MS16633D
NOTES:
1. UNLESS OTHERWISE SPECIFIED, ALL DIMENSIONS ARE IN INCHES.
2. IN THE EVENT OF A CONFLICT BETWEEN THE TEXT OF THIS STANDARD AND THE REFERENCES CITED HEREIN, THE TEXT OF THIS STANDARD SHALL TAKE PRECEDENCE.
3. RECOMMENDED DESIGN LIMITATIONS AND USAGE.
(a) INTENDED USE- TO PROVIDE UNUSUALLY LARGE SHOULDERS FOR POSITIONING AND MAINTAINING MACHINE COMPONENTS ON SHAFTS. THEY ARE APPLIED RADIALLY AND WITHSTAND CONSIDERABLE THRUST LOAD. THEY ARE OF ADVANTAGE WHERE AXIAL ASSEMBLY OF A RETAINING RING IS NOT POSSIBE AND WHERE FAST ASSEMBLY FOR MASS PRODUCTION LINES IS ESSENTIAL. THE USE OF THE FOLLOWING FORMULAS ARE BASED ON THE FACT THAT THE RING WILL NOT FAIL IN COMPRESSION.
LIMITATION ON USE- THE FOLLOWING FORMULAS ARE NOT TO BE USED FOR BRITTLE MATERIALS SUCH AS CAST IRON, ETC.
WARNING - RINGS SHOULD NOT BE OVER EXPANDED DURING INSTALLATION SINCE THIS WILL LEAD TO RING FAILURE. IF RING HAS PLAY BETWEEN THE GROOVE DIAMETER AND THE INSIDE RING DIAMETER THIS INDICATES THAT THE RING HAS BEEN OVER EXPANDED, (PROVIDING GROOVE HAS BEEN MACHINED TO RECOMMENDED DIMENSIONS).
FOR APPROXIMATE SAFETY RPM LIMITS SEE TABLE V.
TABLE V. APPROXIMATE SAFETY RPM LIMITS.
0 SHAFT(INCHES) |
.250 |
.500 |
1.000 |
|
STEEL |
RPM LIMIT |
25,000 |
14,000 |
8,500 |
BERYLLIUM COPPER |
RPM LIMIT |
16,000 |
9,000 |
4,000 |
(b) ALLOWABLE THRUST LOAD CAPACITY OF THE RINGS. ABUTTING COMPONENTS TO HAVE SHARP CORNERS=
P = ALLOWABLE THRUST LOAD (POUNDS) |
||
P = πSTX 3F |
WHERE: |
S = SHAFT DIAMETER (INCHES) T = RING THICKNESS (INCHES) X = ULTIMATE SHEAR STRENGTH OF THE RING MATERIAL (PSI) 1/ F = FACTOR OF SAFETY |
A SAFETY FACTOR, F= 3, IS RECOMMENDED SINCE THE RING UNDER LOAD IS SUBJECTED NOT ONLY TO PURE
SHEAR STRESSES, BUT ALSO TO BENDING STRESSES.
(c) ALLOWABLE LOAD CAPACITY OF GROOVE WALL
P = ALLOWABLE COMPRESSION LOAD (POUNDS)
P = πGdY |
G = GROOVE DIAMETER (INCHES) |
|
3F |
WHERE: |
d = GROOVE DEPTH (INCHES) Y = YIELD STRENGTH IN COMPRESSION OF THE GROOVE MATERIAL (PSI) F = FACTOR OF SAFETY |
TO INSURE A SAFE WORKING LOAD, A SAFETY FACTOR, F= 2, IS RECOMMENDED. (d) MINIMUM DISTANCE BETWEEN OUTER GROOVE WALL AND END OF SHAFT =
Z= 2d Z = MINIMUM DISTANCE BETWEEN OUTER GROOVE AND END OF SHAFT (INCHES)
WHERE: d = GROOVE DEPTH {INCHES)
1/ X = 100,000 PSI ULTIMATE SHEAR STRENGTH FOR STEEL RINGS .010 AND .015 THICK.
X = 120,000 PSI ULTIMATE SHEAR STRENGTH FOR STEEL RINGS .025 THICH.
X = 150,000 PSI ULTIMATE SHEAR STRENGTH FOR STEEL RINGS OVER .025 THICK.
X = 95,000 PSI ULTIMATE SHEAR STRENGTH FOR BERYLLIUM COPPER RINGS .010 THICK.
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