The powder, certainly, but water has a pretty constant density. It
shouldn't make any difference whether you weigh or measure volume.
Theoretically you are right, practically, not. Please remember,
first of all I was quoting someone from Kerr who was helping me
trouble shoot my problem. I mentioned I was having an issue, when I
started weighting, as I had previously used a milliliter measuring
container, I solved my problem.
Casting 9 3"x7" flasks 3 times a week with 50 to 75 pieces, I
couldnot suffer the time and expense to redo the pieces. My
experience was that after trying to vary the flask temp, melt temp,
how pieces were sprued, weighing the water made the difference.
I do not know why, but when I put the weighted water in the
milliliter container, it was not the same as the markings. I would
suspect that if the weighed water is accurate, when compared to the
volume measurement, if they are not the same, I suspect the container
is not accurate.
If Noel reports back that weighting the water solves the issues,
then it did make a difference, as it did for me.
One more point. There are discussions about centrifugal vs vacuum
casting. I use centrifugal. For the first time, I just sent out
about a dozen different pieces, a dozen copies of each to be cast.
They use vacuum. They had miscasts and had to redo because how I
sprue works fine for centrifugal, but presents a problem for vacuum
casting. I need minimal spruing for two reasons, ease of clean up,
and there are textured areas and I do not want to sprue on the
textured area, so I sprue to the edge of a ring. I have made
thousands of pieces spruing like this, but there was a learning curve
for this caster with myway of doing it.
I started casting over 35 years ago because casters could not do my
pieces the way I needed them done.
Richard Hart G.G.