MS90708D
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. UNLESS OTHERWISE SPECIFIED, ISSUES OF REFERENCED DOCUMENTS ARE THOSE IN EFFECT AT THE TIME OF SOLICATION.
4. RECOMMENDED DESIGN LIMITATIONS AND USAGE.
(a) INTENDED USE- TO PROVIDE HIGH CIRCULAR SHOULDERS FOR POSITIONING AND RETAINING MACHINE COMPONENTS ON SHAFTS. THE IDENTICAL SEMI-CIRCULAR HALVES HELD TOGETHER BY THE INTERLOCKING PRONGS FORM A BALLANCED RING CONCENTRIC WITH THE SHAFT, WHICH WILL WITHSTAND HIGH ROTATIONAL SPEEDS. THE USE OF THE FOLLOWING FORMULAS IS BASED ON THE FACT THAT THE MATERIAL 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 - RING HALVES 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) |
.500 |
1.000 |
1.500 |
2.000 |
2.500 |
3.000 |
3.375 |
|
CARBON STEEL AND CORROSION RESISTANT STEEL |
RPM LIMIT |
50,000 |
30,000 |
22,000 |
15,000 |
12,000 |
9,000 |
6,800 |
BERYLLIUM COPPER |
RPM LIMIT |
32,000 |
19,000 |
14,000 |
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(b) ALLOWABLE THRUST LOAD CAPACITY OF THE RINGS. ABUTTING COMPONENTS TO HAVE SHARP CORNERS.
P = ALLOWABLE THRUST LOAD (POUNDS) |
||
S = SHAFT DIAMETER (INCHES) |
||
P = CF πSTX F |
WHERE: |
T = RING THICKNESS (INCHES) X = ULTIMATE SHEAR STRENGTH OF THE RING MATERIAL (P.S.I.) 1/ |
F = FACTOR OF SAFETY, F=3 IS RECOMMENDED TO INSURE A SAFE |
||
WORKING LOAD.
CF = CONVERSION FACTOR, CF = 3/4 IS RECOMMENDED SINCE SHEAR AREA IS REDUCED AT THE CUTOUTS IN THE RING.
1/ X = 150,000 P.S.I. ULTIMATE SHEAR STRENGTH FOR RINGS OF CARBON STEEL OR CORROSION RESISTANT STEEL.
X = 110,000 P.S.I. ULTIMATE SHEAR STRENGTH FOR RINGS OF BERYLLIUM COPPER.
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