Not to preheat (with exceptions)

Posted by Joe on July 22, 1998 at 12:50:33

In Reply to: preheat or not?
posted by ivan p on July 19, 1998 at 15:04:22

Generally I am impressed and agree with everything that Steve Ross said on the Wilson method.
One area he didn't stress but I might advocate (he does kind of cover it under safety considerations) is to heat the block to a minimum of 212F to drive off moisture to prevent "spatter".
After heating the block to drive off potential moisture, the assembly could be allowed to cool off to room temperature to retain the advantages of the Wilson "Cold Pouring" process.It is unlikely that any moisture will "reappear" in the interim.
I think this would be a good recommendation for both the block and the molds.Any oil that surfaces in this heating could be removed with acetone which evaporates fast once the block is "touchable" but warm.
Having poured a few machine tool bearings in my short life I can verify the aerodynamic properties of melted babbit, and their not so pleasurable landing.I have a plastic face shield with a study in random distribution permanently melted into it.
Best regards,
Joe

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