Running-through
A rather questionable method in some foundries of trying to produce clean sound castings by forcing more or less fluid metal through the mould and out at the riser after the mould is full. If the mould manifests a condition of unrest by voiding air or steam, which should have been carried away in a more legitimate manner by the process of venting, it is well to continue the pouring slowly in order to compensate for what is thrown out at the gates and risers; beyond this it is simply waste, as neither dirt nor gas, remote from the risers, will be favorably affected by such a method, no matter how long the process is continued. The value of running through into built-up risers accrues from the increased pressure exerted on the casting. See CUT-OFF; RISER.
Run-up.--A foundry term, signifying that the mould is full of molten metal. If there should be any lacking, it is then called "short-run." See SHORT-RUN.