100model
Well-Known Member
I poured water in a glass to see how much turbulance there is compared to doing the same thing with molten cast iron and as it turned out can give a different result.
Using water to simulate molten cast iron.
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I let my runner(s) go past the mold cavity, and into a spin trap, and use gates at the top of the runner(s).
It takes a slightly larger crucible, but the entrained air and trash get swept into the spin trap before they can get into the mold cavity, and a nice hot flow is established prior to beginning the mold fill.
I get pretty consistent results with the spin trap on the end of the runner, and gates at the top of the runner.
And of course vents out the top of the mold (LOL, this is an inside joke between me and 100model).
.
It takes a slightly larger crucible, but the entrained air and trash get swept into the spin trap before they can get into the mold cavity, and a nice hot flow is established prior to beginning the mold fill.
I get pretty consistent results with the spin trap on the end of the runner, and gates at the top of the runner.
And of course vents out the top of the mold (LOL, this is an inside joke between me and 100model).
.
Viscosity of iron is 10x viscosity of water. That will have a significant effect.
100model
Well-Known Member
I am surprised that it is that much.
I think I kinda know what you mean by a spin trap ... but would love to see a picture or two!
Spin trap example:
www.homemodelenginemachinist.com
Spin Trap Example
Here is a rough example of the spin trap that I use. The sprue should be kept short, not much above the top of the drag. The sprue should transition smoothly into the runner (don't use a rough transition like the screencap below). The gates should be on the top of the runner. I generally put...
www.homemodelenginemachinist.com
Thanks!
