run opposite to each other to make pulling out the green sand simple.
Alternatively the tapers go in the same direction.
Here's a quick sketch that might help explain.
In both cases the parting line between cope and drag is at the bottom although the one on the left could be turned around and pulled leaving the tapered cavity and inside part. The one on the left as drawn has the inside part suspended from the cope while the one on the right rises up from the drag and the cavity is in the cope.
I feel like I'm missing something here.