In
1984, Thiokol of Brigham City, Utah, approached Voss for assistance in
development of a new, high-strength pin "retention band" used on
the joints of the Space Shuttles Solid Rocket Motors (SRMs).
The
SRMs consist of a series of sections approximately 12 feet in diameter and
stacked together and joined by means of radially-pinned rings.
The
ends of each segment are machined to form tang and clevis joints. Each
joint is fastened with 177 one-inch diameter steel pins that are held in
place with the Voss manufactured retention bands.
Voss
also supplies shims that are used to "make up" out-of-roundness
in the SRM casings.
The
retention bands not only help hold the SRM together during launch and
subsequent 124-second "burn", but must also hold the locking
pins in place during parachute recovery descent into the ocean when the
SRMs strike the water at nearly 60 mph. The bands must also resist salt
water corrosion for periods up to several weeks during recovery
operations. The bands were made well enough that they can be reconditioned
for reuse on subsequent Shuttle launches. |