8611Re: [G104] The Tale of Two 'Jumbos' (More Questions)
- Aug 8, 2009Hi Don:
IIRC, your "old" M4A3E2 had a turret cast by Pittsburgh Steel Foundries
(PSF) while Cobra King's was cast by Union Steel Castings (USC).
Interestingly, these were both in the Pittsburgh area. The "dimpling" is a
result of how the molds or patterns were built, but I can't tell exactly
from the photo. If the metal is actually raised, these could be nail heads
holding sheet metal against the wood pattern skeleton. The sand molds would
pick this up and replicate it in the casting. If the casting is actually
dimpled, these could be foundry nails driven into the sand mold halves to
give them strength. Again, these would be picked up by the casting.
Here are some photos I had handy:
----- Original Message -----
From: Don Moriarty
While doing analysis between the two M4A3E2's ( RN 3083084 & RN 3083026) a
question of 'dimpling' in the steel on the turret exterior & interior of TN
38 has me curious as well as several questions which seem to pop up.
1) I assume the 'dimples' were due to production technique. This appears to
be unique to this Jumbo, and I can't find photographic examples of others
with similiar 'dimples'. Has anyone else noticed this elsewhere?
2) The turret serial # is located on the turret top & not on the side, as
most other vehicles / photos show. I assume this is unique to the
manufacturer. Are there any other example of this difference.
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