The lug stamping process is beautifully explained in the
1994 Bridgestone catalog posted on Sheldon Brown's website. It looks like Grant Petersen's work.
Stamped Steel Frame Parts
...and How to Make Them
How sand casting parts is done.
Sand Casting: Steps 1, 2, 3, and 4
Sand Casting: Steps 5, 6, 7, and 8
__________________
- Stan
my bikes
Science doesn't care what you believe.