Lee
Yes that area is hollow to the bore area for the lower thru shaft to A arm
attachment.
I was thinking of having extra material added the hollow area at the bottom of
the pattern to prevent the hollow area being open to the shaft area. If you
have ever had to remove the shaft it’s difficult due crap/moisture getting into
the shaft as it is open after drilling. (At least on mine currently in use on
my cars)
Part of the cost is due to having to have molds made for the bearing bore area
and the hollow space you are speaking about. I thought due to the material
strength difference the slight loss in thickness would not be a concern.
Your thoughts are appreciated as we are at the right point to make any
changes/improvements.
Tom
Sent from my iPhone
On Nov 29, 2018, at 10:10 AM, Lee Johnson <leejohnson1313@xxxxxxxxx> wrote:=========Thanks for being a subscriber to Bobsy Talk email. Be sure to also
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:=========Thanks for being a subscriber to Bobsy Talk email. Be sure to also
Gents
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
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