Tom --
I am also likely to want a pair of raw castings. Will PM you for some
off-line discussion.
Following are comments to keep "Bobsy-talkers" apprised of other
upright technical matters:
1) I just finished a phone call with Ron Mong who said the original
casting patterns are long gone, so no glory there!
2) Your original thought that the extra material is to allow for
machining tolerances is most likely correct. The patterns used to make
the molds casting would be even a bit bigger than the finished raw
casting you have in hand. Shrinkage allowance for the TBD magnesium
alloy used back-in-the-day might have been different than what is used
for Al castings.
3) My recollection is that the lower part of the casting (where the
oval thru holes are) is hollow (beyond the outline of the oval holes).
It shouldn't be to hard to create an approximate core to recreate that
hollow space. Do you know if the foundry would plan to do so?
My thanks also for doing this legwork!
Lee
On 11/29/18, Tom Quaranto <tquan277@xxxxxxxxx> wrote:
Gents=========Thanks for being a subscriber to Bobsy Talk email. Be sure to also
I thought a pic of the original Unmachined Bobsy uprite to be used as a
master for the proposed casting might be helpful. The #10 makes
identification easy.
I have more pics but the freelist site limits the size of the email file. If
you want more pics email me directly with your need at:
Tquan277@xxxxxxxxx
Tom
www.freelists.org/archive/bobsy_talk/. >>To unsubscribe to Bobsy Talk go toTo see an archive of past Bobsy Talk emails at
