Re: Model brake component size comparison to prototype
Ralph W. Brown
My understanding is that the sacrificial material used to make the molds for casting is, as the name of the process implies, wax, which melts and is absorbed by the mold when it is first heated leaving the void later filled with molten brass or other casting metal. I doubt plastic detail parts made by Cal-Scale or others would or could preform the same function, although I suppose they could be used as “masters” for casting the sacrificial wax patterns, copyright issues notwithstanding.
I suspect there are others here who are more familiar with the process and could provide a more detailed description of the process.
PRRT&HS No. 3966
NMRA No. L2532
From: Tim O'Connor
Sent: Saturday, April 4, 2020 9:15 AM
Subject: Re: [RealSTMFC] Model brake component size comparison to prototype
As I recall, all Cal-Scale detail components were OVERSIZE because they were used
for lost wax casting! In that process the plastic parts are for the molds and are
destroyed in the casting process, and the shrinkage produces parts that are closer
Or am I wrong? :-)
On 4/4/2020 9:00 AM, Lester Breuer wrote: