"Sprue Base" is the word you're looking for.
When using a 5x7 inch flask, I sprue off a 3/8" center rod of beeswax and gate
maybe 60 injections off this rod ... yield is 100%. Ya gotta have your melt at
the proper temperature for complete runs.
Very little re lostwax casting has been "invented" lately ... this is 6000 year
old technology. Common sense and notes of what you've done before is the secret
Winston W. Harness
Basically I believe I have been doing things correctly per the forum
advise... paper and the grease I've never tried... NEXT TIME! Like the idea
it provides of the temp problem, as well as sealing ... my pours with lets
say a TREE of 8/10 items only produces about 4/5 items.. for that reason I
have been trying a method suggested by a local production caster... NO
TREEs,... using a DOMED CENTER RUBBER POURING CAP(Best description I can
think of .. what the h .. is the proper name anyway!??) spur with 1/8 wax
stems all over the dome(like porcupine quails) .. This, with a relatively
large cylinder( 4 inch??) provide about 20/25 items with NO .. I said NO
parti cal casting(Like.. 98% return!.. 'Ain't All Bad!!!! . . Dude'
What Say You.. Ever heard of the method before.. Think he invented it???