M577 Fuze Product Improvement Program: Modified Setting Clutch
Abstract
The objective of this effort was to reduce the cost of manufacturing the M577 fuze by an estimated $.28 each by replacing the existing system of clutch grip rings and spacers with a one-piece clutch sleeve. The one-piece clutch was to achieve the required slipping torque of 9 to 13 in. lb., by varying the clutch's length of engagement on the setting shaft. Several designs of one-piece clutch sleeves were tested, the most significant of which were: 4 fingers or segments (9 tests); 6 segments (29 tests); C-shape with taper (12 tests); solid cylinder with two drive slots (31 tests). Modified setting shafts, having square and tapered shoulders and a few shallow tapers, were tested in various combinations with the sleeves. Most of the designs did not have repeatability of slipping torque for a given sleeve engagement. The one promising design, the solid sleeve on a .143 degree tapered shaft, showed excellent repeatability of slipping torque at a given engagement, and it had a good gradient of torque vs. engagement. However, when installed in a fuze and then turned from zero to maximum time, back and forth repeatedly, the slipping torque gradually increased to a value outside the desired range. There was evidence of increased coefficient of friction in the formation of a dark gray deposit of aluminum oxide. Since none of these one-piece sleeves performed in a completely satisfactory manner, Task 1 was terminated 29 January 1982.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1983
- Accession Number
- ADA139609
Entities
People
- C. Roland
- E. Chesky
- T. W. Perkins