- May 25, 2009Hello Group,
Just thought I'd post a picture of a casting I made today.
<http://www.pacificsun.ca/metal.pics/gear.jpg> I was making some cores
so I used my core mix for the gear. As a result, the finish is rough. At
least I proved I could cast a gear with teeth much like the old timers
did before the days of shapers and milling machines. :-) I intend to use
the same procedure using a finer grade sand to hopefully improve the finish.
The core mix I normally use is a fine grade silica sand blasting sand.
I believe the grit size is about 80. Added to the sand is enough sodium
silicate to give the mix the appearance of stiff cookie dough. I filled
the flask with no ramming and then gasses the flask with CO2 to set it.
Camrose, Alberta, Canada.
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