Study of Damped Set-Back Pins for S and A Mechanisms.
Abstract
The damped set-back pin study program was for the design, testing, fabrication, and delivery and damped set-back pin assemblies for use in a safe and arm device for artillery munitions. This damped set-back pin assembly is one of two safety features on a S and A device used in the M739 PD/XM587 ET fuzes for a rotating projectile. A pin, porous disc, return spring, floating O-ring, and sleeve comprise the selected damped set-back pin assembly design. Damping is acquired through the proper regulation and control of the air flow rate, return spring force, and the O-ring friction. Tests conducted to determine the design parameters and the structural integrity of the pin system included O-ring/lubrication compatibility testing, O-ring friction testing, flow rate measurements through porous sintered metal discs, and selected MIL-STD-331 tests. Two minor modifications were made to the existing bottom plate to incorporate the damped set-back pin -- the boss (closure disc end) that housed the present set-back pin assembly was removed and Emralon lubrication was added. All test and analysis results proved that the floating O-ring concept is feasible. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1976
- Accession Number
- ADA033786
Entities
People
- H. H. Furuike
Organizations
- Aerojet Rocketdyne Holdings